The college student tied up the stunning tutor in a shameful manner and thoroughly disciplined her until she surrender

Lin Yi, twenty years old, was a computer science student at a prestigious private university in Tokyo. In the second semester of his sophomore year, the professional courses, especially advanced mathematics and algorithm analysis, became incredibly difficult, causing him, a usually bright young man, considerable hardship. His parents, living far away in China, rented him a studio apartment not far from school, granting him freedom but also a sense of loneliness. Lin Yi harbored an extremely secret hobby: Shibari, or Japanese rope bondage. This fascination began in his second year of high school when he accidentally stumbled upon a Shibari video online. In that moment, he was utterly captivated. The screen showed a woman with a graceful figure and fair skin, tightly bound by rough hemp ropes. Her hands were tied behind her back, the ropes around her chest leaving deep impressions. Her mouth was stuffed full with a red gag, saliva uncontrollably dribbling down her chin. Her eyes were hazy, a mixture of shame and an ineffable surrender. That image of complete domination, of helplessness yet a hidden enjoyment, was like a match, igniting the most secret desires within Lin Yi. From then on, he began to voraciously collect all sorts of Shibari resources. Japanese Kinbaku, Kikkō-dori, Tate-dori... his favorites were always those details of "gagged and drooling." Each time he watched videos alone in his apartment, he would dim the lights to the absolute minimum and turn up his headphones to maximum volume, his heart pounding like a drum. He would imagine the bound women were pretty girls he knew, and that intense sense of shame and control would lead to an exceptionally powerful release every time. But he never dared tell anyone. "I'm so perverted... am I sick?" Lin Yi would scold himself after each episode. Yet, the next day, the desire would surge back like a tide. He had even secretly purchased professional cotton ropes, hemp ropes, gags, blindfolds, and vibrating toys online, hiding them in the deepest box under his bed. Those items were like time bombs, constantly reminding him of his inner secret. This day was Wednesday afternoon, and his tutor was coming. Lin Yi's parents had hired a specialized tutor for him – Su Wanning, twenty-eight years old. After completing her master's degree, she had stayed in Japan to teach and worked part-time as a high-end private tutor. She was introduced by a friend of Lin Yi's parents, reputed to have extensive teaching experience and a rigorous approach. When the doorbell rang, Lin Yi's heart inexplicably quickened. He opened the door, and the woman standing before him made him instantly gasp for breath. Su Wanning wore a simple yet figure-hugging white blouse, the collar slightly open to reveal her delicate collarbones. Her lower half was a knee-length black pencil skirt, her long, shapely legs encased in black stockings. High heels made her appear tall and elegant. Her features were exquisite, her eyes possessing an intellectual beauty. Her lips were a natural pink, and her long hair was pulled up, exposing her fair nape. Her figure was even more captivating – a full bust, a slender waist, and rounded, perky hips. She was like a blooming white rose, both dignified and sexy. "Hello, Lin Yi-kun. I am Su Wanning. I'll be tutoring you in advanced mathematics starting today." Her voice was soft yet carried a professional coolness. She smiled slightly, and two faint dimples appeared, making her even more endearing. Lin Yi swallowed and quickly stepped aside. "Teacher Su, please come in." The tutoring session went smoothly. Su Wanning explained things clearly and patiently. But Lin Yi's mind had long since wandered. He watched her body lean forward slightly as she wrote on the problem sheet, glimpsing the cleavage between her blouse buttons, and the way she subtly bit her lip when concentrating... The scenes from those videos were frantically overlapping with the living, breathing, beautiful female teacher before him. "Lin Yi, where are you having trouble with this problem?" Su Wanning looked up, noticing his distraction, and frowned slightly. "N-nothing..." Lin Yi hastily lowered his head. After the tutoring session ended, Su Wanning began packing up to leave. At that moment, Lin Yi, acting on an impulse he couldn't explain, said, "Teacher Su, it's still early. Would you like to have a cup of coffee before you go? I just bought a coffee machine." Su Wanning glanced at the time and hesitated. "Then I'll trouble you." They sat on the living room sofa and chatted. Lin Yi deliberately steered the conversation in a more personal direction, complimenting her on her youth, beauty, and figure. Su Wanning initially responded politely, but later, sensing something was amiss, her expression turned slightly serious. "Lin Yi, I am here to teach, not to listen to such things. If there are no other questions, I will be leaving now." She stood up and reached for her bag when Lin Yi suddenly embraced her from behind. "Teacher Su... I, I really like you..." "Let go! Are you crazy?!" Su Wanning exclaimed, a mixture of shock and anger, struggling desperately. But Lin Yi was young and strong, holding her tightly and pressing her onto the sofa. What happened next felt like a dream, even to Lin Yi himself. He quickly retrieved the ropes he had prepared from under his bed – the tools he had fantasized about countless times. Today, they were finally going to be used on a real person. Su Wanning struggled and cried out, but the apartment was well soundproofed, and Lin Yi covered her mouth with his hand. His movements were clumsy but filled with fervent excitement. In a few swift motions, he tied her hands behind her back. The cotton ropes dug deeply into her fair wrists, crisscrossing and tied securely. "No... Lin Yi, this is a crime! Let me go!" Su Wanning's voice trembled, her eyes filled with fear and shame. Lin Yi panted, his eyes red. He tied up Su Wanning's upper body as well, the ropes wrapping around her full breasts, cinching them into exaggerated shapes. A few blouse buttons popped open, revealing glimpses of black lace lingerie. He then bent her legs into an M-shape and tied them, her skirt completely riding up, exposing her black stockings and the snow-white skin of her inner thighs to the air. Finally, he took out his favorite red gag. "No... mmmph!!!" Su Wanning shook her head violently, tears almost falling. But Lin Yi forcefully shoved the gag into her mouth and secured the strap. At that moment, Su Wanning let out muffled whimpers. Saliva soon began to dribble uncontrollably from the corners of her mouth, dripping down her chin and onto her chest. Her cheeks flushed a deep red, her eyes filled with humiliation and terror, yet also a helplessness born of complete domination. Lin Yi stepped back two paces, gazing at the vivid, living scene before him, almost losing control on the spot. The elegant, dignified, and intellectually beautiful Teacher Su he knew was now bound by him in the most shameful way: hands tied behind her back, breasts contorted by the ropes, legs spread wide, gagged, and drooling... That intense contrast brought him an unprecedented sense of satisfaction and excitement. "Teacher Su... you are truly beautiful..." Lin Yi's voice was hoarse as he took out his phone to start taking pictures and recording videos. The flashlights flickered incessantly, and Su Wanning let out more intense whimpers, writhing desperately, but only causing the ropes to tighten further. Tears of humiliation streamed from the corners of her eyes, but she could not stop any of it from happening. Lin Yi took photos for a good ten minutes, including close-ups and various angles. He even gently touched her tightly bound body with his finger, feeling her tremble with shame. After finishing, he sat in front of Su Wanning, gently wiped the corner of her mouth, his voice low but undeniably commanding: "Teacher Su, I have saved these videos. If you dare tell anyone, including my parents or the school, I will post them on our university's major forums, bulletin boards, as well as your work email and social media accounts... By then, everyone will see you like this – the dignified and beautiful tutor, bound by her student and drooling like a slut." Su Wanning's eyes widened, and she let out a pained whimper, shaking her head desperately. Lin Yi continued, his voice growing softer, yet more dangerous: "You are so beautiful, so elegant... If these videos get out, your life will be ruined. So, from today onwards, you will listen to me. Understand?" The room was filled only with Su Wanning's suppressed whimpers and Lin Yi's heavy breathing. Outside the window, Tokyo's night deepened. This was just the beginning. A university student's long-suppressed dark desires had finally, at this moment, completely opened Pandora's Box. And the beautiful female tutor would, step by step, fall into an inescapable abyss of shame, bound by ropes and threats... As she stood in the center of the living room in nothing but black lace lingerie, black stockings, and high heels, her mature, voluptuous body was fully exposed to the air. Full breasts, a slender waist, rounded hips, long legs… every inch exuded a charm that made Lin Yi's blood surge. "So beautiful..." Lin Yi couldn't help but exclaim. He took out the rope again, his movements a little more practiced than before. This time, he chose the relatively simple Kikkō-tsunagi (tortoise-shell tie). He first wove diamond patterns on Su Wanning's chest and back with the rope, tightly binding her upper body. The rope passed between her breasts, squeezing them even more prominently. Then, he tied her hands behind her back, fixing them in a praying posture. Su Wanning kept her head down the entire time, her face blushing so intensely it felt like it would burn. She could clearly feel every bit of pressure the rope exerted on her skin, and the shivers that ran through her when Lin Yi's fingers occasionally brushed against her sensitive areas. "Teacher, spread your legs a little wider." She hesitated for a long time, but finally, she slightly parted her legs. Lin Yi immediately used the rope to wrap and secure her legs and the roots of her thighs, preventing her from closing them completely, yet not causing too much discomfort. Finally, he took out the red gag again. "No... please..." Su Wanning's voice was laced with pleading. "Just hold it, don't clench too tightly," Lin Yi soothed, but still forcibly shoved the gag into her mouth. The moment the gag was tightened again, Su Wanning let out a muffled whimper. Saliva quickly began to accumulate again, and she desperately tried to swallow, but could only let more liquid spill from the corners of her mouth. Lin Yi stepped back to admire his handiwork. The beautiful teacher in front of him, wearing only lingerie and stockings, was bound in a highly shameful Kikkō-tsunagi pose, her hands tied behind her, her breasts squeezed into unnatural shapes, her legs spread, and drool running down her chin… the intense visual impact almost made him lose control. "Teacher Su, shall we continue our tutoring session now?" Lin Yi suddenly said. Su Wanning's eyes widened, thinking she had misheard. But Lin Yi actually took out the advanced mathematics textbook, sat on the sofa, and patted the seat next to him: "Come here, sit on my lap. Let's finish the content we didn't cover today." Su Wanning let out a series of muffled sounds and shook her head desperately. But Lin Yi just jiggled his phone, and she finally, with a flushed face and the gag in her mouth, shuffled over to Lin Yi's side. Lin Yi pulled her onto his lap and settled her down, her back against his chest. The ropes tightened even more with this position, and Su Wanning's body involuntarily trembled slightly. The next hour became one of the most agonizing times of Su Wanning's life. She was forced to sit on her student's lap, with a gag in her mouth, drooling continuously, her body tightly bound by ropes. Meanwhile, Lin Yi held the textbook in one hand and occasionally let his other hand roam over her body while explaining math problems. Whenever Su Wanning's mind wandered due to shame, Lin Yi would deliberately tighten the ropes or gently pat her constricted breasts, reminding her to concentrate. "Teacher, this is how you solve this problem… Do you understand?" Su Wanning could only manage a muffled "Mm-hmm," tears mixing with her saliva as they fell. She felt utterly debased—a master's degree-holding teacher now reduced to a sex toy, bound by her student for tutoring. Lin Yi's breathing grew heavier. He could clearly smell Su Wanning's faint perfume, feel the heat of her skin flushed with shame, and hear the subtle sounds of the ropes rubbing together with her every slight movement. After the tutoring session ended, Lin Yi finally removed the gag from her mouth. Su Wanning gasped for air, her voice completely hoarse, "Lin Yi… that's enough… today already…" "Not enough yet," Lin Yi said in a low voice. "Teacher, you performed very well today. But I want to take some more photos as proof of our 'agreement'." He had Su Wanning maintain the Kikkō-tsunagi pose and changed into various shameful positions for photos. There were shots of her kneeling on the ground, head bowed in shame; of her bending over with her hips facing backward; and of a simple suspension where she faced the wall, hands raised and secured to it. With each photo taken, Su Wanning's psychological defenses crumbled a little more. When it was all over, Lin Yi finally completely untied her from the ropes. Su Wanning collapsed onto the floor, rope marks all over her body. She hugged her knees, sobbing softly, tears flowing uncontrollably. Lin Yi squatted down, gently wiped away her tears, his voice gentle yet with the tone of a controller: "Teacher, today is just the beginning. Don't worry, I'll take it slow, I won't go too far all at once. But you must remember our agreement. From now on, we'll have tutoring three times a week, and you'll obey me every time. Do you understand?" Su Wanning didn't answer, just nodded slightly. At that moment, she knew she had stepped into an abyss from which there was no return. Outside the window, Tokyo's night was already very deep. Lin Yi looked at the scattered ropes and gag on the floor, and at Su Wanning's disheveled yet still alluring body, a sense of satisfaction he had never felt before surging within him. His rope bondage dreams were finally no longer just fantasies in videos. And the originally aloof and dignified beautiful private tutor would, under his ropes and threats, gradually descend into deeper shame and ruin… Three days had passed since the nightmarish "tutoring session." For those three days, Su Wan Ning had barely slept. Every time she closed her eyes, she was flooded with memories of being tightly bound by ropes, a gag stuffed in her mouth, her saliva uncontrollably dribbling, and Lin Yi's excited eyes as he frantically filmed her with his phone. Though the rope marks had faded, the shame etched into her heart felt like a brand, impossible to erase. She had considered calling the police, quitting her job, even fleeing the city. But each time she reached for her phone and saw the "warning photos" Lin Yi had sent – images of her in a shibari harness, drooling, her eyes filled with humiliation – her courage would crumble instantly. She couldn't afford to gamble. If these photos were ever leaked, her carefully constructed image, career, and future, built over twenty-eight years, would be utterly destroyed. At precisely two o'clock on Saturday afternoon, the doorbell rang. Su Wan Ning stood at the entrance of Lin Yi's apartment, taking a deep breath. She had meticulously dressed herself according to the "requirements" Lin Yi had sent via WeChat three days prior. Her upper body was clad in a white, form-fitting blouse, a black silk scarf tied at the collar, and a light grey OL blazer over it, accentuating her full breasts and slender waist. Her lower half was a black pencil skirt that ended just above the knee, revealing her long, shapely calves. On her legs, she wore a pair of high-end black pantyhose, specifically requested by Lin Yi. They were as thin as cicada wings, yet possessed a subtle sheen. Her heels were black stilettos, a full eight centimeters high, making her appear even taller and more elegant. In the mirror, she was still the same intellectual, beautiful, and distinguished tutor. But only she knew the depth of the humiliating secret hidden beneath this prim OL ensemble. The door opened. Lin Yi, dressed in a simple t-shirt and shorts, had eyes that gleamed with an unnerving intensity. He looked Su Wan Ning up and down, his Adam's apple bobbing. "Teacher Su... you look incredibly beautiful today. This OL black silk look suits you perfectly," he said, his voice laced with undisguised desire. "Come in." Su Wan Ning walked into the apartment with her head down, her cheeks already flushed. She placed the tutoring materials on the table, trying to maintain a shred of dignity. "Lin Yi, we're here for normal tutoring today... you promised you wouldn't go too far." Lin Yi chuckled and pulled out the familiar bundle of cotton rope and a red gag from a drawer, placing them on the coffee table. "Teacher, don't rush into the lesson. I want to try a different approach today. Since you're dressed so formally, let's have a 'formal' tutoring session." He approached Su Wan Ning, reaching out to gently caress her thigh, encased in the silk of her stockings. His voice deepened. "Put your hands behind your back." Su Wan Ning's body visibly trembled. She bit her lower lip, hesitating for a full ten seconds before slowly bringing her hands behind her back. Tears welled in her eyes, but she fought to keep them from falling. Lin Yi's movements were much more practiced than last time. He first tightly crossed and bound Su Wan Ning's wrists, then extended the rope upwards, securing her forearms together. The rope dug deeply into her fair skin, leaving marks at the cuffs of her white blouse. He then moved to her front to begin the chest binding. The coarse cotton rope wrapped around her blouse, cinching her full breasts tightly. The OL blazer was contorted by the ropes, creating deep indentations in the fabric over her chest, the outline of black lace lingerie faintly visible between the shirt buttons. "Mmm... gently..." Su Wan Ning couldn't help but protest in a low voice, her tone laced with evident shame. Lin Yi deliberately tightened the rope, pressing it deeper into her soft breast tissue. "Teacher, you look so incredibly erotic bound like this in your OL attire. Those students who see you normally must have no idea what you're like now, right?" He then extended the rope downwards, wrapping it around Su Wan Ning's waist and hips several times, pulling the pencil skirt taut against her body and perfectly accentuating her rounded buttocks. Next, he had Su Wan Ning sit on the sofa, brought her legs together, and bound them from the base of her thighs to her ankles. The black stockings appeared even more smooth and alluring under the constricting ropes. Finally, he picked up the red gag, the object that filled her with the most dread. "No... don't use this today..." Su Wan Ning's voice was already on the verge of tears. "I'm wearing formal clothes... it's too humiliating..." "Teacher, this is necessary." Lin Yi, with no room for refusal, stuffed the gag into her mouth and secured the strap. The leather strap, wrapped around the back of her meticulously styled hair, looked particularly jarring. "Mmmph...!" The moment the gag filled her mouth, tears immediately welled in Su Wan Ning's eyes. Before long, glistening saliva began to spill from the corners of her mouth, dripping down her chin and onto the collar of her snow-white blouse, leaving damp marks. Lin Yi stepped back two paces and took out his phone, snapping photos from various angles. "Teacher, look up at the camera... yes, just like that. A beautiful teacher in OL black silk, bound and drooling... perfect." Su Wan Ning let out suppressed whimpers, her body wriggling slightly, but the ropes only tightened, bringing a wave of numb, hot, strange sensations. The black stockings showed faint imprints from the ropes, and her high heels, unable to be placed together due to her bound legs, caused the hem of her skirt to ride up slightly, revealing more of her fair upper thigh skin. After taking the photos, Lin Yi sat down on the sofa and spread out the textbooks. "Now, let's begin the tutoring. Teacher, come sit on my lap, just like last time." Su Wan Ning shook her head desperately, emitting strong "Mmmph! Mmmph!" protests. But Lin Yi merely dangled his phone, and she finally, with a flushed face, gag in her mouth, and body tightly bound by ropes, shuffled her way towards him. Lin Yi pulled her onto his lap, positioning her to sit sideways in his embrace. Su Wan Ning's buttocks pressed firmly against Lin Yi's body. Due to the binding, her upper body leaned slightly forward, her breasts pushed even more prominently by the ropes, almost touching Lin Yi's chest. The next two hours became Su Wan Ning's most agonizing tutoring session. She was forced to lecture on advanced mathematics in this extremely humiliating posture. With the gag in her mouth, she couldn't form complete sentences, only emitting muffled "Mmm" sounds. Whenever she tried to explain a key point, saliva would uncontrollably dribble from her mouth, onto the textbooks, and onto her own snow-white blouse. Lin Yi held a pen in one hand, recording notes, while his other hand roamed restlessly over her body. Sometimes he would gently tug on the ropes, causing them to rub against her sensitive areas; sometimes he would caress her tightly bound thighs through the black silk stockings; and sometimes he would even reach inside her blazer and knead her rope-cinched breasts through her blouse. "Teacher, you're explaining this incorrectly... explain it again." Su Wan Ning's eyes were teary, but she had no choice but to endure the extreme shame and try to explain, gagged as she was. Every slight movement of her body caused the ropes to emit a faint rustling sound, and it also made her acutely aware of her current identity – an OL teacher turned plaything, bound by her student. Su Wanning’s lips trembled, and tears welled up in her eyes. But she knew the consequences of resisting, so she could only slowly turn around and put her hands behind her back. Lin Yi’s movements were becoming increasingly skilled. First, he tightly crossed and bound Su Wanning’s wrists together, then brought her forearms together and secured them with rope, wrapping it layer by layer. Next, he had Su Wanning kneel on the living room carpet and began binding her upper body. The rope was looped over her shirt, tightening firmly around her full breasts. Her suit and shirt were squeezed out of shape, the fabric across her chest deeply indented, outlining an exaggerated silhouette. “Ugh… it hurts…” Su Wanning protested softly. Lin Yi, however, deliberately tightened the rope: “Teacher, bear with it. I’m going to tie you up extra tight today.” He continued downward, wrapping the rope around Su Wanning’s waist and hips, pulling her body-hugging skirt tightly against her body. Next, he bent Su Wanning’s legs behind her back and tied her ankles to her wrists—this was the classic hogtie (hogtie). Su Wanning’s upper body was forced to arch backward, her chest thrust high, her legs pulled behind her, her ankles and wrists almost touching. Her entire body was stretched into an extremely humiliating arch by the ropes. “No… this is too uncomfortable… Lin Yi, please…” Su Wanning’s voice was already choked with tears. The hogtie left her completely immobilized; she could only kneel face-down on the ground like a bound prey, her hips slightly raised, the curves of her thighs and buttocks—enveloped in black stockings—fully exposed. But Lin Yi didn’t stop. He wrapped a few extra loops of rope around the base of Su Wanning’s thighs, further restricting her movement. Finally, he picked up the red gag she feared most. “Open your mouth.” “Mmm… don’t put it in…” Su Wanning shook her head frantically, but Lin Yi still forced the gag into her mouth and tightened the strap. The leather strap dug deeply into both sides of her cheeks. The moment the gag filled her mouth, saliva began to pool rapidly. Before long, it was spilling uncontrollably from both corners of Su Wanning’s mouth, dripping down her chin onto the carpet. Lin Yi looked at his handiwork with satisfaction. The stunning private tutor before him was bound in a complete “four-horse” position: her hands and feet tightly bound together behind her back, her upper body forced into an arch, her chest thrust high, her body-hugging skirt hiked up to her waist, her thighs in black stockings fully exposed, a red gag stuffed in her mouth, and saliva dripping incessantly… That intense visual contrast made his blood boil. “Teacher, you look… absolutely perfect like this,” Lin Yi murmured in admiration. He bent down, lifted Su Wanning into his arms, and placed her on the large desk in the center of the living room. The desk was spacious enough; he positioned Su Wanning on her side, facing the desk chair—the very spot where he would be sitting shortly. Su Wanning’s head was tilted slightly to the side, her eyes level with the textbooks and computer on the desk, while her body was completely secured to the desk with ropes, unable to move even an inch. The “Four-Horse Bind” forced her body into an extremely arched, humiliating curve; her breasts were so compressed they seemed ready to burst through her shirt, and her buttocks and thighs, encased in black stockings, trembled slightly on the tabletop, saliva trickled down the corner of her mouth, forming a small puddle on the desk. Lin Yi pulled up a chair, sat directly in front of Su Wanning, opened his laptop and textbooks, and began studying earnestly. “Teacher, just watch me study right here,” he said, flipping through his book while reaching out to gently pat Su Wanning’s tightly bound cheek. “That’s the only way I’ll stay motivated.” Su Wanning let out a series of choked whimpers as tears mixed with saliva streamed down her face. She wanted to beg for mercy, to struggle, but the four-horse bind left her almost completely immobilized; all she could do was emit muffled whimpers. Every slight twist of her body caused the ropes to dig deeper into her flesh, bringing a complex sensation of pain and numbness. The next two and a half hours became the longest and most humiliating period of Su Wanning’s life. She was laid bare on the desk, like a living ornament, forced to watch Lin Yi study intently. From time to time, Lin Yi would glance up at her before returning to taking notes. Sometimes he would reach over and, through her clothes, knead her breasts—tightened by the ropes—or stroke the sensitive areas on the inner thighs of her black stockings. “Teacher, you’re drooling so much… it’s dripping onto the desk.” Lin Yi dipped his finger in the drool at the corner of her mouth, waved it in front of her eyes, and said, “You look completely different now from the way you usually stand at the lectern teaching. I never would have thought that a dignified, beautiful teacher would be so lewd after being tied up like this.” Su Wanning’s tears flowed uncontrollably. She felt her dignity being crushed bit by bit. With a ball gag in her mouth, she couldn’t speak and could only emit muffled whimpers. Every time she tried to adjust her position, the ropes would emit a faint rustling sound, accompanied by an even stronger sensation of restraint. Lin Yi’s study efficiency seemed remarkably high. While studying advanced mathematics and algorithms on his own, he would occasionally speak to Su Wanning “on the desk.” “Teacher, I don’t know how to solve this problem. Teach me.” He deliberately held the textbook right in front of Su Wanning’s eyes. Su Wanning could only make muffled sounds through the ball gag, struggling to signal the answer with her eyes and nods. As a result, more saliva flowed, dripping down her chin onto her chest, soaking a large patch of her white blouse and faintly revealing the outline of her black lace lingerie. Second by second, time passed. Su Wanning’s body was beginning to go numb and her muscles ached from maintaining the “four-horse” position for so long, but what tormented her most was the psychological humiliation. Here she was—a twenty-eight-year-old female teacher with a master’s degree and an elegant demeanor—yet now she was bound by her own student into the most degrading position, displayed on the desk like a “decorative piece,” forced to watch him study while drooling incessantly. Lin Yi would occasionally stand up to take photos and record videos of her from different angles. “Teacher, look at the camera… That’s it, exactly that look. A black-stockinged office lady tied in the ‘four-horse’ position, drooling—it’s fantastic. We’ll have to save these photos carefully as proof of our agreement.” With every flash of the camera, Su Wanning’s psychological defenses crumbled a little more. Two and a half hours later, Lin Yi finally closed his book. He stood up, walked over to the desk, and gently stroked Su Wanning’s cheeks, which had turned bright red from the ropes. “Teacher, I’ve made great progress studying with you today.” His voice was gentle, yet tinged with the satisfaction of a dominator. “As a reward, I’ll remove your gag first.” The moment the gag was removed, Su Wanning coughed violently, gasping for air as long strands of saliva stretched from her mouth. Her voice hoarse and choked with tears, she pleaded: “Lin Yi… please… untie me… I can’t take it anymore… my body hurts so much…” Lin Yi, however, did not immediately untie the four-horse bind; instead, he made her remain in that position while he took dozens more photos. These included her chest, damp with saliva; her black-stockinged thighs, marked with deep red welts from the ropes; and her profile—streaked with tears yet still strikingly beautiful. “Teacher, don’t worry—I won’t keep you like this forever,” Lin Yi said as he untied the ropes. “But you must remember: as long as you obey me, these videos won’t be leaked. “For our next tutoring session, I want you to come wearing a spaghetti-strap top, black stockings, and high heels… And I’d also like to try some more complex bondage techniques.” Su Wanning slumped limply on the desk, her body covered in deep rope marks. Hugging her knees, she sobbed softly but could only nod slightly. She knew she was sinking deeper and deeper into this abyss woven from ropes, threats, and shame. The once proud and dignified female teacher was, step by step, under Lin Yi’s training, heading toward complete ruin. On top, she wore a standard white sailor-style short-sleeved shirt with a dark blue neckerchief tied around the collar; the fabric billowed slightly across her chest, highlighting her mature, voluptuous curves. Below, she wore a dark blue pleated skirt that fell just past the middle of her thighs, revealing a generous expanse of snow-white skin. On her legs were the white hold-up stockings Lin Yi had specifically requested—thin and silky, with a girlish, innocent sheen that stood in stark contrast to her mature, twenty-eight-year-old figure. Her feet were shod in a pair of white leather pumps, and her entire appearance exuded both youthfulness and a forbidden allure. Su Wanning kept her head down, her cheeks already burning bright red. She felt more like a student forced into a cosplay outfit than a dignified private tutor. When the door opened, Lin Yi’s eyes lit up instantly, and his breathing grew heavy. “Ms. Su… this schoolgirl outfit with white stockings is simply perfect. ” He scanned her from head to toe with a burning gaze. “You look both innocent and seductive—completely different from your usual office lady image. Come in.” Su Wanning bit her lower lip as she stepped into the room, her heart pounding like a drum. She knew she was about to face yet another humiliation today. “Today… how are we going to play?” Her voice was barely audible, and she hardly dared to look up. Lin Yi took out some cotton rope and a red gag, walked up behind her, and said in a low, excited voice: “Put your hands behind your back first. Today, I’m going to use an authentic Japanese-style rear-hand bind.” Su Wanning didn’t put up much resistance and slowly brought her hands behind her back. Lin Yi’s hands moved with practiced skill. First, he tightly crossed and bound her wrists, then extended the rope upward, pressing her arms together tightly behind her back. This Japanese-style rear-hand binding forced her shoulders back, causing her chest to naturally arch forward, and the fabric of her sailor uniform stretched taut. The rope dug deeply into her fair, delicate skin, winding above and below her chest to form a simple tortoiseshell pattern. The rope passed between her breasts, squeezing her full chest so it stood out even more; the sailor uniform’s collar was pulled out of shape, faintly revealing the edge of the black lace lingerie beneath. “Mmm… it’s so tight…” Su Wanning couldn’t help but let out a low moan. Lin Yi continued downward, binding her legs together and wrapping the rope from the base of her thighs all the way down to her ankles in layer upon layer of cross-legged restraints. The rope left deep indentations on her white stockings, and the smooth silk surface reflected a shameful sheen under the light. Her pleated skirt had curled up slightly due to her bound legs, revealing more of the snow-white skin at the top of her thighs. Finally, he picked up the red gag. “Open your mouth, Teacher.” With tears welling in the corners of her eyes, Su Wanning parted her lips slightly. The gag was forced into her mouth; once the leather strap was fastened, saliva soon began to spill uncontrollably from the corners of her mouth, dripping down her chin onto the collar of her white sailor uniform and leaving a wet trail. Lin Yi took two steps back, savoring the stark contrast of the scene before him. A stunning twenty-eight-year-old private tutor, dressed in a student JK uniform and white stockings, was firmly restrained by a Japanese-style behind-the-back bondage with her legs bound together: Her hands were tied behind her back, her chest thrust high, her short skirt stretched out of shape, her legs tightly pressed together in white stockings, a gag stuffed in her mouth, and clear saliva trickling from her lips… The stark contrast between the “innocent schoolgirl” and the “bound plaything” nearly drove him wild. “Teacher, the way you look tied up in that JK uniform and white stockings… it’s really too much,” Lin Yi said hoarsely. He sat down on the sofa, lifted Su Wanning into his arms, and had her sit sideways in his lap. Unable to resist due to the ropes, Su Wanning’s body could only lean limply against his chest. Her hips pressed tightly against Lin Yi’s thighs, her white-stockinged legs—bound together—rested on his lap, and her little white leather shoes dangled in the air, swaying gently. Lin Yi supported her back with one hand while his other hand boldly cupped her breasts, which were tightly constricted by the ropes. Through the thin sailor uniform, he began to slowly knead them. “Mmm…!” Su Wanning’s body shuddered violently, and she let out a choked moan. She wanted to struggle, but the ropes restricted her to only the slightest twists. This made her feel the pressure of the ropes and the warmth of Lin Yi’s palm even more keenly. Lin Yi’s hand firmly kneaded the full, soft flesh; with each movement, the ropes dug deeper into her skin, compressing her breasts even more dramatically. The fabric of her white sailor uniform was crumpled from the kneading, and drool kept dripping down, soaking a large patch of her collar. “Teacher, your breasts are so soft… With the rope tightening around them, it feels especially intense to touch them through your sailor uniform.” ” Lin Yi whispered into her ear, “Doesn’t it feel especially shameful to be dressed like this, held in my arms while I grope you?” Su Wanning’s tears kept streaming down, mixing with her saliva as they dripped onto the back of Lin Yi’s hand. She felt as though she had completely fallen from grace—a mature female teacher, yet forced to wear a student’s white JK uniform and stockings, held in a student’s arms while he freely groped her breasts. But as time passed, amidst the extreme humiliation, her body gradually began to react in an unusual way. The tight binding of the ropes had greatly heightened her sensitivity throughout her body; every stimulation from Lin Yi’s kneading traveled through the ropes to every part of her. A faint heat rose in her lower abdomen, and a tingling sensation unlike anything she’d ever experienced made her tremble involuntarily. “No… I can’t feel this way…” she desperately denied in her mind. But when Lin Yi’s fingers found her sensitive spot and pressed gently through her clothes, that tingling sensation intensified instantly, nearly causing her to let out a sound other than a muffled whimper. …It actually… felt pretty good. The moment that thought crossed her mind, Su Wanning felt even more desperate and confused. She hated herself—how could she, while being coerced and toyed with, feel a pleasurable flutter at this humiliating restraint and manipulation? It made her feel as though she were truly on the verge of complete moral ruin. Lin Yi seemed to sense the subtle changes in her body, and his movements became gentler and more prolonged. One hand continued to massage her breasts, while the other slowly traced the curve of her thigh, clad in white stockings, savoring the unique sensation of the stockings being tightly constricted by the rope. Forty minutes later, Lin Yi finally removed the ball gag from her mouth. A flood of saliva poured out as Su Wanning gasped heavily, her eyes brimming with tears: “Lin Yi… that’s enough… Let me go…” But Lin Yi still held her close, not immediately untying the ropes. Instead, he gently stroked her back and whispered: “Teacher, I’m very pleased with how you look in that school uniform and white stockings today. I can feel your body getting hot… Did it feel a little good?” Su Wanning shook her head violently, her voice choked with tears: “No… I don’t feel that way! Don’t say such nonsense!” But her tone clearly betrayed her guilt. Lin Yi didn’t press her further; he simply took a few more photos of her in his arms, still bound by the ropes, before slowly untying her. As the ropes were removed, deep red marks remained on Su Wanning’s body. She slumped onto the sofa, arms crossed over her chest, and sobbed softly. Her chest still felt faintly warm, and the lingering tingling sensation, combined with the feeling of her legs being tightly constricted by the white stockings, left her feeling utterly confused. “Teacher, next time I want you to wear a school uniform again.” Lin Yi crouched in front of her, speaking gently yet firmly. “Remember our agreement. The better you behave, the safer these videos will be.” Su Wanning didn’t answer; she merely nodded slightly. She knew her will was being worn down bit by bit. And today, during the Japanese-style rear-hand binding and while her breasts were being caressed in his arms, that fleeting thought—which shouldn’t have been there—that “it actually felt pretty good” had already taken root in her heart. "Teacher, you're finally starting to cooperate with me. I'm very pleased." Without further ado, he took out the cotton ropes he had prepared. This time, he wanted to try a binding method that tested flexibility more – the straight-arm bind. "Teacher, put your hands behind your back and bring them together straight." Su Wanning didn't hesitate. She turned around and placed her arms straight behind her back. She usually practiced yoga and Pilates, so her body was extremely flexible. When her arms were brought together behind her, her wrists could almost touch easily, and her shoulder joints felt no discomfort at all. A flicker of surprise flashed in Lin Yi's eyes. He first used the rope to tightly bind Su Wanning's wrists together in a cross. Then, he moved upwards, binding her arms together from wrists to upper arms. The ropes wound layer by layer, pressing her two fair arms tightly together, forming a standard straight-arm reverse bind. Su Wanning's breasts became more prominent as her arms were pulled straight back. Her white shirt was stretched taut, faintly revealing the outline of her bra. "Teacher, your flexibility is truly excellent," Lin Yi praised as he bound her. "Most people find the straight-arm bind very strenuous, but you're so relaxed. Your arms are so straight, and the ropes are tied beautifully." Su Wanning bit her lower lip, remaining silent. She could clearly feel the pressure of the ropes digging deeply into the skin of her arms. Her arms were completely immobilized, yet there wasn't an unbearable pulling sensation. Instead, there was a strange sense of fullness from being completely restrained. Lin Yi continued to create a simple tortoise shell pattern on her upper body, winding the ropes above and below her breasts, shaping them enticingly. Then, he had Su Wanning sit on the wooden dining chair in the living room. "Sit still, don't move." He spread Su Wanning's legs apart and tied them separately to the chair legs on either side. Her thighs, encased in black stockings, were tightly secured by the ropes. Her short skirt shifted slightly due to her sitting posture, revealing more of her fair upper thighs. Finally, he used the ropes to bind her upper body to the back of the chair, ensuring she couldn't stand up at all. The straight-arm bind combined with the chair restraint gave Su Wanning a posture that was both dignified and extremely helpless. Her hands were bound straight behind her back, her breasts pushed high, her legs spread apart and secured under her short skirt, unable to be brought together as she sat on the chair. Notably, Lin Yi did not use a gag or tape this time. "Teacher, today we're really going to have a make-up lesson," Lin Yi said, pulling over another chair and sitting opposite Su Wanning. He spread out the advanced mathematics textbook. "I have an important exam next week. Please explain these chapters to me thoroughly." Su Wanning adjusted her sitting posture slightly, the ropes emitting a faint rustling sound with the movement. Her cheeks were still flushed, but she tried to maintain her teacher's demeanor: "...Alright. This chapter is about partial derivatives of multivariable functions... Look at the problems first." Despite her hands being bound straight behind her back and her body securely tied to the chair, Su Wanning began her explanation earnestly. Her voice was soft and clear, with only occasional soft intakes of breath caused by the tightening ropes. Lin Yi listened and took notes with a pen. He would occasionally look up at Su Wanning, his gaze drifting between her rope-tightened breasts, her thighs encased in the short skirt, and the curves of her body made more prominent by the straight-arm bind. Halfway through the explanation, Lin Yi suddenly reached out and gently pressed her rope-tightened breast through her shirt. "Mmm..." Su Wanning trembled, her voice faltering. "Lin Yi... you said we were going to study seriously..." "I am studying seriously," Lin Yi said with a smile, his hand not moving away. Instead, he gently kneaded it twice. "Teacher, the way you look lecturing while tied to a chair is really motivating. Especially this short skirt; it's almost riding up when you sit." Su Wanning's face turned a shade of red that was almost bleeding. She tried to bring her legs together, but the ropes tied to the chair legs held them firmly, allowing the skirt to continue riding up. For the next hour and a half, Su Wanning diligently tutored Lin Yi in this shameful posture, bound to the chair with a straight-arm bind. Each time she leaned forward to explain, the ropes would dig deeper into her skin, bringing waves of peculiar pressure. Lin Yi, meanwhile, would occasionally reach out to caress her thighs or knead her breasts as "rewards." Strangely, Su Wanning found herself not resisting as strongly as before. Perhaps it was because her mouth wasn't gagged, allowing her to speak normally; perhaps it was because she had chosen this outfit herself today; or perhaps it was because the straight-arm bind didn't cause her too much pain due to her flexible body, instead giving her a peculiar sense of being completely controlled yet safe. When one chapter was finished, Su Wanning panted slightly and said in a low voice: "...Lin Yi, being tied up in this outfit... does feel a little better than before. At least it doesn't hurt too much." Lin Yi looked at her, bound to the chair, her short skirt disheveled, her cheeks flushed, and a smile curved his lips. "Teacher, you're finally admitting it. Then shall we continue with this outfit next time, alright?" Su Wanning didn't answer immediately, just lowered her head slightly. Shame still filled her heart, but the strong sense of resistance she once felt seemed to be slowly replaced by a more complex emotion. Su Wanning leaned back against the chair, her body feeling weak and limp. Although the straight-arm restraint had been released by Lin Yi, deep red marks still lingered on her arms. She looked down, tidying her rumpled white shirt and the short, dark blue skirt rolled up to her waist, her cheeks still flushed. Her legs, encased in black stockings, were pressed together slightly. The sensation of being spread apart and fixed to the chair legs for so long still felt strange. "Teacher, you've worked hard today," Lin Yi said, standing before her. His voice was gentle, yet tinged with an undisguised excitement. "Your reaction when I suddenly cupped your breasts was incredibly cute." Su Wanning bit her lip, not looking up. Her mind was a jumble of emotions – shame at her own gradual surrender, yet an undeniable awareness of the illicit sensations her body had produced under the bondage and stimulation. Just as she was about to say, "That's all for today," Lin Yi took out an exquisite black box from a nearby drawer. "Teacher, I bought a new toy online a couple of days ago. I want you to try it today." Su Wanning looked up, and her face instantly changed when she saw what Lin Yi had taken from the box. It was a silver metal gag, with a large circular ring in the center, connected to multiple adjustable leather straps and buckles. Its design was utterly wicked – once worn, it would not only force the mouth open and hold it in an "O" shape, but also make it impossible for the wearer to close their lips, causing saliva to flow uncontrollably. "Is this... a forced-open gag?" Su Wanning's voice trembled noticeably. "Lin Yi... no... this looks too terrifying..." Lin Yi walked behind her, gently placing his hands on her shoulders. He whispered soothingly, "Teacher, you've been very cooperative today, just try this. I promise it won't be for long. And... didn't you say earlier that the short skirt felt better when you were tied up? I want to see what you look like with this on." Su Wanning hesitated for a long time, but ultimately did not resist strongly. She knew that resistance would only lead Lin Yi to threaten her with the videos. She slowly turned around, her hands placed behind her back again. Lin Yi first used rope to re-apply a simple straight-arm restraint, binding her arms together behind her back. Then, he had her sit on the same chair and re-secured her upper body to the backrest and her legs to the chair legs with rope. Once everything was in place, Lin Yi approached her with the gag, its metal glinting coldly. "Open your mouth, Teacher." Tears welled in Su Wanning's eyes. With a sense of humiliation, she slowly parted her lips. Lin Yi carefully but firmly inserted the metal ring into her mouth. The ring settled perfectly between her upper and lower teeth, forcing her mouth into a perfect, rounded "O" shape. He then brought the leather straps around to the back of her head and buckled them one by one, ensuring the gag was completely secure and could not be removed. "Mmm... mmmph..." Su Wanning immediately let out muffled, guttural sounds. With her mouth forced open, she couldn't close her lips at all, her tongue and mouth completely exposed to the air. Within seconds, clear saliva began to dribble uncontrollably from the corners of her mouth and through the ring, dripping down her chin and onto the collar of her pristine white shirt. Lin Yi stepped back a couple of paces, admiring the intensely impactful scene before him. The beautiful private tutor, bound to the chair in a straight-arm restraint, wearing a short skirt and black stockings, her mouth forced wide open by the gag, saliva flowing incessantly, her eyes filled with shame and helplessness... the stark contrast made his breathing grow heavy. "Teacher, you look so incredibly erotic like this," Lin Yi said, stepping forward. He gently wiped the saliva from the corner of her mouth with his finger, deliberately drawing out longer strands. "You're drooling so much, you can't stop." Su Wanning let out a series of desperate "Mmmph, mmmph, mmmph" sounds, tears streaming down her cheeks. She tried to shake her head, but her movements were restricted by the gag and the restraints. She could only let the saliva continue to drip, wetting her entire shirt front. The clear liquid spread down the fabric, even dripping onto her thighs, clad in black stockings. Lin Yi sat opposite her, took out his phone, and snapped a few pictures. Then, he reached out and cupped her breasts again, which were tightly bound by the rope, and began to knead them slowly. "Teacher, don't be nervous. Just stay like this with me for a while," he whispered as he massaged her. "See, the more you drool, the more transparent your clothes become... that way, I can see your body more clearly." Su Wanning's whimpers grew more rapid. The forced-open gag rendered her completely speechless, able to emit only muffled nasal sounds of pleading. The uncontrollable flow of saliva brought on an unprecedented sense of shame – she felt like a mere plaything, unable to conceal her utter disarray. Yet, strangely, amidst the extreme humiliation, the sensation of her mouth being forced open, the loss of control over her saliva, and her body being tightly bound by ropes, once again sent a faint warmth surging from the depths of her body. Lin Yi seemed to sense her change, his touch becoming gentler and more sustained. As he massaged her breasts, he lightly stroked the inside of her thighs, covered by the black stockings. "Teacher, you chose to wear a short skirt today, and you're so obediently letting me put on this gag... I'm truly happy," Lin Yi whispered close to her ear. "Once you get used to this gag, we can play for longer periods in the future." Su Wanning's tears continued to flow. She couldn't reply, only letting out suppressed whimpers. The saliva had completely soaked her chin, neck, and chest, her shirt clinging tightly to her skin, outlining alluring curves. Lin Yi kept her bound to the chair like this, wearing the forced-open gag, playing with her for nearly twenty minutes before finally unbuckling the gag. The moment the gag was removed, Su Wanning gasped for air, long strands of saliva trailing from her mouth. Her voice was hoarse, choked with tears as she pleaded, "Lin Yi... this gag... it's too shameful... I beg you... please don't use it again next time, okay?... I really can't stand it... the saliva keeps flowing... I can't say anything at all..." Lin Yi gently wiped the tears and saliva from her face, and softly kissed her forehead. "Teacher, you behaved very well today. I'll consider it. But... I think you look particularly beautiful when you wear it." Su Wanning lowered her head, not speaking further. A lingering numbness from the gag remained, along with the residual warmth on her chest and thighs from his touch. Her inner turmoil grew increasingly chaotic – shame, humiliation, and that increasingly hard-to-ignore, strange sensation intertwined, leaving her unsure how much longer she could endure. The white short-sleeved sailor uniform was replaced with a deep black version, a black ribbon tied at the collar, her ample curves stretching the fabric taut. The lower half was a matching black pleated mini-skirt, the hem falling to mid-thigh. On her legs were the black garter stockings Lin Yi had specifically requested, thin and lustrous, and on her feet, a pair of small black leather shoes. The entire ensemble exuded a youthful innocence tinged with the forbidden allure of a mature woman. Su Wanning stood at the apartment door, taking several deep breaths before pressing the doorbell. She knew that arriving dressed like this was increasingly starting to look like active cooperation. The door opened, and Lin Yi's eyes lit up when he saw her attire. "Teacher... black JK, black stockings, you look absolutely stunning. Come in." Su Wanning walked into the room with her head down, her voice barely a whisper, "...You said you wanted to see this color, so I wore it. Today... how do you want to be tied?" Lin Yi didn't answer immediately. He first had Su Wanning stand in the center of the living room, took out ropes, and began a meticulous binding. He started by binding Su Wanning's hands straight behind her back, the ropes wrapping layer upon layer, tightly securing her supple arms together. Then, he wove a Kote-kote-koba on her upper body. The black ropes formed a stark contrast against the dark JK uniform, constricting her full breasts and causing the sailor uniform's fabric to deeply He first crossed her wrists, left over right, and wrapped them with cotton rope. The rope rubbed against her skin, making a rustling sound. He wrapped quickly, one loop, two loops, three loops, then threaded through the loop and pulled tight with a jerk. Su Wanning's wrists were fixed at a stiff angle, her forearms pressed together, her elbows touching. Next came the straight-arm bind. The rough texture of the hemp rope scraped against the tender skin of her inner forearms, each loop digging into her flesh. He wrapped it tightly, from her wrists all the way to above her elbows, binding her arms into a straight line, unable to bend or separate. Su Wanning bit her lip, making no sound. But her breathing grew heavy. Lin Yi moved to her front and began the Kikkō-tsuna. The rope passed under her armpits, crossed behind her back, then wrapped around her chest, threading through the cleavage between her breasts. He pulled it tight, the rope sinking deep into her soft flesh, squeezing the cleavage even deeper. The fabric of her black camisole was stretched and distorted, a strap slipping off one shoulder, revealing her snow-white skin. "Mmm..." Su Wanning finally let out a soft sigh. Lin Yi looked up at her. His gaze was dark, his fingers tracing the path of the rope lightly across her chest. "Don't move." He continued to weave. Diamond patterns gradually formed on her chest and back. The black ropes blended almost seamlessly with her black clothing, only the indentations and bulges proving their presence. With each tightening, Su Wanning's breasts were pushed upwards, making it difficult to breathe, yet she had to gasp for air. After binding her upper body, he had her kneel. The carpet was soft, and as Su Wanning knelt, her fluffy skirt completely rolled up, piling around her waist. Large swathes of her thighs were exposed, the edge of her stockings leaving a distinct line, white flesh above and black sheer fabric below. Lin Yi began to bind her legs. He first brought her knees together and secured them with rope, then started from her upper thighs, wrapping downwards in loops. He didn't avoid the stockings; the rope wrapped directly over them, the black rope intertwining with the black stockings, creating clear indentations. Su Wanning could feel the pressure intensifying. The rope dug deeply into the stockings, pressing the thin fabric into her skin. Her legs were fixed in a straight, together position, knees touching, ankles touching. Finally, Lin Yi took out a long rope, gently pulled her upper body forward, and connected the knot of the chest bind to the rope near her knees. This connection forced her into a bowed-down kneeling posture, her back arched, her buttocks raised, her head almost touching her knees. The entire binding process took twenty minutes. There were no extra questions, only the sound of ropes rubbing against skin and his occasional breaths as he adjusted angles. When the last rope was tied, Su Wanning was completely immobile. She knelt there, her hands bound straight behind her back, the Kikkō-tsuna rope tightly constricting her chest, her black mini devil skirt messily rolled up at her waist, her black-stockinged legs fixed together, her cat ears swaying gently with her rapid breaths. She tried to struggle, but the ropes didn't budge. The restraint was airtight; she could even feel the tightness as her chest rose and fell with each heartbeat. Lin Yi stepped back a few paces and looked at her for a long time. His gaze roamed over her, from her chest deformed by the rope, to her arched back, to her joined legs. The light cast his shadow upon her, large, completely engulfing her. "Perfect," he said. He turned and took a box from a drawer. Black, palm-sized. He opened it to reveal a leather collar, inlaid with two metal electrodes and a small receiver in the center. "Coyote shock collar," he said, holding the collar in his hand, the leather bending between his fingers. "Bought it specifically for you." Su Wanning's pupils contracted. She watched Lin Yi walk behind her, his hands reaching around her neck. The coolness of the leather touched the sensitive skin of her neck, where her pulse beat. The clasp clicked shut, locking. The metal electrodes pressed firmly against her carotid artery, cold and hard, like two eyes staring at her. Lin Yi picked up the remote control and crouched in front of her. He looked at her, his eyes deep. "Teacher, you'll wear this today." Su Wanning bit her lip, tears already welling in her eyes. She wanted to shake her head, but the collar tightened around her neck, restricting her movement. In the end, she simply closed her eyes gently, a silent acquiescence. Lin Yi pressed the lowest setting. A current instantly coursed through the collar, striking her neck. It was a strange, itchy sensation, not pain, but a deep, bone-chilling tremor, as if countless ants were biting simultaneously beneath her skin. "Ah!" Su Wanning's body jolted violently, her head thrown back, her neck forming an arc. Her cat ears twitched wildly, their tips almost touching. Lin Yi didn't stop. He turned the dial higher, and at the same time, reached out and kneaded her chest, which was tightly bound by the Kikkō-tsuna, through her black top. The ropes were deeply embedded in her flesh, and his fingers could trace the path of each rope, pressing and kneading along those indentations. "Zzzzz—" A medium-intensity shock struck. A sharp sting and numbness erupted simultaneously, Su Wanning's body arched violently, and a scream burst from her throat. "Ah... Ah!!" Tears streamed down her face, saliva dripped from the corner of her mouth, falling into her deep cleavage. Her black devil mini-skirt swayed with her violent struggles, her black-stockinged legs spasmed, and her toes curled inside her high heels. Lin Yi watched her, his fingers roaming her chest, occasionally pressing the remote. Each shock landed precisely at her most vulnerable moment. "Please... turn it off..." Su Wanning cried, her voice slurred. Lin Yi just smiled. He loosened some of the ropes on her legs, forcing her to spread her knees, then reached under her skirt. Through the stockings, he could feel the warmth and moisture there. "Teacher, you're wet." Su Wanning's face instantly burned, shame almost drowning her. But the next second, the current struck again, tearing her consciousness to shreds, leaving only instinctual screams and tremors. The electric shocks lasted for twenty-five minutes. When Lin Yi finally turned off the remote, Su Wanning had gone soft like a puddle. He untied the rope connecting her chest to her knees, allowing her to straighten her upper body, but she had no strength and could only collapse into his arms, gasping for air. Her face was covered in tears and saliva, her cat ears askew, her hair disheveled. Her black mini devil outfit was almost completely undone, the camisole strap slipping, revealing shoulders covered in red marks, her skirt rolled up to her waist, and deep indentations on her knees from the stockings. The breasts, deformed and slightly reddened by the ropes, the legs bound together and tightened, down to her slightly parted lips, still glistening with moisture. "Teacher," his voice was kept very low, as if afraid of waking something, "the night is beautiful tonight... I want to take you to the rooftop." Su Wanning's face instantly turned ashen. It wasn't the blush of shyness, but the deathly pallor after her blood had instantly receded. She knelt there, her body still maintaining the stiff posture from being bound, shaking her head desperately. The cat-ear headband was long gone, and her disheveled hair clung to her sweaty cheeks. "Lin Yi..." her voice was choked with tears, hoarse to the point of being unrecognizable, "Don't... the rooftop is too dangerous... what if someone comes up... I beg you..." The image involuntarily flashed in her mind: herself, bound like this, her skirt disheveled, the black stockings leaving deep indentations, her mouth gagged, discovered by strangers. Just thinking about it made her feel dizzy, as if the whole world were collapsing. That would be complete social death, her life would be over. But Lin Yi had already stood up and walked towards the cabinet. His movements were unhurried, as if choosing a perfectly ordinary jacket. He picked up the cotton rope, the hemp rope, and the black scarf she knew all too well – the one used to blindfold her last time, now held in his hand, folded in half, crumpled into a ball. "Teacher, you've been very good today," he walked back, squatted in front of her, and with his slender fingers, lifted her chin, his thumb gently caressing the corner of her lips, "Just listen to me this once, okay?" He didn't give her a chance to beg further. Su Wanning was flipped over by him, landing face down on the carpet, her face buried in the soft plush, her nose catching a faint scent of dust. Lin Yi first pulled her hands behind her back, wrists crossed, left hand pressing on the right. Then he began to wrap the rope, using the thinnest cotton rope, starting from her wrists, winding it up layer by layer. His technique was skilled and decisive, each loop tightening extremely. The rope dug deeply into her skin, catching the edge of the stockings, bringing that suffocating sense of pressure. Su Wanning let out a faint whimper, her voice muffled by the carpet, like a small animal whose tail had been stepped on. "Wrists, forearms, elbows..." Lin Yi murmured as he tied, as if inventorying goods, "All brought together, fixed in a straight line." When the rope reached her upper arms, her arms were completely fixed into one straight line, unable to bend, unable to separate, like a piece of wood forcibly folded. She tried to struggle, her muscles tensing, but the rope didn't budge, only digging into her flesh more fiercely, bringing a burning sting. Then came the Hojojutai. This time, there was no clothing to obstruct, her top had already been removed, her bare upper body exposed to the cool air. The black rope was wrapped directly against her skin, passing under her armpits, crossing in front of her chest, brutally tightening through the soft gap between her breasts, digging deeply into the flesh, then winding around to her back, weaving an exquisite diamond pattern. With every tightening, her breasts were pushed upwards, the cleavage becoming deeper. The rustling sound of the rope rubbing against her skin was piercingly clear in the quiet room. "Mmm..." she turned her face to the side, breathing rapidly, her cheek pressed tightly against the carpet. Her legs were not spared either. Lin Yi brought her legs together, knees touching, ankles close. He began to wrap her thighs with a thicker hemp rope, the rough texture transmitted through the thin black stockings. One loop, two loops, three loops, extending downwards, past her knees, her calves, all the way to her ankles. The black stockings were deeply indented by the rope, like ravines, dividing her fair skin into pieces. Her toes curled and uncurled inside the stockings, unable to find any purchase. Finally, Lin Yi picked up the black scarf, crumpled it into a ball, and walked in front of her. He cupped her chin with one hand, forcing her mouth open, and then shoved the wad of cloth in fiercely. The scarf filled her mouth, pressing down on her tongue, pushing all the way to the back of her throat. He then wrapped the rope around the back of her head twice and tied it securely, ensuring she couldn't spit it out or make too much noise. "Mmm..." Su Wanning tried to speak, but only managed a muffled nasal sound. Saliva immediately secreted in large quantities, soaking the cloth, making the faint smell of fabric even stronger. She was now completely fixed in a kneeling Hojojutai. Her arms, bound behind her back, formed a stiff angle, the Hojojutai rope tightly constricting her bare breasts, her legs bound together, her mouth stuffed with the scarf. She tried to struggle, her body writhing within the ropes, but could only let out suppressed "mmm" sounds, like a fish deprived of oxygen. Lin Yi looked at her, his eyes terrifyingly dark. Then he bent down, one hand slipping under her knees, the other supporting her back, and lifted her up. Su Wanning was light, but with so many ropes, she still had some weight. Lin Yi's arms tightened, and she could clearly feel the tension in his muscles and the warmth of his body through his T-shirt. He held her in his arms like a large doll and walked towards the door. "Mmm mmm mmm!!!" Su Wanning's eyes widened instantly, and she struggled violently. She couldn't be carried out, couldn't be seen, it would ruin everything. But Lin Yi's arms were as firm as iron clamps. He warned her in a low voice by her ear, his hot breath spraying on her earlobe, "Don't move, Teacher... the more you move, the tighter the ropes will get." The apartment door was opened. The hallway late at night was terrifyingly quiet. The voice-activated lights turned on with the opening of the door, and the pale light instantly illuminated the entire corridor. Su Wanning was held in Lin Yi's arms, her head resting on his shoulder, her face facing the corridor. She could see the closed doors of her neighbors opposite, the reflection of the fire hydrant, and the iron door at the end leading to the stairwell. Her skirt was already rolled up to her waist, her bare thighs exposed to the air, her naked buttocks pressed against Lin Yi's arm, the coolness seeping into her bones. Her heart pounded like it was trying to break through her ribs. Lin Yi's footsteps echoed in the hallway, step by step, slow and steady. Su Wanning could hear her own heartbeat, Lin Yi's steady breathing, and the faint sound of traffic in the distance. The elevator doors opened. Lin Yi carried her inside and placed her in the corner, letting her lean against the cold metal wall. The coolness traveled from her spine to the back of her head. He pressed the top floor button. Just as the elevator doors were about to close, footsteps suddenly came from the end of the corridor – *patta, patta*, the sound of slippers dragging on the floor, mixed with the rustling of a plastic bag. Su Wanning's blood instantly froze. A middle-aged man carrying a trash bag emerged from the corner, wearing a gray undershirt, with sparse hair, his face showing the fatigue of taking out the trash late at night. He was walking towards the elevator. Su Wanning's eyes widened to their limit, cold sweat pouring down her body. She writhed desperately in the corner of the elevator, letting out violent "mmm mmm mmm!!!" sounds, but was firmly muffled by the scarf, only managing broken, desperate nasal sounds. Tears welled up uncontrollably, sliding down her cheeks, dripping onto Lin Yi's hand. Lin Yi blocked her with his body, one hand resting on the elevator wall, the other pressing down firmly on her shoulder. He warned her in a low voice, audible only to her, "Don't move, Teacher... if you're seen, this appearance of yours, bound and only wearing black stockings... you'll be completely finished." The elevator doors slowly closed. In the last second before the gap narrowed, the figure of the middle-aged man flashed past the gap. His head tilted slightly, as if he had heard something, his eyes scanning towards the elevator with a hint of confusion. Su Wanning was so frightened she almost fainted. She squeezed her eyes shut tightly, not daring to look, not daring to breathe. Her heart pounded as if it were about to explode, her eardrums filled with a roaring sound. The doors finally closed completely. The elevator began to ascend, emitting a faint hum. Su Wanning slumped in the corner, soaked in cold sweat, as if she had just been pulled out of ice water. Every tremor made the ropes dig deeper into her skin. The elevator passed the first floor, the second floor, the third floor... she was on edge with every floor, afraid someone would suddenly press the elevator button, the doors would open, revealing her disgraceful appearance. Fortunately, no one entered until the top floor. The wind on the rooftop was strong, carrying the coolness and urban clamor unique to Tokyo nights. Distant neon lights flickered, their red, blue, and yellow hues blurring the night sky into a hazy kaleidoscope. The wind blew into the stairwell, brushing against her bare skin, making her shiver violently. Lin Yi placed her in the center of the rooftop, kneeling beside a metal ventilation duct. The surface of the duct was rusty, gleaming coldly in the moonlight. He used the ropes to firmly secure her upper body to the duct, the ropes looping through the Hojojutai nodes and tied at the back. She was now kneeling completely on the rough concrete floor, facing him, unable to move an inch. The wind messed up her hair and dried the cold sweat on her body, raising goosebumps. Lin Yi squatted down and removed the scarf stuffed in her mouth. As the cloth exited, it brought with it a strand of crystal-clear saliva, glistening in the moonlight. Su Wanning gasped for air, like a fish that had been deprived of oxygen for too long finally surfacing, air rushing into her lungs, causing a stinging sensation. "Lin Yi..." her voice was hoarse to the point of being unrecognizable, her tears chilled by the wind, "You've really gone mad... this is the rooftop... what if someone comes up..." The metal rings swayed gently beneath the ceiling, emitting a faint creaking sound. Su Wanning knelt on the carpet, watching Lin Yi prepare new restraints. He took out four thick hemp ropes, and the red gag she knew well but always feared – but this time, he didn't take out the gag. Instead, he produced lubricant. "Teacher, today we're practicing oral sex," Lin Yi's voice was as calm as if he were assigning homework, "but it will be done while suspended. The 'Four-Horsemen' bind, hands and feet connected, entire body suspended. This way, you'll have nowhere to escape and can only focus on learning." Su Wanning's throat tightened. She remembered the mingled fear and pleasure of weightlessness from the last time she was suspended, and this time, the challenge of deepthroating was added. "I... I might not be able to do it well..." she whispered, "Last time you said... my teeth would hit..." "That's why we practice," Lin Yi tied her hands, binding them straight behind her back, "and today, practicing while suspended, you can't dodge. You can only accept it." He had her lie prone on the carpet and began the Four-Horsemen bind. First, he tied her ankles together, then used a long rope to connect her wrists and ankles, pulling them up behind her. Su Wanning's body was forced into an arched shape, her chest pressed against the carpet, her hips raised high, like a drawn bow. "We're going up now," Lin Yi warned, then connected the ropes to the rings and slowly tightened them. The first thing Su Wanning felt was the force pulling her wrists and ankles upward simultaneously. Her body left the ground, but instead of being suspended upright like last time, she was hoisted while maintaining her curved posture. The Four-Horsemen bind kept her hands and feet tightly connected behind her, her body suspended in a C-shape, chest down, hips protruding backward, like a captured shrimp. "Ah... this is uncomfortable..." she moaned. The position tensed her abdominal muscles, restricted her breathing, and all her weight bore down on the connection points of her wrists and ankles, creating a sharp pressure. Lin Yi adjusted the ropes, bringing her body to a suitable height – her head was just at his waist level. He unzipped his pants, releasing his erect penis, its hot tip lightly brushing her cheek. "Begin, Teacher. Take it in." Su Wanning opened her mouth, struggling to take the hot, thick shaft into her suspended form. But the Four-Horsemen bind prevented her head from moving freely; she could only rely on Lin Yi to adjust the angle, or strain her neck to lift her head. She tried to take the glans in, her tongue clumsily licking, but due to the awkward position, her jaw couldn't relax completely. As she attempted to take it deeper, her teeth accidentally scraped against the corona. "Hiss—" Lin Yi gasped and recoiled sharply, "Teacher, your teeth!" "I... I'm sorry..." Su Wanning apologized in a panic, her suspended body twisting with nervousness, which only made the Four-Horsemen bind dig deeper into her flesh. "Again. Relax your jaw, like I taught you before, cover your teeth with your lips." Su Wanning tried hard to adjust, but the suspended state made it impossible for her to concentrate. She took it in again, more cautiously this time, but as Lin Yi thrust forward, attempting to go deeper, her teeth once again bumped against the shaft. "Ah!" Lin Yi was genuinely in pain this time. He reached out and pinched her chin, "Teacher, are you doing this on purpose?" "No... I... I can't control it..." Su Wanning's tears welled up. The suspended body made her feel unprecedentedly helpless, "This position... I... I can't..." Her tears dripped onto the carpet, her body swaying gently in the ropes. The Four-Horsemen bind left her completely unable to adjust her posture. Her hands and feet were bound together and suspended behind her. She could only maintain this humiliating arch, awaiting Lin Yi's punishment or forgiveness. Lin Yi took a deep breath, clearly suppressing his pain. "Teacher, you're making me very uncomfortable like this. Since you can't use your teeth, let's practice the part without teeth first." He took out the red gag, but after a moment's thought, put it back down. Instead, he produced an O-shaped speculum – a metal ring that forcibly held the mouth open, preventing the teeth from closing. "Put this on," he inserted the speculum into her mouth. The metal ring propped her mouth open, preventing her teeth from closing and her tongue from retracting, "Now, try again. If you bump me with your teeth again, I'll leave you suspended here all night." Su Wanning, holding the speculum, nodded tearfully. She tilted her head up again. Lin Yi held the back of her head and slowly guided his penis into her forcibly opened mouth. Without the obstruction of teeth, entry became smooth, but controlling the depth was harder. Lin Yi thrust forward, the glans directly hitting the entrance of her throat. The intense foreign body sensation and choking made Su Wanning whimper, her body thrashing violently in the Four-Horsemen bind, like a fish out of water. "Don't move," Lin Yi held her head down, "Relax your throat and let me in." He thrust hard, the entire shaft entering the depths of her throat. Su Wanning's eyes widened, her throat muscles instinctively contracting, but without teeth to block, the penetration became even deeper. The feeling of being completely stretched almost made her faint. Saliva poured from the edges of the speculum, dripping down her chin onto her chest. "Very good," Lin Yi began to withdraw and thrust slowly, "Now hold this position. I'm going to move." "Wear this," Lin Yi took out another special black lace panty – the back had an opening, just enough to expose the base of the silicone plug and secure it so it wouldn't slip, "and your professional attire." An hour later, Su Wanning stood in the school office, every subtle movement causing the foreign object inside her to stir. She wore a snow-white blouse, a black pencil skirt, nude stockings, and that special pair of panties. The silicone plug was deeply embedded within her, its base pressing against her flesh. Every time she sat down, stood up, or even walked, the friction would cause the plug to shift slightly, stimulating the sensitive inner walls that had been explored the night before. Even more terrifying, Lin Yi had shown her the remote control – this plug could vibrate, and he held the power. "Good morning, Teacher Su," colleague Teacher Wang entered the office, "How was your weekend?" "It... it was okay..." Su Wanning forced a smile, carefully sitting on the chair. A sense of pressure immediately emanated from her rear, almost making her cry out. She could only sit halfway, her buttocks hovering slightly, her posture awkward but she dared not adjust. When the bell for the first class rang, Su Wanning walked to the classroom with her legs clamped together. Each step caused the plug inside her to rub against sensitive points, the secret, continuous stimulation making her body flush. The classroom was full of students. She stood on the podium, trying to maintain a normal posture, but the fullness in her rear made it impossible to concentrate. When she turned to write on the blackboard, she could feel the plug pressing deeper due to the change in position. "Class, today we will learn..." Before she could finish, a strong vibration suddenly pulsed from within her – Lin Yi had activated the remote. "Ah...!" Su Wanning's voice instantly changed, and the chalk snapped in two on the blackboard. She clutched the podium, her legs clamped tightly together, feeling the tingling vibration in her rear. The stimulation was more direct and more shameful than the vibrator from before. "Teacher Su, are you alright?" a student in the front row asked with concern. "No... I'm fine..." She took a deep breath, trying to calm her breathing, but her cheeks were already burning red. "Just... a little dizzy..." She dared not sit down, as sitting would make the plug press deeper; nor could she stand up straight, as standing straight would transmit the vibration directly to her spine. She could only lean on the podium, slightly bending her knees, and continue teaching in a shameful posture. Lin Yi sat in the last row, looking down at his phone, his fingers sliding across the screen. With each slide, the plug inside Su Wanning would change modes – sometimes pulsing, sometimes continuous, sometimes suddenly stopping and then suddenly starting again. "This... this passage... expresses... ah..." Su Wanning's voice was intermittent, the vibration in her rear making it impossible to speak coherently. She could feel the residual fluid from last night mixing with the lubricant, sloshing inside with the plug's vibration. The feeling of being completely filled and completely controlled made her lower body wet again. "Teacher Su, your face is very red, do you want to go to the infirmary?" the class monitor stood up and asked. "No... no need..." Su Wanning gritted her teeth, her fingernails digging deeply into her palm. Just then, Lin Yi turned the vibration to the highest setting. "Mmm—!" She let out a low whimper, her body suddenly leaning forward, her buttocks arching backward, almost collapsing on the spot. The intense vibration directly stimulated the sensitive points explored the night before. The feeling of pleasure intertwined with shame made spots appear before her eyes. "Teacher, are you really okay?" More students began to notice her abnormality. "I... I need to go to the restroom..." Su Wanning finally broke down, clamping her legs together and quickly exiting the classroom. Each step caused the plug to vibrate and rub, making her almost cry out. The corridor was empty. She leaned against the wall, gasping for breath, her rear still convulsing violently. Lin Yi walked up from behind, pulled her into an empty classroom nearby, and locked the door. "Teacher, the way you were on the podium just now..." He pressed her against the wall, his hand reaching under her skirt, pressing the protruding base through her panties. "So slutty. Clamping so tightly, do you want more?" "No... don't... here... we'll be discovered..." Su Wanning cried, but let out a high-pitched moan as he pressed the base. Lin Yi ignored her pleas. He unzipped his pants, turned her around, and had her place her hands on the windowsill, her buttocks arched backward. He pulled out the silicone plug, and before the feeling of emptiness could dissipate, he thrust his erect penis directly into her rear. They were two long leather sheaths, extending from the thighs all the way down to the ankles. Lin Yi had Su Wanning sit on the edge of the bed and fitted the leg sheaths onto her straight legs. The sheaths had metal braces inside, and once buckled, her knees could not bend, leaving her legs stiff and straight. The straps were fastened, and the locks clicked shut. Su Wanning tried to move, but the metal braces of the leg sheaths made her legs like two wooden sticks, completely unbendable. She could only sit bolt upright, needing Lin Yi's support even to stand. "Very good," Lin Yi said, helping her to stand. "Now the teacher cannot move. But this is not enough." He took out the last prop – a metal chastity belt. It was a silver metal belt with a plate in the front and thin metal strips in the back. The front plate had a small hole in the center, and the metal strips connected to a lock at the back. The inside of the plate had raised bumps, which would press tightly against her private parts once locked. "This... no..." Su Wanning's face turned pale at the sight of it. "Yes," Lin Yi pushed her back onto the bed, unzipped the crotch of her latex suit, revealing her clitoris and anus. "The teacher has orgasmed too many times today and needs to be controlled. This chastity belt has a vibrator inside, but the teacher cannot turn it off herself, nor can she touch it. She can only receive it passively." He placed the chastity belt on her waist, the front plate covering her private parts perfectly. The cold metal sent a shiver through the latex. Lin Yi adjusted the position, aligning the bumps on the inside of the plate with her clitoral glans, then tightened the belt and locked it. "Ah..." Su Wanning let out a moan. The chastity belt was tight, the plate pressing firmly against her clitoral glans. The sensation of pressure, combined with the confinement of the latex and arm restraints, pushed her to the brink of collapse. "Final step," Lin Yi said, helping her to stand. "Into the vacuum bed." He lifted a cloth in the corner of the room, revealing a large transparent plastic bag connected to an air pump. This was the vacuum bed, an extreme restraint device. Su Wanning was helped to lie down inside the vacuum bed. She was dressed in a black latex suit, her arms bound behind her back by arm restraints, her legs fixed straight by leg restraints, and a metal chastity belt locked around her waist. Lying in the vacuum bed, she was like a black doll, completely unable to move. Lin Yi zipped up the bag, sealing her completely inside. "Deep breaths," Lin Yi's voice came from outside, slightly muffled. "I'm going to start pumping." The air pump whirred to life, and Su Wanning felt the air being rapidly drawn out. The latex bag began to contract, clinging tightly to her body. First, her limbs were pinned, then her torso, and finally her head. The latex, arm restraints, leg restraints, and chastity belt – all the restraints were amplified by the vacuum bed. She felt as if she were encased in cement, utterly immobile. The vacuum bed tightened further, the latex molding perfectly to her body's curves, highlighting the sheen of the black latex and the outline of the metal chastity belt. Her chest rose and fell with extreme difficulty, only shallow breaths possible. The feeling of being completely enclosed and utterly controlled filled her with both terror and excitement. "Now," Lin Yi's voice came from outside the vacuum bed, "activate the chastity belt's vibration function." "Mmph!" Su Wanning's eyes snapped open. The vibrator inside the chastity belt activated, its low-frequency pulses transmitting through the metal plate to her clitoral glans. The stimulation was mild, but in her completely immobilized state, it was magnified countless times. She wanted to writhe away, but the vacuum bed held her so tightly she couldn't move even a millimeter. She wanted to reach up and turn off the vibration, but her arms were bound behind her, rendering them useless. She wanted to bend her legs for relief, but the leg restraints kept them like two wooden sticks. She could only accept, only feel, only endure. "How does that feel?" Lin Yi asked. "The teacher can't move at all now, right? This is true restraint." "Mmph... mmph..." Su Wanning could only emit muffled sounds from her throat. The vibration intensified, mid-frequency. The bumps on the metal plate rubbed against her clitoral glans, the stimulation direct and continuous. She wanted to climax, but the pressure prevented the pleasure from building sufficiently. She was trapped on the edge of orgasm, unable to ascend or descend. "Do you want to climax?" Lin Yi seemed to read her mind. "Beg me, and I'll let the teacher climax." "Mmph... mmph mmph..." Su Wanning let out a pleading sound. "Louder, I can't hear you." "Please... please..." she managed to squeeze out a few words, her voice weak from the pressure of the latex. "Beg me for what?" "Please... let me... let me climax..." The darkness within the vacuum bed was absolute, devoid of light and sound, save for the relentless vibration inside the chastity device and the mounting pleasure within her body. A forced orgasm every half hour had conditioned her body into a reflex; even in a daze, her muscles would spasm and twitch. After the seventh climax, she had almost lost consciousness. But the pressure of the latex suit and the confinement of the vacuum bed prevented her from truly falling asleep, leaving her to float in a state between waking and dreaming, enduring the torment of the internal vibrations. It wasn't until dawn that the vacuum pump finally ceased its operation. Air slowly flowed into the vacuum bed, and the latex bag gradually loosened. Lin Yi unzipped it and pulled Su Wanning out. She was drenched in sweat, her latex suit glistening as if she were a black mermaid just pulled from the water. "Teacher performed very well last night," Lin Yi said as he unfastened her chastity device. "Seven orgasms, each one faster than the last. Your body has been trained to be incredibly sensitive." A whimper escaped Su Wanning the moment the metal guard retracted from her clitoris. It was already red and swollen from friction, aching with the slightest touch, yet carrying a strange sense of emptiness. "Do I take off the latex suit now...?" she asked weakly, her voice hoarse. "No," Lin Yi smiled. "You'll keep the latex suit on. Teacher is going out wearing this today." "What? No... they'll find out..." Su Wanning's eyes widened. "You'll wear clothes over it," Lin Yi began to unfasten her arm and leg restraints. "But underneath, it will still be the latex suit, and... there will be new restraints." He produced a new item – a black leather straitjacket. It looked like a restraint garment from a mental institution, but far more refined. It had crossed straps on the back, a complex buckle system in the front, and integrated sleeves ending in metal rings. "This is a straitjacket," Lin Yi helped her put it on. "It goes over the latex suit and completely immobilizes your upper body. Your arms will be crossed in front of your chest, unable to move apart." He fitted the straitjacket onto Su Wanning, tightening the straps. The leather hugged the latex suit, making the already tight confinement even more secure. Su Wanning's arms were forced into a crossed position against her chest, elbows touching, wrists secured to her shoulders by straps, rendering her completely immobile. "Next, the lower body," Lin Yi produced a black leather skirt. The skirt looked normal, but it had a hidden mechanism inside. Lin Yi fastened it around her waist and tightened it. The skirt was very short, barely covering her buttocks, but on the inside, there were hidden straps connected to a thin metal chain. The other end of the chain was an oval metal plug. "Bend over," Lin Yi commanded. Su Wanning understood what was coming. Trembling, she bent over, presenting her backside to Lin Yi. Lin Yi unzipped the latex suit at the anus, revealing the slightly slackened entrance, and then slowly pushed the metal plug inside. "Ah... so cold..." The metallic chill made her shiver. "This is a butt plug," Lin Yi connected the metal chain to a buckle inside the skirt. "It will rub when you walk, reminding Teacher what's inside. And... there's a little surprise here." He pressed a spot on the skirt, and the metal plug suddenly vibrated. "Mmm!" Su Wanning straightened abruptly, clamping her legs together. "The vibration is remote-controlled," Lin Yi said, shaking the remote in his hand. "All day today, Teacher will wear this out. To the cafeteria for meals, for a walk on campus, even... to the office to pick something up." "No... no... they'll find out..." Su Wanning shook her head desperately. "They won't find out," Lin Yi put a long trench coat on her, covering the straitjacket and skirt. "From the outside, it will look like ordinary clothes. But Teacher will know the state you're in – full latex suit, straitjacket immobilizing your arms, and a vibrating plug in your skirt. And..." he leaned close to her ear, "the chastity device is still on, just an internal model, hidden inside the latex suit." Su Wanning then felt it – a hard object pressing against her clitoris in the crotch of the latex suit, masked by the suit's tightness. "Now, let's go," Lin Yi took her hand, like a normal couple. "First, we'll go to the cafeteria for breakfast. Teacher has been hungry all night and needs to regain strength." The campus was quiet in the early morning, but the cafeteria already had many students eating breakfast. Lin Yi led Su Wanning inside and found a table by the window. "I'll go get breakfast. Teacher, sit still," Lin Yi smiled. "Remember, there's something inside. If you move too much... it might fall out." Su Wanning sat stiffly in her chair, her legs pressed together, afraid to move. The butt plug was inside her, the metal chain connected to the skirt, and every slight movement brought internal friction. Even more terrifying was the feeling that passing students were looking at her. Although the trench coat concealed all the restraints, she felt as if everyone could see through her secret. "Teacher Su?" a familiar voice called out. Su Wanning looked up. It was Wang Fang, the class representative, a lively girl with a ponytail. "Ah... Wang Fang..." Su Wanning tried to keep her voice normal. "So early..." "Is Teacher feeling better? I heard you've been on leave for several days," Wang Fang asked with concern. "You look a bit pale, haven't you recovered yet?" "No... it's fine... almost better..." Su Wanning bit her lip, trying to ignore the sudden intensification of the internal vibration – Lin Yi had pressed the remote from a distance. "Ah!" she couldn't help but cry out. "What's wrong, Teacher?" Wang Fang looked at her, puzzled. "No... nothing... my stomach suddenly hurts..." Su Wanning's face turned bright red. Her hands were fixed in front of her chest by the straitjacket, so she couldn't even make a gesture to cover herself. She could only sit rigidly, feeling the internal vibrations grow stronger. "Then Teacher should rest more," Wang Fang said kindly. "I'll go get breakfast now. Goodbye, Teacher." The breakfast was an ordeal. Su Wanning's arms were restrained by the straitjacket, making it impossible for her to even hold chopsticks. She had to be fed by Lin Yi. With every swallow, the contractions in her abdomen would shift the metal plug inside her, bringing a sense of shame. Even more terrifying was that Lin Yi would occasionally press the remote control, making her feel a vibration at the moment of swallowing, nearly causing her to choke. "Alright, let's go," Lin Yi said after finishing his meal, helping her stand up. "We'll take a walk around campus." They walked out of the cafeteria and slowly along the campus path. The morning sun was pleasant. Students were reading outdoors, teachers were strolling, and everything appeared so normal. But Su Wanning knew that beneath her clothes, she wore a latex suit and a straitjacket, a metal plug was inserted in her rear, and her clitoris was pressed by a chastity device. She was the picture of a perfectly trained slave. "Let's go to the lake," Lin Yi said, holding her hand. "There are fewer people there, and the scenery is nice." Indeed, there weren't many people by the lake, only a few students sitting on benches, reading. Lin Yi led her to a pavilion by the lake and had her sit on a bench. "Does Teacher know," Lin Yi suddenly said, "that this pavilion is a blind spot for surveillance?" An ominous premonition welled up in Su Wanning's heart. "So..." Lin Yi smiled and unbuttoned her windbreaker, revealing the leather straitjacket underneath. "Here, I can relax the restraints a bit." He unbuckled a few straps on the front of the straitjacket, allowing Su Wanning's arms to move slightly, but still not completely freely. "Lift your skirt yourself," he commanded. "Let me see the plug inside." "No... someone might pass by here..." Su Wanning pleaded. "Hurry, or I'll turn it to the highest setting and make Teacher climax right here." Su Wanning bit her lip and tremblingly lifted her skirt. The black latex gleamed in the sunlight. A bulge was visible at her rear, and the outline of the metal chain could be faintly seen. "Beautiful," Lin Yi said, squatting down and caressing the bulge with his finger. "Teacher has adapted completely. You've worn the plug for so long, and your rear is still so tight." As he spoke, he pressed the highest setting. "Mmmph!" Su Wanning almost cried out and quickly covered her mouth. An intense vibration coursed through her rear, the metal plug vibrating wildly inside her. The stimulation was too overwhelming; she felt her consciousness dissolving. "Endure it," Lin Yi commanded. "If you climax here, I'll have Teacher strip naked, tie her to the pavilion pillar, and let everyone see." Su Wanning desperately held back, her legs clamped together, her body trembling. The pleasure built faster and faster; she felt like she was on the verge of collapse. But Lin Yi suddenly turned off the vibration, stopping her at the last moment. "It's not time yet," he said, helping her lower her skirt and re-button her windbreaker. "Let's keep walking, to the office. Doesn't Teacher need to get something?" They walked towards the Fine Arts department office building. The office building was empty on a weekend; most teachers were not present. Su Wanning used her key to open her office. It was neat and tidy, with her paintings hanging on the walls and students' assignments piled on her desk. "Wait here for a moment," Lin Yi said, having her sit in a chair. "I'm going out to make a call. I'll be back in five minutes. Teacher is not allowed to move, not allowed to remove the plug herself, understand?" "Understand..." Su Wanning nodded weakly. Lin Yi walked out and closed the door. The office fell silent, save for the ticking of the clock on the wall. Su Wanning sat in her office chair, wearing her latex suit and straitjacket, a metal plug inserted in her rear, waiting for her student to return and continue her training. Suddenly, the doorknob turned. Su Wanning looked up in alarm, thinking Lin Yi had returned, but it was someone else who entered – the department head, a stern man in his fifties. "Teacher Su?" the department head asked, frowning at her. "I heard you were sick. Why are you in the office? You look so pale, are you not feeling well yet?" "Ah... Director... I... I came to get something..." Su Wanning remained stiff in her chair, afraid to move. The metal plug inside her made her extremely uncomfortable. "You need to take care of yourself," the department head said, walking over and standing in front of her. "Young people shouldn't take their health for granted. By the way, is the public lecture next week ready?" "Rea... ready..." Su Wanning nodded frantically, praying the department head would leave quickly. "That's good," the department head said, glancing at her again. "You're wearing so many clothes? Aren't you hot? The air conditioning in the office is quite strong." "I... I'm afraid of the cold..." Su Wanning's voice trembled. Just then, she felt the metal plug inside her suddenly vibrate – Lin Yi was pressing the remote control outside the door. "Mmm!" She bit her lip sharply, her body stiffening. "What's wrong?" the department head asked, looking at her with confusion. "N-nothing... I suddenly feel a bit dizzy..." Su Wanning's eyes welled up with tears. The pleasure was building inside her, and she had to hold it back in front of the department head, unable to cry out or show any weakness. "Then you should go back and rest," the department head finally turned to leave. "Your health is important." The moment the door closed, Su Wanning nearly collapsed. She slumped in her chair, gasping for breath, tears streaming down her face. In that moment, she had almost climaxed in front of the department head. "Can't touch it, can you?" he heard movement outside the door. "That's the point. Your body, teacher, only I can touch. Only I decide when to unlock it, when to use it. You need to learn this feeling of being controlled, this complete belonging." After washing up, she put on a loose-fitting long skirt and wide-legged pants, cinching the belt tight to conceal the metal around her waist. She looked normal in the mirror, but she knew that beneath the fabric, her body was encased in stainless steel, locked away, a possession of another man. "Now, let's go," he took her hand, like any ordinary couple. "Today, I'll drive you to school, and then I'll rent a place nearby to monitor your condition at all times." On the way to work, sitting in the taxi, her hands unconsciously drifted to her waist. The cold of the metal seeped through her clothes, a constant reminder of her locked state. Every bump sent a slight vibration through the chastity device, a subtle stimulation against her sensitive parts. The driver glanced at her in the rearview mirror. She quickly pulled her hands away, her heart pounding, terrified of being discovered. "Nervous?" Lin Yi squeezed her hand. "Teacher needs to learn to remain calm in public. Even when your body is completely locked, you can't let anyone see it. This is the skill of an advanced slave." Upon arriving at school, she walked into the office building. Teacher Wang greeted her in the hallway. "Good morning, Teacher Su. You look a bit pale, are you feeling unwell?" "No... no, I'm fine..." she forced a smile, feeling the metal at her waist suddenly become heavier. "Maybe I didn't sleep well... didn't rest properly over the weekend..." "Take care of yourself," Teacher Wang said with concern. "The weather's been changing a lot lately, don't catch a cold." She nodded and hurried to her office. As she sat down, the front panel of the chastity device pressed tighter, its metal edge digging into her inner thigh, causing a dull ache. She had to maintain an upright posture, no slouching, or the metal would dig in more painfully, and the outline of the device would become more apparent. During the first class, she stood at the podium, explaining sketching techniques to her students. With every movement, every turn, she could feel the weight and the cold of the metal around her waist. The students below listened attentively, none of them aware that their teacher was locked in a stainless steel chastity device, completely sealed, completely belonging to another man. She tried to keep her voice steady, but every time she bent over to guide a student, the metal would rub, causing a jolt that made her voice tremble slightly. "Teacher Su is standing so straight today," one student whispered to his deskmate. "Like a soldier. And her walk seems a bit strange, like she's being careful..." She heard them and could only offer a wry smile. It wasn't that she wanted to stand straight; it was the metal forcing her to, preventing her from bending or relaxing. And she walked carefully because with every step, she could feel the presence of the metal, afraid that any sudden movement would reveal its outline. For the second class, she needed to sit to demonstrate still life sketching. As she sat down, she had to slowly adjust her position to prevent the front panel of the chastity device from pressing too painfully. The metal pressed against her clit, making it impossible to concentrate. She could only lecture mechanically, her fingers trembling slightly. "Teacher Su's hands are shaking a bit," a student asked. "Are you cold? Is the air conditioning too strong?" "A little... a little cold..." she replied, seizing the excuse. "Everyone should also stay warm..." At noon, she finally returned to the apartment Lin Yi had rented near the school. He was waiting for her, a set of keys in his hand. "I saw your performance this morning through the surveillance," he said. "Teacher did very well, no exposure, no loss of composure. Now, I'll unlock the chastity device, not to release you, but for cleaning and inspection. Long-term wear requires hygiene to prevent infection." He had her lie down on the sofa, unbuckled the belt, and then used a key to unlock the clasp at the back. With a click, the metal front panel was removed, exposing her swollen, wet, and sensitive clit and rear opening to the air. "How did it feel wearing it all morning?" he asked, his fingers examining the skin where the metal had pressed. There were faint red marks on her waist and slight chafing on her inner thighs. "It was... very uncomfortable..." she said truthfully, her voice tinged with a hint of grievance. "I could feel it constantly, a constant reminder. I wanted to touch it but couldn't... and when I walked, the metal rubbed against my inner thighs, very sensitive... I couldn't concentrate in class, always thinking about what was on my waist..." "That's exactly the feeling I want," he said, his finger lightly touching her swollen clit. "To constantly remind teacher that your body doesn't belong to you, it belongs to me. Now, clean up, and then put it back on. There are two more classes this afternoon." He helped her clean, rinsing with warm water, applying an anti-inflammatory ointment, and then relocking the chastity device. With a click, the clasp closed, and she was once again sealed in metal, the familiar weight and coldness enveloping her. "Now, add this," he said, holding up a metal collar. Not the leather one from before, but a wide, three-centimeter-wide stainless steel band engraved with "Property of Lin Yi." It had a lock, but no keyhole. "This is also for long-term wear, just like the chastity device. No one can open it but me. Teacher needs to get used to wearing metal around her neck, metal around her waist, becoming a true metal possession." He helped her put it on. The cold metal pressed against her neck, and the clasp clicked shut behind her head. Now, a cold metal collar encircled her neck, and a heavy chastity device encircled her waist. Two pieces of metal simultaneously bound her, their combined weight exceeding three kilograms, a constant reminder of her identity. "Go to class," he said. "I'll be watching teacher on the monitor this afternoon. Remember, no exposure, no loss of composure. Act like a normal person, even when your body is completely locked." The afternoon classes were even more arduous. The metal collar pressed against her trachea, making her voice hoarse when she spoke, forcing her to clear her throat frequently. The chastity device made it difficult to sit for long periods, requiring her to stand up and adjust her posture periodically to avoid back pain. Teacher Li, a colleague, asked if she had a cold, as her voice sounded off. She could only nod, saying it might be pharyngitis. After the last class ended, she finally returned to the apartment. Lin Yi unlocked the chastity device, but the collar remained on. "Now, for the night training," he said. "Teacher needs to get used to sleeping in metal. Handcuffs on your wrists, shackles on your ankles, and the collar on your neck. All of it for the entire night. This is the ultimate experience of metal restraint, ensuring teacher is locked, controlled, and owned, even in her dreams." He produced a pair of stainless steel handcuffs and shackles, heavier than the ones from earlier, with locks but no keyholes. Her wrists were locked with a click, her ankles shackled with a click. Now her limbs were bound by metal, and with the collar around her neck, five pieces of metal simultaneously restrained her, their total weight exceeding five kilograms. "Sleep now," he said, carrying her to the bed and covering her with a blanket. "You have class tomorrow. Teacher needs to get used to this life, waking up in metal, sleeping in metal, becoming a true metal slave. Get used to the weight, the cold, everything about being locked." She lay in his arms, her entire body feeling the cold touch of metal. Her wrists and ankles were pressed down by the weight, her neck was tightened by the collar, making breathing slightly difficult. Her body couldn't stretch freely. Yet, strangely, within the embrace of the metal, she felt an unprecedented sense of security and belonging, as if she were completely protected, completely owned, and completely free from thought. She soon fell asleep, amidst the clinking of metal and the sensation of cold, sinking into a deep slumber, awaiting the continuation of tomorrow. "In," he opened the cage door, "crawl in yourself, kneel yourself, accept your captivity yourself." Su Wanning looked at the cage, fear surging in her heart. It looked like something for a large dog, but now it was to hold her, alone, for twenty-four hours. "Don't... for too long... I'll go mad..." she took a step back. "It has to be long," he grabbed her wrist, "Teacher needs to learn to survive in extreme solitude and restriction, to learn to abandon dignity, to learn to live like an animal. In." She was pushed to the front of the cage, with no choice but to kneel and crawl inside. The cage's metal mesh was cold against her knees and palms, the bars forming a confinement around her, preventing her from standing, from stretching, forcing her to curl up. Lin Yi closed the door with a click, locking it. The key dangled in his hand for a moment before disappearing into his pocket. "Now, Teacher is a prisoner in the cage," he said, "Twenty-four hours, no coming out, no asking to come out, only waiting, only enduring, only accepting." He took out a metal bowl, not an ordinary one, but one for dogs, made of stainless steel, fixed to the outside of the cage, with only a small opening for her tongue to lick from. "Food and water," he said, "Teacher will eat like an animal, drink like an animal, excrete like an animal. The cage is enclosed, but with a mesh bottom, waste will fall directly through, a tray below to catch it. Teacher will learn to take care of everything in the cage, without shame, without resistance, completely like an animal." "No... this is too shameful..." she cried, hands gripping the bars, "I'll die... I really will..." "You won't die," he sat down on a chair beside the cage and began to read, "Teacher needs to get used to this life, to being confined, to being watched, to being controlled. I will be here with Teacher, but I won't let Teacher out until the twenty-four hours are over." Time began to pass. The first hour, she knelt, trying to find a comfortable position, but the cage was too small. No matter how she adjusted, she would hit the bars, feeling restriction and pressure. The cold metal seeped into her knees and palms, chilling her to the bone. The third hour, she was hungry, looking at the metal bowl outside, but unwilling to lick it like an animal. She endured, trying to pass the time by sleeping, but the cage bars pressed against her body, making true sleep impossible. The fifth hour, she finally surrendered. She crawled to the front of the cage and extended her tongue, licking the food in the bowl—a liquid nutritional paste, designed for easy licking. Shame brought tears to her eyes, but hunger conquered dignity. The eighth hour, she needed to relieve herself. She held it in, trying to wait until he left, but he remained, sitting beside her, reading, glancing at her occasionally. Finally, she could bear it no longer. In the cage, on the mesh floor, under his gaze, she relieved herself. Shame reached its peak. She collapsed in the cage, trembling, tears dried, her consciousness blurring. The twelfth hour, midnight, she fell asleep, curled up in the cage like an abandoned dog. Lin Yi covered her with a blanket, but did not open the cage, simply letting her spend the night surrounded by metal, in confinement, in complete control. The morning of the twenty-fourth hour, she woke up, stiff, muscles aching, but alive, still in the cage, still imprisoned. Su Wanning stared at the new metal device, her body chilling as if doused with ice water. It was twice as wide as the previous chastity belt, extending from just below her ribs to her hip bones, completely encasing her waist and abdomen. It was like a suit of metal armor, or perhaps an exquisite cage. Made of stainless steel, its surface was polished to a mirror sheen, reflecting her terrified image. The edges were smoothly welded, with no gaps, no keyholes, only a tiny electronic sensor zone, like some high-tech torture instrument, a punishment from the future. "No..." she stumbled back, her voice trembling, choked with tears. "At least... at least let me rest for a day... It's been three days... my skin hasn't recovered... my waist still hurts..." "It has to be now," Lin Yi stepped forward, his eyes alight with a fervent obsession. "The moment Teacher just tasted freedom, the moment Teacher knew what freedom felt like, the moment Teacher just shed the old cage and the imprints still lingered on her skin, I will lock it again. And I will lock it tighter, more permanently, more inescapably. This way, Teacher will truly understand that freedom does not belong to you, it belongs to me, forever mine. Teacher is merely a borrowed vessel, a possessed object, a captive belonging." He made her lie down and began to fit it onto her. The new waist-cinching chastity belt was heavier than the old one, weighing five kilograms on its own. Once on, her waist immediately sagged, forcing her to straighten up again, like a sculpture being forcibly shaped. The metal panels covered her entire abdomen, cold and hard, like an invisible hand pressing down on her internal organs. The internal padding was silicone, but the metal edges still dug into her flesh, a constant pressure and reminder. "Now, lock it," he produced a black electronic key, like a small remote control, and aimed it at the sensor zone. "This is a custom-made electronic lock. There's no physical keyhole. It cannot be picked, cannot be cut, cannot be bypassed. Only this key can open it, and the key is in my hand, forever in my hand." With a beep, a green light flashed, and the buckle automatically closed. A mechanical whirring sound came from within, like gears meshing, like a creature being swallowed. She tried to pull at it, to pick at it with her fingers, to pry at it with her nails, but the metal didn't budge. There were no gaps, nowhere to pry. It was as if it had grown from her body, as if it were a part of her. "Test," he said, pressing another button, a smile playing on his lips. The internal vibrator suddenly activated, on a high setting. Intense vibrations transmitted through the metal panel, directly targeting her clitoris. The stimulation was too direct, too powerful, making her scream out instantly. Her body convulsed violently within the metal cage, but the rigidity of the waist belt prevented her from curling up, from dodging, from adjusting her position. She could only lie flat and endure, like a fish pinned to a cutting board. "Stop... stop..." she pleaded, tears streaming down her face. "It's too intense... it'll break... it really will..." He turned off the vibration, but the lock remained. The metal still clung coldly to her skin, a reminder of her permanent imprisonment. "From today onwards, only I can unlock this device," he said, his voice calm and absolute. "Even if Teacher needs to use the restroom, needs to shower, needs to do anything, it will require my permission, my presence, and my unlocking with the key. Furthermore, I can control it remotely at any time, activate the vibration at any time, adjust the intensity at any time, and make Teacher climax at any time, anywhere, whether Teacher is in class, in a meeting, eating, sleeping, at any time, any place, under any circumstances." She lay there, feeling the weight on her waist, five kilograms of metal, a permanent cage, an inescapable shackle. It felt like pregnancy, like carrying a heavy burden, like being abandoned by the world. She tried to sit up, but the weight on her waist made her movements clumsy, like a woman in the late stages of pregnancy, or a warrior in heavy armor. Every movement required extra effort and brought the friction and pressure of the metal. "Now, go take a shower," he said, helping her to stand. "Then go to sleep. Tomorrow, you go to work as usual, wearing this. All day, the entire time. You cannot take it off, cannot unlock it, cannot expose it." Showering was torture. The metal couldn't be submerged in water for long, so she could only wipe her body with a damp towel, avoiding the area of the waist belt. The feeling of incomplete cleansing made her feel perpetually dirty, perpetually incomplete. When sleeping, the rigidity of the waist belt prevented her from lying on her side or turning over. She could only lie flat, as if fixed in a coffin, as if cast in concrete. Every position brought aches and numbness. The next morning, she stood before the mirror. Under her professional suit, the outline at her waist was clearly abnormal, like a heavy back brace, or some kind of medical device, or something else unspeakable. When walking, the five-kilogram weight made her steps heavy and slow. Each step was like wading through a swamp, like a prisoner dragging chains. The metal swayed slightly with her gait, causing internal friction and stimulation. Arriving at school, the director was already waiting for her in the office, his expression stern. "Medical certificate?" the director asked, his gaze sharp, as if trying to see through her disguise. She handed over the certificate from Teacher Li's cousin – severe lumbar dislocation, requiring long-term wear of a metal corrective device, rest recommended but the patient insisted on working. The director took it with suspicion, examining it closely, his fingers tracing the texture of the paper. He then looked at the outline of her waist, that abnormal thickness and hardness, and finally accepted it grudgingly, but the suspicion in his eyes did not dissipate. But the real torture was work. Sitting at her desk, the metal panel of the waist belt pressed against her abdomen, preventing her from taking deep breaths. She could only breathe shallowly and quickly, like a fish deprived of oxygen by the world. When she stood up to lecture, the five-kilogram weight made her back ache, as if broken, as if crushed. She had to lean on the podium to stand steady and frequently change positions to relieve the pain. "Teacher Su's back seems worse..." some colleagues whispered. "She's even holding onto the wall when she walks..." "I heard she's wearing a metal brace... it's very heavy..." As dusk settled, the setting sun cast a warm glow through the living room window. Su Wanning had been sitting on the sofa for a full eight hours. The inflatable butt plug and dildo inside her made it impossible to concentrate. She had no idea what was on television. The sensation of being filled simultaneously from front and back was constant, the metal plate of the chastity device pressing against her clitoris, leaving her both aroused and unable to find release. The door opened, and Lin Yi walked in, holding a complex mechanical device. "It's time," he said. "Teacher's training today was excellent. You remained filled all day without complaint, without trying to remove anything. Now, Teacher will be rewarded with a climax, but not an ordinary one. It will be a mechanically forced climax." He unfastened her chastity belt and removed the dildo, but the inflatable butt plug remained inside. He even inflated it a few more times, making it expand even larger. "Go to the basement," he commanded. "The real reward is down there." The basement had been converted into a mechanical chastity training room. In the center stood a metal rack equipped with two robotic arms, each fitted with a massive dildo, thicker and longer than the one she had worn all day. "This is the stroking machine," Lin Yi introduced. "Its speed and depth can be adjusted, capable of up to two hundred thrusts per minute. Today, Teacher will experience a mechanically forced climax. Not human rhythm, but machine rhythm. Unpredictable, unadaptable. You can only endure." Su Wanning looked at the device, her legs feeling weak. Two hundred thrusts per minute – a speed unattainable by humans. "Get on yourself," he gestured to the metal rack. "Back to me, kneel down, bind your hands to the rack, and lift your ass." She climbed onto it with difficulty. The inflatable butt plug shifted inside her with each movement, causing her to tremble with every step. She knelt on the metal rack, her hands secured to the armrests by leather straps, her waist fixed by another strap, and her legs spread by a brace, rendering her completely immobile. "Now, insert," Lin Yi adjusted the position of the robotic arms. The dildo in front aligned with her clitoris, and the one behind aimed at the tail of the inflatable butt plug. "Do you want to remove the rear inflatable plug?" she asked. "No, it stays," he replied. "The rear robotic arm will press against the inflatable plug, pushing it deeper inside, while the front one inserts directly. Teacher will experience the sensation of being penetrated simultaneously from front and back by mechanical means." He flipped the switch. "Ah—!" The front dildo penetrated all the way in, with no foreplay, no adaptation. Its immense size stretched her vagina open. The robotic arm began to move, not with human rhythm, but with cold, regular, relentless thrusts. One hundred times per minute, one hundred twenty, one hundred fifty... The speed increased, and she felt her vagina being completely torn apart, mechanically abraded, relentlessly penetrated. The stimulation was too intense, too direct. She was on the verge of climax instantly. "I'm going... I'm going... It's too intense..." "No," he commanded. "Teacher must endure, for at least ten minutes. This is mechanical training. Human will against mechanical compulsion." He increased the power of the rear robotic arm, pressing it against the inflatable butt plug, forcing the already maximally inflated plug even deeper into her rectum, while the front stroking continued to accelerate. "Ahhh—!" The dual mechanical stimulation, the high-speed thrusting in front, the deep pressure from behind, she felt her body being completely ripped apart, her consciousness about to shatter. The pleasure built up too quickly, too fiercely, she couldn't control it at all. "Endure," he said, checking his watch. "Five more minutes." Five minutes felt like an eternity. The machine moved relentlessly. Her vagina became red and swollen from the friction. The inflatable plug pressed against the inner walls of her rectum. The dual stimulation caused her body to convulse, but she had to endure, not to climax, not to release. On Thursday morning, as sunlight streamed through the curtains, Su Wanning awoke to find Lin Yi by the bedside, a large quantity of ropes and metal buckles laid out. "Today, we're training the European straight-arm restraint," he said, his voice calm and serious. "This is one of the most rigorous arm restraints. Both arms are fully extended, bound behind the back, elbows touching, wrists together. The entire arm is fixed like a stick, completely unable to bend, to move, to protect the body. This restraint forces you to stand tall, to be exposed, to be helpless." He had her remove her sleepwear, leaving only the electronic metal waist cincher. She had been wearing it for seven full days. Her skin had adapted to its weight and coldness, but the internal vibrator could be activated at any moment, a constant reminder of her perpetual captivity. "First, arm preparation," he instructed, having her stand straight with her arms hanging naturally. He began to wrap ropes around her arms, not tightening them immediately, but loosely coiling them from wrists to elbows, then to the upper arms. It was a preparatory action, allowing her limbs to gradually adjust to the sensation of being bound. Then, he suddenly pulled taut, forcing her wrists together, the backs of her hands pressed against each other. The ropes dug deeply into her flesh. "Ah... so tight..." she moaned softly. "This is just the beginning," he said. "The key to the European straight-arm restraint lies in the elbows." He pulled her arms back, forcing them to extend fully, then brought her elbows together, pressing them tightly, as if glued. He then used thicker ropes to wrap around her elbows, one loop, two loops, three loops, each tightened, completely immobilizing her elbows, preventing them from separating even a millimeter. Next were the wrists. Over the already joined wrists, he added extra bindings, wrapping them meticulously until her hands lost all mobility. Her fingers could only curl slightly, unable to grasp or extend. Now, her arms were completely fixed into a single, straight rod behind her back, forcing her chest forward, her shoulders back, her spine erect. She could not hunch, could not curl up, could not protect herself. "Now, the connection," he said. He produced a short chain and connected her arm restraints to a ceiling ring. It wasn't tight, merely holding her arms in a raised position, preventing her from lowering them, forcing her to maintain this posture of a forced, proud chest. "European straight-arm restraint complete," he stepped back to admire his work. "Teacher, look in the mirror." She turned her head with difficulty, glancing at the mirror. In it, her arms were completely immobilized behind her back, like a bound wooden stick. Her chest was forced forward, her waist cinched by the metal belt. Her entire being radiated extreme exposure and helplessness. The ropes formed neat diamond patterns on her arms, the red cord a stark contrast against her pale skin. "Now, leg restraints," he said. He had her spread her legs, then wrapped ropes around her ankles, tightening them and connecting them to floor anchors, forcing her legs apart, unable to bring them together or move. Her inner thighs were also bound by ropes, forming leg cuffs, rendering her lower body equally immobile. Now, she was completely unable to move. Her arms were fixed in the straight-arm restraint, her legs spread and secured, her waist locked by the metal cincher. Only her head could turn slightly; all other parts of her body were trapped, utterly exposed, utterly helpless. "Test begins," he picked up the remote and pressed a button. The internal vibrator of the waist cincher activated, on medium setting. A continuous vibration emanated from within, directly targeting her sensitive areas. She wanted to curl up, but the straight-arm restraint forced her chest out, preventing any bending. She wanted to bring her legs together, but the ankle restraints kept her immobile. She wanted to use her hands to block, but her arms were completely fixed behind her back, unreachable. "Ah... coming... almost there..." she trembled, her body spasming within the multiple restraints. But each restraint limited her movements, allowing only small tremors, preventing any true release or escape from the stimulation. "No going," he commanded. "Today, for twenty-four hours, Teacher must remain on the edge, bound, vibrating, controlled, but not climaxing, until I say so. This is the European straight-arm restraint training, to teach Teacher how to control her body, her desires, her reactions within the strictest of restraints." He sat in a nearby chair, began reading a book, glancing at her occasionally, adjusting the vibrator's intensity. Sometimes he set it to a low level, keeping her on the brink of pleasure, neither here nor there, an agonizing torment. Sometimes he suddenly cranked it to high, bringing her to the verge of climax, only to lower it again, stopping her at the very last moment. Time ticked by. After an hour, her arms began to ache. The forced extension of the straight-arm restraint fatigued her muscles, impeded blood circulation, and her fingers grew slightly numb. After two hours, the leg restraints caused pain in her ankles, and the spread position tensed her thigh muscles. After three hours, the continuous vibration of the waist cincher left her drenched in sweat. The ropes, soaked with perspiration, darkened in color and clung more tightly to her skin. At noon, he fed her. But with her arms fixed behind her back, she couldn't use her hands and had to eat directly from his hand like an animal, a humiliating experience. Drinking water was similar; he fed her from a cup, and she tilted her head back, water dribbling down her chin and onto her chest, unable to wipe it away. In the afternoon, the vibrator suddenly intensified, on high. The powerful vibrations made her scream, her body shaking violently. The ropes rubbed against her skin with her tremors, adding extra stimulation and pain. She finally climaxed, the first time, unable to control it within the extreme restraints. But he didn't stop. The vibrator continued, forcing her into repeated orgasms – a second, a third, a fourth... Her consciousness blurred, her body convulsed. The ropes dug into her flesh, leaving deep red marks, while the metal waist cincher gleamed coldly in the moonlight. In the evening, he released her leg restraints, but the straight-arm restraint remained, even reinforced with more ropes, making her arms even more fixed, even more immobile. Then, he had her kneel on the floor, her arms still bound straight behind her back, a posture of punishment, a pose of submission. "Now, the final six hours," he announced. "Teacher will remain kneeling like this, arms fixed straight behind her back, the waist cincher continuing to vibrate, until tomorrow morning. This is the final training, to make Teacher completely accustomed to the European straight-arm restraint, completely accustomed to being unable to move, completely accustomed to belonging to me." She knelt on the floor, her arms forcibly extended and fixed behind her back, her chest pushed out, her waist locked by the metal cincher. The internal vibrator pulsed continuously. She couldn't lie down, couldn't curl up, couldn't protect herself. She could only maintain this extremely exposed posture, enduring torment between pain and pleasure, sinking into submission between restraint and release. Twenty-four hours passed before he finally released the straight-arm restraint. Her arms were numb, unable to be lowered immediately. Her muscles were stiff, requiring him to massage them, to restore circulation. Neat rope marks remained on her arms, like a tattoo, a brand, a permanent memory. "Today's session is over," he said, his voice gentle. "Teacher did very well, enduring twenty-four hours of European straight-arm restraint, enduring continuous orgasms, enduring the torment of complete immobility. From now on, this will be the norm. Teacher will always be bound, always locked, always mine." She lay in his arms, her arms aching, her body bruised, her body sweaty, but a strange sense of satisfaction welled up within her. She knew this was her destiny, her eternity, her everything.