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elryuse · 15 days

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Yandere older sister Chengxiao x younger brother reader she obsessed with him and never wants him to leave her and stay with her forever with smut

FORBIDDEN DESIRE

Yandere Older Sister Cheng Xiao X Male Younger Brother Reader (Slight SMUT)

Y/n stared at the muted television, the blaring K-pop music a distant hum in his ears. Images of his sister, Cheng Xiao, flashed across the screen, her flawless face and captivating dance moves mesmerizing millions. Yet, to Y/n, she was just a stranger with a familiar face.

Cheng Xiao had been a whirlwind of fame ever since she debuted as a K-pop idol years ago. Their childhood memories were fragmented at best, stolen by her relentless training and packed schedules. He barely remembered the warmth of her hugs, the sound of her laughter, replaced by hurried goodbyes and forced smiles.

A pang of loneliness tightened his chest. He missed her, the sister he barely knew. But whenever he tried to bridge the gap, he was met with a polite smile and a dismissal disguised as work commitments.

Suddenly, a news alert blared on the screen, shattering the silence. It was a report about a car accident involving Cheng Xiao. Y/n's heart lurched into his throat. The details were blurry, but one sentence slammed him to his core: "critical condition, emergency surgery."

Panic clawed at him. He scrambled to his feet, phone clutched tightly in his hand. He dialed Cheng Xiao's number repeatedly, each unanswered ring a hammer blow to his chest. Finally, a voice, unfamiliar and strained, picked up. It was their aunt, informing him about Cheng Xiao's urgent need for a kidney transplant.

Y/n didn't hesitate. He volunteered, a wave of protectiveness washing over him. It was the least he could do for the sister he barely knew. The surgery was a blur of anxiety and hope. Days turned into weeks as Y/n recovered in the sterile hospital room. He barely slept, his mind constantly checking on Cheng Xiao in the adjacent room.

One day, the door creaked open revealing a pale, gaunt Cheng Xiao. Her eyes, usually sparkling with life, were dull and shadowed. But when they landed on him, a flicker of recognition ignited within them. Tears welled up in her eyes, spilling down her cheeks as she choked out, "Y/n… you saved me."

Her voice, usually strong and confident, was a broken whisper. Y/n felt a surge of warmth bloom in his chest. This was Cheng Xiao, vulnerable and real, a stark contrast to the distant K-pop idol on the screen.

From that day on, a change swept through their relationship. Cheng Xiao, discharged from the hospital, made a conscious effort to connect. They spent evenings watching movies, Y/n patiently explaining the plot points lost due to her years in Korea. She cooked for him, her laughter filling the once-silent apartment with a melody he never knew he craved.

One night, as they sat on the couch, a comfortable silence settling around them, Cheng Xiao reached out and took his hand. Her touch sent a jolt through him, a spark of something unfamiliar. He looked into her eyes, expecting warmth, but found a possessive glint that sent shivers down his spine.

"Y/n," she started, her voice a husky whisper, "You saved my life. You're my hero."

He smiled, his heart stuttering in his chest. "We're siblings, Cheng Xiao. That's what siblings do for each other."

But her grip tightened, her gaze burning into his. "No, Y/n," she breathed, her voice laced with a possessiveness he couldn't decipher. "You're mine. You gave me a part of yourself, and now I want all of you."

Y/n's smile faltered. He stammered, trying to pull his hand free. "Cheng Xiao, what are you saying? This isn't… this isn't right."

But she wouldn't let go. Her eyes, once filled with gratitude, now flickered with a manic intensity. "You saved me, Y/n," she insisted, her voice thick with emotion. "Now, let me save you. Let me be the only one you need."

Fear, cold and sharp, snaked its way into Y/n's gut. He tried to reason with her, to explain the boundaries between siblings, but her words fell on deaf ears. The sister he yearned for had morphed into something dark and possessive.

The nights that followed were a chilling descent into madness. Walls seemed to close in, the once-comfortable apartment transformed into a gilded cage. Cheng Xiao became clingy, her affection suffocating. She'd follow him around the house, her gaze an unnerving constant.

One night, Y/n woke up to the faint scent of lavender, his sister's favorite. He sat up, heart hammering in his chest, as he saw a dark figure leaning over him. It was Cheng Xiao, her eyes gleaming in the moonlight, a seductive smile playing on her lips

Y/n's breath hitched in his throat. Panic clawed at him, but before he could even stammer a protest, Cheng Xiao's lips were on his. The familiar scent of lavender mingled with the sweetness of her lip gloss, sending a confusing jolt through him.

The kiss wasn't gentle; it was desperate, possessive. Her hand snaked around his neck, her fingers digging into his skin as she deepened the kiss. Y/n froze, his mind in a war between confusion and a primal instinct to respond.

He tasted her fear, a strange undercurrent beneath the sweetness of her cherry lip balm. It was a fear that mirrored his own, a fear that twisted into something else entirely. He found himself responding, his hand hesitantly reaching for her waist.

Cheng Xiao moaned into the kiss, a sound that sent shivers down his spine. It was a sound of hunger, a yearning so intense it scared him. He pulled back slightly, gasping for breath. Her eyes, usually sparkling with mischief, were now dark and hungry, her gaze fixed on him with an intensity that made him feel like prey.

"Y/n," she whispered, her voice thick with emotion. "Don't leave me. You're mine now. We're connected, you and I."

He wanted to argue, to explain the lines she was crossing, but the words wouldn't come. He was trapped in the storm of her emotions, caught in the headlights of her obsessive gaze. Before he could find his voice, her lips were back on his, this time softer, more seductive.

She explored his mouth with a newfound urgency, her touch igniting a fire within him he couldn't explain. Her hand trailed down his chest, sending shivers down his spine. His own inhibitions crumbled like sandcastles under a tidal wave. He was drowning in her touch, a prisoner of his own conflicting emotions.

He found himself kissing her back, his own hands roaming her body, a desperate attempt to make sense of the situation. He felt a mixture of guilt, fear, and a strange, exhilarating thrill. The lines were blurring, and he wasn't sure he had the strength to fight the current.

The kiss escalated quickly, their clothes becoming an obstacle they both desperately wanted to remove. Cheng Xiao, fueled by a feverish obsession, undressed him with trembling hands. He was her savior, her hero, and now, she possessed him completely.

The night was a blur of tangled limbs and stolen breaths. Cheng Xiao devoured him with a frenzy that left him breathless and weak. Every touch, every kiss, was laced with a possessiveness that sent shivers down his spine. He felt like a doll in her hands, manipulated to fulfill a twisted desire.

When dawn finally broke, painting the sky with streaks of orange and pink, Y/n lay sprawled beside her, utterly drained. He felt a deep ache in his muscles, a physical manifestation of the emotional turmoil he couldn't process.

Cheng Xiao, on the other hand, seemed radiant. Her eyes glowed with a dark satisfaction, as if she had finally claimed what was rightfully hers. She cupped his face, her thumb tracing the line of his jaw.

"See, Y/n," she murmured, her voice laced with a chilling sweetness. "We fit perfectly. You'll never want to leave me now, will you?"

Y/n tried to speak, to voice the unease churning in his stomach, but no words came out. He was trapped, caught in the web of her twisted affection. As the days blurred into weeks, the nights became a relentless cycle of passionate encounters.

Cheng Xiao became clingy, her possessiveness reaching suffocating levels. She'd monitor his every move, his phone calls, his texts, a jealous glint in her eyes whenever he interacted with another girl.

"They don't understand you," she'd hiss, her voice dripping with venom. "Only I understand the bond we share. We're more than siblings, Y/n. We're one."

Y/n, exhausted from the emotional and physical toll, felt himself withdrawing. He craved normalcy, the company of friends, a life outside the suffocating walls of their apartment. But every attempt to break free was met with a silent storm of tears and accusations.

He was her lifeline, the living embodiment of her gratitude, a twisted version of love that kept him tethered to her side. He was a prisoner in a gilded cage, a trophy on her shelf, a possession she refused to share.