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elryuse · 17 days

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Hey man good day,

I was thinking if you can feature Stayc's J for a yandere fic? Plus she's already on legal age and I haven't seen much StayC fics or smut that much so..

So the setting would probably be, a stepsister yandere? Thanks! 🍻

The Dark Descent Into Madness

Yandere Stepsister J X Male Younger Stepbrother Reader (Slight Smut)

J hummed along to the catchy tune playing in her studio, her voice a breathy whisper as she recorded her latest track. Sweat slicked her forehead, the air thick with the concentration that birthed chart-topping hits. Suddenly, a sickening thud echoed through the door, followed by a string of obscenities.

Panic jolted through her. J scrambled to her feet, heart pounding a frantic rhythm against her ribs. The door splintered inwards, revealing three burly figures leering at her. Fear coiled in her gut, sharp and cold. These weren't fans; their eyes held a predatory gleam that sent shivers down her spine.

Just as one of them lunged, a blur of fury materialized in the doorway. It was Y/n, her younger stepbrother, his face contorted in rage. He fought with a desperate ferocity honed by years of protective instincts towards his famous sister. But he was outnumbered, and soon, the tide turned.

J watched in horror as Y/n crumpled to the floor, a sickening crack echoing as his arm took a brutal blow. One of the men grabbed her, a cruel smirk twisting his lips. But before he could touch her, a primal scream ripped from her throat.

She lunged for a discarded microphone stand, the heavy metal a blur in her trembling hands. With a strength born of terror, she slammed it into his knee, the sickening crunch of bone music to her ears. The man howled in pain, his grip loosening. J didn't hesitate. She grabbed a stray phone charger, its cord a threatening whip, and lashed out at the remaining figures.

They weren't expecting such a ferocious counterattack from the seemingly delicate idol. In the ensuing chaos, Y/n managed to crawl towards a fire extinguisher. With a desperate heave, he unleashed a white cloud, momentarily blinding the attackers. It was their chance.

They scrambled out of the studio, the acrid smoke stinging their lungs. J slammed the door shut, collapsing against it, gasping for breath. Her bravado evaporated, leaving behind a trembling wreck. Hot tears streamed down her face as she rushed to Y/n's side.

He was a mess, his clothes torn, face bruised and bloodied. A choked sob escaped her lips as she cradled his head in her lap, wiping away the crimson blooming on his cheek. "Y/n, my Y/n," she whispered, her voice thick with terror and something else, a possessiveness that sent a tremor through her own body.

He winced as she gently cleaned his wounds, his gaze lingering on her a little too long. J felt a familiar warmth bloom in her stomach, a heat fueled not just by relief but by a primal urge to keep him safe, always.

The following days were a blur of doctor visits and hushed conversations. But beneath the surface, a storm brewed within J. The incident had ignited a possessive fire in her. The thought of any woman by his side, sharing his laughter, his touch, sent a tremor of jealousy through her.

One evening, Y/n came home late, a faint trace of perfume clinging to his clothes. J's heart hammered in her chest. He was supposed to be with her, not out with some nameless girl.

"Hey, J Noona" Y/n mumbled, a sheepish grin on his face as he saw her steely glare. "Sorry I'm late. Me and Sarah… uh… we just went to grab some food."

The name sent a spike of anger through her. "Sarah, huh?" J's voice was a low growl.

Y/n's smile faltered. "Noona, what's wrong?"

"What's wrong?" She slammed a photo on the table, the picture of a beaming Y/n with a pretty brunette plastered all over him. "You were supposed to be hanging out with me, remember?" There was a dangerous edge to her voice.

Y/n paled, his eyes widening. "Noona, it's not what it looks like. We were just…"

"Just what?" J cut him off, her voice a chilling whisper. The air crackled with unspoken tension.

Before he could reply, she was on him, her lips crushing against his in a searing kiss. It wasn't a kiss of affection, but of dominance, a desperate claim. Y/n froze, caught off guard by the sudden aggression.

J poured all her emotions into the kiss, her possessiveness, her fear, her need to feel him close. Her hands roamed his body, a stark contrast to the gentle way she usually touched him.

A gasp escaped Y/n's lips. His initial shock melted away, replaced by a response that sent another jolt through J. He kissed her back, his own hands finding purchase on her hips, pulling her closer.

The kiss deepened, a tangle of tongues and The air grew thick and humid, the scent of adrenaline and something altogether more primal clinging to them. Y/n, fueled by a desire he couldn't quite understand, deepened the kiss, his hand slipping beneath the hem of her oversized shirt, sending shivers down her spine.

J gasped, a mixture of surprise and a jolt of pleasure arcing through her. She explored his face with her hands, tracing the sharp angles of his jaw, feeling the stubble that prickled delightfully against her palm.

One of his hands moved up her back, sending a spark of heat igniting at the base of her spine. He fumbled with the clasp of her bra, a clumsy urgency in his movements that sent a thrill through her. The cool air on her exposed skin was a stark contrast to the burning heat rising within.

She pulled back slightly, her eyes glazed with desire. "Y/n," she breathed, her voice barely a whisper.

He stared at her, his own eyes heavy with a mix of confusion and something akin to desperateness. "Noona," he murmured, his voice thick. "I…"

But before he could finish his thought, she cut him off, her voice husky with barely contained desire. "Don't think," she whispered, her fingers trailing down his chest, sending shivers cascading down his body. "Just Enjoy."

With a groan, he pulled her flush against him, his lips finding a sensitive spot on her neck, sending sparks dancing across her skin. He trailed kisses down her collarbone, each touch a searing brand.

Suddenly, a sharp knock on the door shattered the heated atmosphere. J froze, her breath catching in her throat. Y/n pulled away, his chest heaving, his eyes searching hers.

"J?" came a muffled voice through the door. "It's Lia, are you alright?"

J cursed under her breath. It was her manager, always at the most inconvenient times. With a sigh, she pushed Y/n away, a wave of frustration washing over her. The moment was broken, the forbidden thrill hanging heavy in the air.

"J-Just a minute, Lia-nim" she called back, forcing a smile. She ran a hand through her hair, trying to appear composed.

Lia's voice came again, laced with concern. "Is Y/n there too?"

J hesitated. How much could she explain without raising suspicion? "Yeah, he's just… checking on my wounds," she lied, hating the lie even as it left her lips.

"Alright, dear. Just remember, you have a photo shoot tomorrow. Get some rest," Lia said, before her footsteps faded down the hallway.

J turned back to Y/n, a mixture of frustration and a flicker of desperation swirling in her eyes. "We can't… not now," she said, her voice barely a whisper.

"No," Y/n breathed, his own frustration mirroring hers. He stepped closer, his voice husky. "But we can't let this end either."

He leaned down, his lips hovering tantalizingly close to hers. "We'll find a way, Noona. We have to."

The promise hung heavy in the air, a silent pact forged in the aftermath of danger and ignited by a forbidden desire. As they embraced, the taste of her fear and his possessiveness lingered, a twisted yet intoxicating flavor that promised a dark and thrilling path ahead.

Days bled into weeks, a simmering tension hanging thick in the air between J and Y/n. They stole stolen glances, lingering touches, their forbidden passion a secret language only they understood. Sarah's name became a trigger, sending a tremor of possessiveness through J and a pang of guilt through Y/n.

One evening, after a particularly charged encounter that left them both breathless, J decided to take matters into her own hands. "Y/n," she started, her voice husky, "We can't keep doing this. Sarah… she's a threat."

Y/n stared at her, the guilt in his eyes turning to a flicker of understanding. "I know," he confessed, running a hand through his hair. "But, what are we supposed to do Noona?"

A cold glint flickered in J's eyes. "There's only one way," she said, her voice devoid of emotion. "Sarah can't be a part of this anymore."

Y/n's breath hitched. "N-noona, no. You can't…"

"Yes, I can," she interrupted, her voice gaining a steely edge. "For us, Y/n. Don't you see? We can't have a future together if she's still around."

The weight of her words settled on Y/n like a leaden weight. The possessiveness that had initially scared him now felt… comforting. He loved J, a twisted, forbidden love born from shared danger and stolen moments. The thought of losing her was unbearable.

"Alright," he finally whispered, a knot forming in his stomach. "But how?"

J leaned closer, a predatory glint in her eyes. "Leave that to me Love," she purred, her touch sending shivers down his spine. "You just need to trust me."

The following days were a blur of meticulous planning. J, fueled by a terrifying mix of love and possessiveness, orchestrated a seemingly accidental "leak" of Sarah's schedule. The fear in Y/n's eyes every time he looked at her fueled her resolve.

The night of Sarah's "accident" arrived, a storm mirroring the turmoil in J's heart. Y/n paced the room, worry etched on his face. J squeezed his hand, her touch surprisingly cold.

"It'll be alright Love, " she whispered, a lie heavy on her tongue.

The news report crackled to life, announcing Sarah's "tragic" car accident. Y/n blanched, his hand trembling in hers. J held him close, murmuring empty words of comfort, while inside, a chilling satisfaction bloomed.

The aftermath was a whirlwind of grief and fake condolences. J played the part of the devastated friend flawlessly, the guilt a dull ache in the pit of her stomach. But as Y/n held her close, his grief laced with a newfound dependence on her, the ache faded, replaced by a chilling emptiness.

Weeks turned into months, the memory of Sarah fading with each passing day. J and Y/n's bond deepened, their forbidden love blossoming in the darkness they had created. The guilt still lingered, a phantom limb, but it was overshadowed by the intensity of their twisted passion.

One evening, as they lay entangled in each other's arms, Y/n whispered, "J Noona, I love you. More than anything."

A ghost of a smile played on J's lips. "I love you too, Y/n," she murmured, her voice laced with a possessiveness that chilled him to the bone. "And together, we'll be unstoppable."

In that moment, Y/n realized the full weight of his choices. He was trapped, a willing prisoner in J's web of love and fear. But as he looked into her eyes, a terrifying truth dawned on him – a part of him, a dark, twisted part, craved this forbidden love, this chilling future they had built on the ashes of another life.

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