⋆˚꩜｡FRUSTRATION ⋆˚꩜｡
pairing: Stepbro! taehyun x fem reader
tags/warnings: explicit nsfw (mdni), fem reader, mutual masturbation, sexual frustration, step-sibling taboo, voyeurism
Wc: 1.2k
You swore the connecting door had never mattered.
It was just an architectural quirk in the house your parents bought after they got married. Two bedrooms, once a shared office or suite, divided now by a painted-over doorway with twin locks on either side. Yours stayed locked. So did his.
And for the most part, it stayed forgotten.
Until the nights you could not make yourself cum.It had started weeks ago. Quiet, half-hearted attempts with your fingers tucked under the sheets, soft brown thighs clenching with frustration. You knew how your body worked. You were not inexperienced. But something was off. You would chase the edge, feel it build, then feel it stutter and slip right out of reach. Again and again.Sometimes you gave up early, bitter and achy.
Sometimes you kept going, long past the point of pleasure, too stubborn to stop. You didn't think anyone could hear. But the walls were thinner than you realized. And tonight, unfortunately, your stepbrother Taehyun had no headphones.
He hadn't meant to listen. But once he noticed, he could not stop hearing it.
The quiet whimper through the wall. The shift of your bedsheets. The telltale rhythm of fingers between slick folds.
He shouldn't know what that sounds like.
He especially shouldn't know what his stepsister sounded like.
But he did. Every other night he suffered through it. He tried not to. He bought expensive noise-canceling headphones, gamed, anything.
Yet he ended up hard and restless, waiting until you finally gave up so he could jerk off in peace.
Only this time, you did not stop. You kept going. And going. And going.
He lay on his back, arm thrown over his eyes, trying to will himself not to listen. But your little gasps came steady and soft, almost broken. Like you were close. Like you needed it. Like you could not quite reach it.
Something in him snapped.
You heard the knock and sat bolt upright.
Panic shot through your chest as you scrambled for your panties and shorts and yanked a blanket over your body.
"Yeah?" you called, voice high and guilty.
"It's me," came the low voice. "Can I come in?"
You blinked. "Through the door?"
A pause. "Yeah." You stared at the handle.
Frozen.
You and your stepbrother Taehyun did not do this.
You did not hang out like that. You weren't exactly close. Not in that way. But your fingers were still damp from between your thighs, your heart was pounding, and your curiosity had already outpaced your shame.
You crossed the room barefoot and cracked the lock. The handle turned slowly.
And then he was standing in the doorway.
No shirt. Sweaty collarbones gleaming under the low light. Flushed cheeks and mussed hair. His chest rose and fell like he had been pacing for hours. His gaze met yours, and he looked absolutely wrecked.
"Jesus," you whispered. "Are you okay?"
"I was fine," he said, breathless, "until I had to listen to that for thirty minutes."
Heat flooded your face. "What are you talking about—"
"You're terrible at it."
You gaped. "Excuse me?"
He took a step inside, shutting the door behind him with a quiet click."You keep chasing it too hard," he said calmly. "You rush the beginning. And you forget to breathe when it gets close. That's why you can't finish.
"You stared, open-mouthed. "Why do you know that?"
"I could hear it," he said, voice low. "All of it."
Your legs suddenly felt weak. Taehyun glanced down, jaw tight.
"You don't have to feel embarrassed."
"That is not helping," you snapped, heat crawling up your neck.
"I could help you," he said. Your breath hitched.
"What?"
He stepped closer."I could teach you how to feel."
Silence thickened between you. He was not teasing. He was not smiling. He looked angry, but not at you. Like he was barely holding himself back.
"What does that mean?" you asked.
"It means," he said slowly, "you sit on the bed. I'll sit across from you. You touch yourself. I guide you. Tell you when to slow down, what to focus on. I can touch myself too, if you want. We don't have to do more than that."
Your heart thundered in your ears.
"You want to do that?" you asked, not quite believing it.
"I need to," he muttered. "I have been hard for almost an hour listening to you fail at it."
You let out a tiny breath of disbelief, then slowly backed toward the bed.
Taehyun moved like he was afraid you would change your mind. He sat in your desk chair across from the edge of your bed, elbows on his knees, face serious."Take off your shorts," he said softly. "Keep your shirt on. Just get comfortable."
Your fingers trembled slightly as you pushed the fabric down your hips. You slipped onto the bed. The angle gave him a clear view of your panties clinging to your dark, glistening folds. He could see the dampness on your skin even in the low light.
"God," he muttered. "You are really worked up."You swallowed and glanced down. "I don't know what is wrong with me. I just can't."
"You can," he said firmly. "You just need help."His hand moved to his own lap, palming himself slowly through his sweatpants. You heard the soft catch in his breath."Start slow," he murmured. "Not just rubbing. Touch yourself everywhere. Over your panties. Just feel it."
You did. You let your hand trail over your stomach, between your warm thighs, pressing lightly. The fabric was soaked. Taehyun let out a low exhale when he saw.
"no rushing it," he said. "don't chase it yet. Just let it build."
You circled your clit gently, carefully. Your legs shifted. The tension grew deeper, fuller, heavier.
"Like that?" you breathed.
"Yeah," he said, voice strained. "Exactly like that."
You peeked at him. He had pulled himself out now, hand wrapped around his cock. Long, hard, the pretty pink tip flushed deep. He stroked slowly, never taking his eyes off you."Now under," he said. "Take them off."
You obeyed. He watched your hand slip between your legs again, skin on skin. You let out a shaky moan as your fingers met your slick heat."Feels better now, right?"
You nodded, breath catching."Don't speed up yet. Let it get heavy. Pinch your nipples a bit."
You did. The way he watched you made your stomach flutter. You traced a hand up under your shirt, lightly twirling the dark peaks of your nipples as your fingers circled tighter inside you. You hit the spot just right, and your hips lifted instinctively.
Taehyun cursed softly. His pace quickened."Faster now," he murmured. "you're ready."
Your fingers moved faster, pressure building, slick sounds filling the space between you. He looked wrecked, jaw slack, hand pumping his cock in time with yours
"Fuck," he whispered. "I'm not gonna last."
Your own pulse screamed now. Your legs trembled, thick brown thighs twitching.
"I think I—" you gasped. "I think I am close."
"Keep going," he said. "Don't stop. Let it happen just like that. Fuck, you look so pretty."
The orgasm hit like a wave.
You cried out, back arching, legs seizing as pleasure ripped through you. Your fingers kept moving, hips rocking through it, sobbing his name without thinking.
Taehyun groaned deep in his chest, head thrown back. "Fuck, fuck, fuck—" he gasped. "Gonna—fuck—"You looked up through your lashes just in time to see his face contort as he came, hand jerking over his cock, white streaks painting his bare stomach. He moaned your name like a prayer, low and aching.
Silence settled again.
Only your panting filled the room.
You collapsed back on the bed. He sat hunched, chest heaving, sweat at his temples.
Finally, he whispered, "Told you I could help." You laughed, breathy and disbelieving, still a little dazed. "Yeah," you said. "You really did."