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Jun 26, 2025

Can I request Lee chaeyeon x male reader cheating smut where the reader goes over to chaeryeong's place to see her off for a trip and things get frisky in the bedroom but he doesn't realize he's got the wrong sister until it's too late

You F' My Sister?!

Lee Chaeyeon, Lee Chaeryeong x Male Reader

4.4k+ A/N: I don't know how you want the ends, but I assumed from "until it's too late" you want it a dark ending huh, please keep notice that this story was pure fiction... and before you hope... no, it's not threesome.

It's a Saturday night, Chaeyeon is sprawled on the couch, her legs draped over your lap, her hair loose and slightly messy from a long day.

She's wearing one of your old T-shirts, oversized and slipping off one shoulder, and a pair of soft shorts.

She's laughing at something silly you said, her eyes crinkling, her smile bright and teasing. "You're such an idiot," she says, nudging you with her foot.

"Am I?" you grab her ankle and giving it a playful squeeze. She squeals, swatting at you.

You're leaning over her, pinning her gently to the couch, her laughter bubbling up as she pretends to fight you off. Her hands playful push at your chest.

"Get off, you're heavy," she teases, but her hands slide up to your shoulders, pulling you closer instead. You grin, leaning down to kiss her, and her lips meet yours, soft and warm, tasting faintly of the strawberry lip balm she loves.

Your kiss starts light, a brush of lips, but it deepens quickly, her fingers tangling in your hair, her body arching slightly under you. The playlist fades into the background, and all you can hear is the soft hitch in her breath, the way she sighs into your mouth.

"Chaeyeon..." you whisper against her lips, your voice low.

She hums in response, her hands slipping under your shirt, tracing the lines of your back. Her always thrilling, and you can feel the heat building between you.

You pull back just enough to tug her T-shirt up, revealing the smooth skin of her stomach, and your hands roam over her, savoring every inch.

She arches into your touch, her eyes dark with want, her lips parted as she watches you.

"Bedroom?" you ask, your voice rough, but she shakes her head, a mischievous glint in her eyes.

"Here," she says smiling, pulls you back down, kissing you harder.

You don't argue, your hands sliding to her shorts, tugging them down along with her panties in one smooth motion. She gasps as the cool air hits her skin, but her leg's part, inviting you closer.

Your fingers find her pussy, already wet, and you tease her gently, circling her clit with slow, deliberate strokes. She moans, her head tipping back against the couch, her hips rocking into your hand.

"Fuck, babe..." she breathes, her voice trembling with pleasure, and you lean down to kiss her neck, sucking lightly at the sensitive spot just below her ear.

Her moans grow louder, her hands gripping your shoulders as you slide a finger inside her, then another, curling them to hit the spot that makes her gasp.

She's so responsive, her body moving with yours, and you can feel your own arousal building, your cock hardening in your pants.

She reaches for you, her hands fumbling with your belt, impatient and needy. "Off," she mutters.

You help her, shoving your pants and boxers down, your cock springing free. She wraps her hand around you, stroking slowly. You groan, kissing her deeply, your tongues tangling.

You position yourself between her legs, lift one of her thighs, hooking it over your hip to open her up, and she guides you to her entrance, her eyes locked on yours.

You push into her slowly, savoring the way her pussy grips you, warm and tight. She moans, her nails digging into your back, her hips meeting your thrusts. "God, yes..." she whispers.

You start moving, a steady rhythm that has her gasping with each thrust. You kiss her neck again, nibbling and sucking, leaving faint marks as you fuck her, the couch creaking beneath you. Her moans fill the room, blending with the soft music, and you can feel her getting close, her body tightening around you.

"Chaeyeon..." you groan, your thrusts growing faster, harder, as you chase your own release. She clings to you, her legs wrapping around your waist, pulling you deeper.

"I'm gonna..." you start, but she cuts you off with a desperate kiss, her body shuddering as she cums, her pussy pulsing around you.

"Fuck...!" you pull out just in time, your cum release warm, spilling across her stomach.

You collapse beside her, both of you panting, her head resting on your chest. She laughs softly, her fingers tracing lazy patterns on your skin.

"I love you," she murmurs, her voice warm and content, and you kiss the top of her head.

"I love you too," you say, pulling her closer. The night feels perfect, a moment of your pure connection with her.

Someday on Thursday.

"Hey, babe?" Chaeyeon's voice calling you through from your apartment's kitchen

You set down your phone and walk over, leaning against the doorway. She's standing by the counter, chopping vegetables for dinner, her hair tied back in a messy bun. Even after four years together, the sight of her like this, casual, comfortable, makes your chest warm.

"Yeah?" you ask, smiling.

She glances up, her eyes meeting yours, "Chaeryeong needs us to look after her. She's going on that trip, and her suitcase is too small. She needs my bigger one. Can we swing by her apartment tonight to drop it off? She might also need a ride to the airport, and someone must stay at her apartment waiting for her delivery package to sign, and I'm playing the big sister again."

You nod, not surprised. Chaeryeong, Chaeyeon's younger sister, is just a year apart from her, and the two are as close as sisters can be, practically a twin, inseparable. You've known Chaeryeong almost as long as Chaeyeon, and her family feels like yours after all these years, dinners, holidays, late night talks. Her parents already call you their son in law, and you're comfortable in their world.

They're look so alike, same sharp cheekbones, same warm eyes, that early in your relationship, you'd sometimes mix them up, especially from a distance. It led to some awkward moments, but Chaeyeon always laughed it off, teasing you about needing glasses.

Now, you know the difference, maybe. Chaeyeon's got playful spark, the way her smile quirks up. Chaeryeong's got quieter, softer, more thoughtful.

"Sure," you say, stepping closer. "You driving her to the airport, or am I?"

"I'll drive," Chaeyeon says, setting the knife down and wiping her hands on a towel. "She's stressing about packing, so I figured we could bring the suitcase over and help her out. You good with that?"

"No problem," you reply, noticing the slight tension in her shoulders.

She's been juggling work and early wedding plans, and it's starting to show.

You move behind her, wrapping your arms around her waist and resting your chin on her shoulder. "You okay, though? You seem... off."

She leans back into you, her hands covering yours. "Just tired," she says quietly. "Work's been crazy, and Chaeryeong's been texting me nonstop about this trip. Plus, the wedding stuff... it's a lot."

You kiss the side of her head, feeling her relax a little. "We’re in this together, alright? Let's get Chaeryeong sorted, then we'll have a chill night. Maybe watch that movie you've been telling me about."

It's 7:00 PM, you and Chaeyeon pull up to Chaeryeong's apartment. You're carrying Chaeyeon's big black suitcase up the stairs.

Chaeryeong's door swings open before you knock, and there she is, hair a bit messy, a nervous smile pattern on her face. Chaeyeon's 'not really' twin.

"Hey, unnie, oppa," Chaeryeong says, stepping aside to let you in. "Sorry for dragging you guys here."

"No big deal," Chaeyeon says, dropping the suitcase, "How's your packing going?"

"Still on it," Chaeryeong admits, eyeing the suitcase. "I really need your suitcase, unnie. Mine's way too small."

"When's your flight?" Chaeyeon asks, already heading to the living room where clothes and toiletries are strewn across the couch.

"Eight thirty," Chaeryeong says, a hint of panic in her voice.

Chaeyeon groans. "Damn, that's so soon. Let's move it."

You watch Chaeyeon dive in, helping Chaeryeong fold clothes and cram them into the suitcase like a pro big sister.

Their voices blend with light teasing and quick directions, and you can’t help but smile.

You love how Chaeyeon's always there for her sister, even when she's stressed out herself.

Not wanting to just stand around, you start picking up stray stuff, a phone charger on the coffee table, sneakers by the door tidy them up. Chaeryeong's place is cozy but chaotic tonight, with her trip looming.

As Chaeyeon zips the suitcase shut, she glances at her watch, "Alright, we've got like twenty minutes to get you to the airport," she says, brushing her hair back. "You got everything?"

Chaeryeong nods, but her eyes dart around, double checking. "Think so. Thanks, unnie. Thanks, oppa."

"No problem," you say, flashing a reassuring smile. "Ready for this trip?"

She laughs nervously, "Not really. First time traveling alone, so... yeah."

"You'll be fine," Chaeyeon says, pulling her into a quick hug. "Text me when you land, okay?"

You grab the suitcase, ready to load it to the car, but Chaeyeon's phone buzzes. She pulls it out, frowning. "Work," she mutters, annoyed. "They need me to check something real quick. I'll be in the car, okay? Start moving." She steps into the hallway, already typing away, leaving you and Chaeryeong alone.

You lift the suitcase, and Chaeryeong opens the door, her movements quick, "Thanks for the help." she says softly.

"No worries," you say, smiling. "Let's get you to the airport."

It's past 8:30 PM, and you're slouched on Chaeryeong's couch, watching some action flick on the TV. The living room's cozy, lit by the TV's glow and a small corner lamp.

You stayed behind after Chaeyeon dropped Chaeryeong off at the airport, waiting for a delivery package that supposed to come, and waiting Chaeyeon back so you can head home together.

You check your phone. You texted Chaeyeon earlier: 'How's it going?' but no reply.

You're not too worried, she's been slammed with work and wedding planning. Probably stuck in traffic or dealing with that work call. Still, you miss her vibe, her teasing grin, and you're itching to see her.

Chaeryeong's coffee stash is empty, and you need some caffeine to stay awake. You decide to hit the convenience store a few blocks away. Grabbing your jacket and locking up, you step into the chilly night air.

At the store, you grab instant coffee, popcorn, and Chaeyeon's favorite chocolate biscuits. You check your phone at the counter, still no reply. A flick of worry hits, but you brush it off. She's fine.

Back at the building, you spot Chaeyeon's car parked neatly in its usual spot. You grin, she's back.

Climbing the stairs, snacks in hand, you picture her sprawled on the couch, ready to rib you for taking so long.

You unlock the door and step inside, the TV still on.

"Babe?" you call softly. No answer. The living room's empty, and you frown.

A faint rustle comes from the bedroom, Chaeryeong's bedroom. You head there to nudge the door open.

There's Chaeyeon, curled up on Chaeryeong's bed, her back facing you, hair spilling over the pillow.

She's in a loose sweater, breathing slow, like she's dozed off. Your heart softens. She's been so stressed, work, wedding plans, helping Chaeryeong. Seeing her like this, vulnerable, makes you want to take care of her.

You set the snacks on a table and climb onto the bed quietly, sliding in behind her.

You wrap your arms around her, spooning her, your chest against her back. You rest your chin on her shoulder, holding her close, hoping to ease her stress.

You start massaging her shoulders, your fingers digging into her tight muscles. She's all knots from stress, and you work carefully, not wanting to wake her but wanting to loosen her up.

Your thumbs move in slow circles along her shoulder blades, and her body relaxes a bit.

You smile, knowing she loves this. Your hands slide down, kneading her back through her sweater, then teasing along her sides, brushing closer to her sideboob but keeping it light.

She stirs, letting out a soft moan, and you feel her body respond. You lean in, kissing her neck, your lips tracing her soft skin.

"Babe..." you whisper, voice low. You gently turn her to face you. Her hair covers her face, but you brush it aside, fingers grazing her cheek.

You kiss her lips, soft and warm, tasting the sweet, fruity hint of her lip tint. The kiss starts tender but turns hungry, your love pouring out.

She stirs again, whispering, "Keep going..." her voice is soft, half asleep.

You kiss her deeper, your tongue brushing her lips. Your hand traces her side, sliding over her breasts through her sweater, keeping it playful but intimate. She sighs, her body melting into you, still half lost in exhaustion.

Then she turns away again, facing the other way like she's drifting back to sleep, but you're too turn on to stop.

Your hands find her breasts from behind, squeezing them gently through her sweater, and you kiss her neck, nibbling until she squirms.

Your hand slides lower, over her stomach, then to her thighs, feeling her warmth through her thin pants.

Your cock's getting hard, pressing against her lower back, and her subtle hip movements tell you she feels it.

Her hand reaches back, grabbing your dick through your pants, sending a jolt through you. She unzips you slowly, teasingly, slipping her hand inside to pull your boxers down, freeing your rock hard cock.

Her warm fingers wrap around your cock, stroking slowly, her rhythm deliberate and maddening, all while she stays turned away, her body pressed tight against yours.

You kiss her neck harder, sucking lightly, and your hand tugs her pants down, revealing her soaked panties.

Your fingers brush her pussy through her panties, feeling her wet heat, and she moans louder.

You slide your hand inside, touching her slick folds directly, fingering her with slow, careful strokes.

Her moans grow, her hips moving with your rhythm, her pussy getting wetter under your touch.

When she's wet enough, you push her panties aside, positioning yourself in the spooning position. Your cock brushes her entrance, and you slide in slowly, carefully, making sure she's comfortable.

She moans deeply, her body adjusting, her hips rocking slightly to take you in. You kiss her neck again, your lips and tongue tracing the sensitive skin just below her ear, your hand squeezing her tits, as you fuck her with a slow intimate rhythm.

Her moans grow louder, more desperate, and you can feel her body responding, her hips meeting your thrusts with a rhythm that’s both teasing and needy.

Gently, you lift her top leg, hooking it over your own to open her up further, you push deeper, your cock hitting her core with slow, deliberate thrusts that make her gasp. Her pussy clenches around you, wet and hot, and the sensation sends a jolt through your body.

"Fuck, babe..." you whisper against her neck, your voice rough with want, your lips brushing her skin as you suck and nibble, leaving faint marks she'll probably tease you about later.

Her hand reaches back, gripping your hip, urging you to keep going, "Don't stop..." her voice breathy,

You don't need to be told twice. Your thrusts pick up slightly, hitting that spot inside her that makes her moan louder, her body trembling against you.

Your hand slides from her thigh to her pussy, fingers finding her clit, rubbing slow circles that make her hips buck against you.

She's so wet, your fingers glide easily, and her moans turn into soft whimpers, her body surrendering to the pleasure.

You keep kissing her neck, your tongue flicking over her pulse point, tasting the salt of her skin.

You thrust deeper, feeling the pressure building in your core, the heat of her pussy pulling you closer to the edge.

"Chaeyeon..." you groan softly, your lips pressed to her neck, your hips moving faster now.

She moans in response, her hand tightening on your hip, her body arching into you. You can feel her getting close, her pussy tightening around your cock, her breaths coming in short gasps.

Your fingers on her clit move faster, matching the rhythm of your thrusts, and her moans turn into a desperate, "Fuck, I'm gonna..."

You're close too, you can't hold on much longer, it's too much.

You pull out just in time, your cock throbbing as you cum, "Babe...!" your release spilling across her lower and slightly onto her stomach, warm and sticky against her skin.

She gasps softly, her body still trembling from the edge of her own climax, her hips grinding back against you as if chasing the feeling.

You both catch your breath, still pressed together, your arm wrapped around her, holding her close. Your lips find her neck again, kissing softly now.

Her sweater is bunched up, her skin warm and slightly sweaty under your touch. You pull her tighter, spooning her, your softening cock resting against her back.

"Babe," you whisper, full of love. She hums, her hand reaching back to touch your face, her fingers grazing your jaw.

Suddenly, the bedroom lamp flicks on.

"What the fuck?!" a voice high, sharp and furious, cutting through the quiet like a knife.

It's Chaeyeon's voice, tied with shock and rage, "You fucked my sister?!"

Your eyes snap open, heart lurching into your throat. The woman in your arms stiffens, and as you pull back slightly, the reality hits you like a punch.

It's not Chaeyeon. It’s Chaeryeong.

Her face, now turned slightly toward you, is flushed, her eyes wide with panic and guilt, it's all Chaeryeong, and you realize you've made a terrible mistake.

You scramble back, you fumble to pull up your boxers and pants, "Chaeyeon, I...I thought it was you!" you stammer, your voice surge with panic.

Your eyes darts where Chaeyeon stands, her face a mix of disbelief and fury, her phone still in her hand from whatever work call she'd been dealing with.

Chaeryeong pulls her sweater down, yanking her pants up as she sits up on the bed, her face burning red, "Unnie, I... I didn't mean..." she starts, her voice trembling, but Chaeyeon cuts her off.

"Didn’t mean what?!" Chaeyeon's voice is sharp, she steps into the room. "You were just... God, I can't even say it!" she runs a hand through her hair, pacing, her breaths short and angry.

"I leave to grocery store for ten fucking minutes, and this is what I come back to? My sister? My fiance?"

Your stomach twists, "Chaeyeon, I swear, I thought it was you," you say, your voice desperate. "It was dark, and I... she didn't say anything, I thought..." you cut yourself off, realizing how weak it sounds.

The looked alike, the dim light, the familiar sweater, it all tricked you, but the weight of what just happened is crushing.

You look at Chaeryeong, who's staring at the floor, her hands clenched in her lap, silent but clearly shaken.

Chaeyeon's eyes flicker between you and Chaeryeong, her anger giving way to something else, hurt, maybe betrayal.

"You thought it was me?" she says, her voice lower now, trembling. "You didn't even notice? Four years, and you can't tell me apart from my sister?" her words cut deep, and you feel your chest tighten.

She turns to Chaeryeong, her expression softening slightly but still sharp. "And you... what the hell, Chaeryeong? Why didn't you stop him?"

Chaeryeong's voice is barely audible. "I... I don't know, unnie. I was half asleep, I thought... it was dream... I didn't think..." she trails off, her eyes glistening, and you can see the guilt eating at her.

You stand there, frozen, your mind searching for something to say, something to fix this, but nothing feels right. "Chaeyeon," you try again, stepping toward her, but she holds up a hand, stopping you.

"Don't," she says, her voice cold. "Don't speak to me. I don't even wanna see you anymore"

She glances at Chaeryeong, her expression a mix of anger and pain. "Or you."

She turns and walks out of the bedroom, her footsteps heavy in the hallway.

You burst out of the apartment, spotting her by her car in the parking lot, her arms crossed, staring at the ground. Her shoulders are tense, her face unreadable, "Chaeyeon!" you call, your voice hoarse, stumbling over your words as you approach.

"I... I didn't know, I swear. I thought it was you. It was dark, I was, fuck, I'm so sorry."

She looks up, her eyes glowing in pain, "You thought it was me?" she snaps. "You couldn't tell? My own fiance?" her words cut deeper than anything, "And Chaeryeong... God, why didn't she stop you? What the hell is wrong with both of you?"

"I don't know," you stammer, "I fucked up, okay? I thought I was with you. I would never... Chaeyeon, please." You reach for her, but she steps back, shaking her head.

"Don't touch me," she says, low and cold. "I can't do this right now." She turns, opening her car door, and you're left standing there, helpless, as she drives away.

You push open the apartment door. Chaeryeong is there, sitting on the couch, her knees pulled to her chest, her face pale and eyes red like she's been crying.

You stop a few feet away, "I thought you were at the airport, why are you here. And why the fuck didn't you stop me?"

She flinches at your tone, her eyes avoiding yours as she hugs her knees tighter, "My flight... it got delayed until tomorrow," she says quietly, trembling.

"They called me right after unnie dropped me off. So, I came back here, and I was so tired, I just... I went to lie down."

She pauses, swallowing hard, her fingers digging into her legs. "I didn't know you'd come back. I didn't know you'd think I was her."

"You didn't stop me," you say, your voice cracking with frustration. "I was touching you, kissing you, fuck, Chaeryeong, I was inside you, and you didn't say a word. Why?"

Her face crumples, and she buries it in her hands, her shoulders shaking. "I don’t know," she whispers, her voice barely audible. "I was half asleep at first, and then... I don't know, okay? I froze. I knew it was wrong, but I... I just didn't stop you. I'm sorry." Her words break, and she looks up at you, her eyes glistening with tears. "I didn't mean for this to happen."

You run a hand through your hair, pacing the small living room, trying to process it all. "Where was Chaeyeon this whole time?" you ask.

Chaeryeong wipes her eyes, her voice shaky. "After she dropped me off in front of the apartment, she said she had to run to the convenience store for something. I didn't think she'd be gone long. I didn't even know you were still here until..." She trails off, unable to finish.

You sink onto the couch, your head in your hands, "Fuck," you mutter, "She's never going to forgive me. Or you."

You want to fix this, to undo the last hour, but there's no going back. All you can do is face the mess you've made and hope Chaeyeon will hear you out.

Chaeyeon's hands tremble on the steering wheel, her vision blurred by tears that won't stop falling, her sobs filling the car. Her chest feels like it's caving in.

She can't shake everything she saw, and it's tearing her apart. Her phone buzzes again in the passenger seat, your name flashing on the screen for the fifth time, but she doesn't even glance at it. The sight of your name, once her anchor, now feels like a blade twisting in her gut.

"Why..." she mutters through her tears, grips the wheel harder.

"Why didn't you know it was her? Four years, and you couldn't tell? Am I that fucking replaceable?"

'You're supposed to know me, every part of me. How do you fuck up like that?" She wipes her face with her sleeve, but the tears keep coming, her breath hitching with every sob.

"And Chaeryeong..." she whispers, "Why didn't you stop him? Why didn’t you say something? You just let him... God, how could you?" The thought of her sister, her closest person in her life, lying there under you, responding to your touch, makes her stomach twist.

"We've shared everything, but not this. Not him. You knew he's mine."

She pulls over to a quiet street, her hands shaking too much to keep driving. Leaning her forehead against the wheel, she lets out a broken sob.

"I just went to the store for ten minutes. Ten fucking minutes. I was coming back to you, thinking we'd laugh, eat those stupid biscuits, plan our stupid wedding. And you're in there fucking my sister?" Her voice rises.

"I trusted you. I trusted both of you. How am I supposed to look at you now? How am I supposed to look at her?"

The morning sun spills over the horizon, you and Chaeryeong sit in a suffocating silence, your phone heavy with unanswered calls and texts to Chaeyeon all night.

Your phone rings, shattering the silence. It's not Chaeyeon, but an unknown number.

Your heart lurches as you answer, a calm but somber voice on the other end identifying themselves as Officer Park from the local police department.

"Are you the relatives of Ms. Lee Chaeyeon?" he asks, his tone professional but heavy.

You nod, "Yes, I am, what happened?"

"I'm sorry to inform you," he continues, "but there's been an accident. A vehicle registered to Ms. Lee was found at the base of a cliff on Route 47. There were no survivors."

The words hit like a freight train, your breath stolen, the room spinning. Chaeryeong gasps, her hands flying to her mouth, tears spilling swift.

"No, that can't be right," you stammer, your voice breaking. "She was just... she was just here."

Officer Park's voice remains steady, explaining that they need you to come to the station to provide a statement and confirm details. "We're investigating the circumstances," he says. "Can you come down as soon as possible?"

At the station, Officer Park explains the summary process: "Our teams at the scene, collecting evidence, skid marks, vehicle damage. We'll check for mechanical faults, road conditions, or impairment. If there's no criminal evidence, it'll go to an inquest."

You nod, guilt choking you, while Chaeryeong whispers, "She was crying because of us." Officer Park notes it, assigning a contact to keep you updated.

You leave, the weight of Chaeyeon's loss crushing you both. The police will piece together the crash, but no report can erase your mistake. You're left with regret, haunted by the love you destroyed, the cliff's edge a final mark of your failure.

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