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woolysium · 27 days ago

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Anatomy Lesson

﹒♡﹒Pairing: Yunho + Mingi (college AU) x reader

﹒♡﹒Summary: As med students, you, Yunho, and Mingi have spent countless hours studying anatomy together—but in this study session, anatomical diagrams turn into hands-on lessons.

﹒♡﹒Word count: 4k

﹒♡﹒Genre: smut (MDNI)

﹒♡﹒Warning: pure filth, very nsfw, threesome, restraint, hand kink, choking, unprotected sex (a no no irl), double penetration, rough sex, very dom!Yunho, whiny mess!Mingi, Mingi is very desperate, teasing, overstimulation (let me know if i miss anything ig its too long)

﹒♡﹒Request: @mingi-s-dimples "Hey pooks 🙂‍↕️💖 it's me, Bia! I'd love to read something written by your for me sooo here is my request 😋😋 Yungi x reader, college au studying anatomy (I have the biggest yungi brainrot rn I'm so sorry + I'm studying anatomy as we speak). They've been study buddies since they started uni 2 yrs ago and they always met to study tgt. SO I'd love to read how reader is like into them but is too shy to tell them and the boys are like.. also kinda into her but they thought it's be weird to like.. tell her cause it'd be a 3some. NOT ANYMORE !! They study anatomy and reader starts touching them intimately explaining some of the structures (for ex thigh/abs and so on) and Mingi for ex gets turned on from it and gets a boner duh. They have some small talk and then they yk.. have a 3some 🙂‍↕️🙂‍↕️🙂‍↕️ sigh. Anyways, I'd love to see: restraining with their bodies/hand kink/slight choking/double penetration (is not a kink ik), praise, teasing 😌 Gave you all the details I'd love to see and THANK YOU SO MUCHHHH LOVE YOUU 😋💖💖💖"

﹒♡﹒Author's note: This took longer than I expected, and filthier.... I never knew i could do this good until now lmao. Anyways this is a long ass fic, and cheers to my babe Bia for requesting it, even though i kinda died at the end so it looks rushed but, hope you like it, I love your idea so so much. It was a ride writing this, I had to research a shit ton on anatomy, but it was fun tho. This is not proofread thoroughly since it's too long and i was getting sleepy, so please ignore any errors. Enjoy the meal. I love you Bia 💜

You’ve known Yunho and Mingi since the first day of med school. Being more of an introvert, you usually keep to yourself, avoiding any unnecessary attention. But that day, the only open seat was right in the middle of the lecture hall. Yunho and Mingi showed up late, looking a bit lost, and ended up grabbing the two seats on either side of you.

At first, you figured they were just two extroverted guys who’d probably drift off to make other friends once they settled in—exactly the type you usually avoid. But as the lecture went on, they kept leaning over to ask for help, clearly struggling with the material. Yunho, with his easy smile and laid-back vibe, nudged you and whispered, “Think you could explain this? We’re kinda lost.” Mingi, with a shy grin that made him seem more approachable than his confident appearance suggested, nodded along.

You explained the basics, and they were grateful enough to ask if you’d study together outside of class. Despite your initial hesitation, you said yes, you couldn’t even believe yourself. From there, study sessions became a regular thing—quiet corners of the library or your living room, where you’d help them with the tough stuff, and they’d bring snacks and keep the mood light. They made everything feel a bit more bearable at least, even the late-night cram sessions.

Two years later, the three of you are still a team, but things have changed. Somewhere along the way, simple glances and casual touches started to linger. And there were moments—small, fleeting ones—where you could swear they were feeling it too. Like when Yunho would shift closer to you on the couch, his arm draped casually behind your shoulders, his fingers brushing the back of your neck just enough to make your skin tingle. Or when Mingi’s hand would find your lower back during those late-night coffee runs, the touch lingering a little too long to be just friendly. But no one ever said anything about it, all of you dancing around the unspoken tension that had begun to define your time together.

Tonight is just another study session at your place, and you don’t really think much about anything else other than the lessons. You're all spread out across your bed—Yunho sitting up against the headboard, his long legs stretched out, Mingi lying on his side next to him, propped up on one elbow. You sit cross-legged facing them, surrounded by notes and anatomy diagrams.

You're pointing out different muscle groups and explaining their connections, but you notice the looks of confusion on their faces. With a little laugh, you suggest, “Guys, I think it would be better to show you directly. How about I demonstrate them on your body?” Totally innocent request, or so you thought.

Yunho glances at Mingi, who shrugs with a faint smirk. “Yeah sure. Might be easier to understand that way,” Yunho says, scooching to the side a bit to make space for you. Mingi stretches out beside him, nodding along.

You start with Yunho, tracing the lines of his arm, outlining the biceps and triceps as you explain each muscle group. “So, here’s the biceps brachii,” you murmur, fingers gently pressing along the length of his upper arm, feeling the firmness beneath. Yunho listens intently, his usual playful smile tempered by a newfound focus as he watches your hand. “And just behind here, the triceps—helps with arm extension,” you continue, trailing your hand down the back of his arm. His body is relaxed under your touch, but there’s a slight shift in his breathing when your fingers glide over his chest and down to his abs, the smooth firmness beneath your fingertips making you a little more aware of the warmth radiating between you.

When you move over to Mingi, the atmosphere tenses up even more, you are oblivious, somehow. You run your fingers along his chest, explaining the pectorals. “This is the pectoralis major—it’s responsible for moving the arm across the body,” you say softly, your hand tracing the broad curve of his chest. He listens closely, his breathing grows a bit deeper as you outline each muscle. You continue downward, fingertips gliding over his defined abs. “And here’s the rectus abdominis… your core muscles.” Mingi’s body tenses beneath your touch, brows furrowing as he bites his lips, trying to control his reaction.

“This part—your obliques, they help with twisting movements,” you add, tracing the defined muscles, feeling the warmth of his skin through the thin fabric of his shirt. Your touch follows the natural curve of his hip, then skims lower. It’s meant to be purely academic, but then your fingers slide over the curve of his hip and graze against the waistband of his jeans.

You’re about to pull away when your hand slips, just slightly, brushing over his crotch. You freeze, the realization hitting you like a jolt, the feeling of Mingi’s arousal under your fingertips sending a rush of warmth to your own cheeks. Mingi’s breath catches audibly, his body tensing beneath your touch. You glance up at him, heart racing, but his expression is caught somewhere between surprise and something more intense, his face flushed.

Before you can say anything, you catch the way Yunho's expression has changed too. There’s a heat in his eyes as he looks between you and Mingi, cheeks a little flushed and his breath coming out uneven, though he’s still trying to keep up his usual playful front. "You know, you might be a little too good at this," he says, his voice dropping, teasing but rougher than usual.

The air in the room feels thicker, making your heart beat faster. Yunho moves in closer, his gaze darker, watching you in a way that makes you swallow hard. There’s this electric charge between the three of you now, impossible to ignore. For a second, it’s like time stops—none of you quite sure how to navigate this shift, but aware that something's definitely changed.

Yunho’s usual teasing grin fades when he catches your gaze, something more serious in his eyes. His breath hitches, and you notice how he glances from your eyes to your lips, then back again, like he’s debating what to do. The room goes quiet, and the tension is thick enough to make you feel like you’re holding your breath.

You swallow hard, nerves making your voice waver as you finally break the silence. “I... I’ve liked both of you for a while now,” you admit, your cheeks heating with embarrassment. “But I was too scared to say anything. I thought... I thought you’d find it weird, or that it would ruin everything.”

Mingi lets out a breath he’s been holding, his expression softening even as his lips curl into a smirk, a mixture of relief and disbelief paints his face. “You serious?” He glances over at Yunho, who gives a slow, almost doubtful nod, as if he can’t quite believe what he’s hearing either. Mingi’s hand moves to rest on your thigh, his grip firm, sending a jolt through you. “Look, Y/N. We’ve been into you for so long, but we thought you’d be freaked out by the idea... of being with both of us like this, you know.”

Yunho’s hand tilts your chin so you’re looking right at him. His thumb brushes over your bottom lip, and his voice drops lower. “Yeah, we didn’t want to make you uncomfortable. But if you’re saying you’re into this too...” His other hand slides to your waist, tugging you a bit closer. “Maybe we’ve been holding back for no reason.”

You shiver under their touch, heat pooling low in your stomach as the reality of the situation sinks in. Mingi’s thumb strokes slow circles on your thigh, his other hand trailing up your back. Yunho leans in closer, his lips brushing the shell of your ear as he murmurs, “So... what do you want, really?”

You catch your breath, feeling their warmth pressed against you from both sides. You look at them, and it’s like all the unspoken feelings are right there on their faces. A nervous smile tugs at your lips as you admit, “I want... both of you.”

Mingi’s grip tightens, and Yunho’s breath comes out in a low, almost relieved sigh, his fingers slipping beneath the hem of your shirt. It’s like a dam breaking—no more restraint, just the three of you finally letting go of the tension that’s been building for so long.

The bed dips under their weight as Yunho settles behind you, Mingi in front. The heat radiating from their bodies is intoxicating, and you shiver as Yunho’s rough hand grips your jaw, tilting your head back. “Look at you. Already so needy,” he growls, the pad of his thumb grazing your lower lip, sending a thrill straight to your core.

His lips crash into yours, rough and eager, as if he can’t hold back a second longer. His hands are everywhere—one cupping your face, his thumb brushing over your cheek, the other slipping beneath your shirt, his touch leaving a trail of heat in its wake. His grip is firm, possessive, his fingers digging into your skin as he pulls you closer.

Mingi’s hands tug at the hem of your shirt, impatience lacing his movements. He pulls the fabric up and over your head, his fingers fumbling slightly as he tosses it aside. “He’s always in such a hurry,” Yunho teases, his voice a low rumble against your lips, but there’s a smirk in his tone that says he’s just as eager.

Your bra is the next to go, Mingi’s hands quickly unhook it and slide it down your arms. His eyes darken as he takes in the sight of you, his tongue wetting his lips. “You look so good like this,” he murmurs, his breath coming in shallow pants. He palms your chest, thumbs brushing over your nipples, drawing a gasp from you as he rolls them between his fingers, his touch alternating between gentle and rough.

Yunho’s hand trails down your side, fingers hooking into the waistband of your pants. He yanks them down in one swift motion, along with your panties, leaving you completely bare between them. He pulls back just enough to admire the sight, his lips curving into a satisfied smirk. “You’re beautiful, I’ve dreamed of this for so long,” he says, but there’s a rough edge to his voice that sends a shiver through you.

His breath is warm against your ear, his hands trailing down your sides, tracing the curves of your body with a possessive touch. He pulls you closer against him, his large hands sliding over your thighs before gently urging them apart. He holds you open, one arm wrapped around your waist to keep you steady while the other spreads you wider, his fingers brushing against your slickness as he exposes you to Mingi.

Meanwhile, Mingi’s hands roam over your thighs, pushing them apart as he leans in, his breath hot against your skin. His fingers tease along the edge of your crotch, just barely brushing over your wetness.

“Already soaked, huh?” Mingi’s voice is husky, tinged with a whine as his fingers press harder, rubbing slow circles over the soaked heat. He’s watching you, eyes blown wide with lust, lips parted as he takes in every little reaction. He lets out a shaky breath, his impatience bleeding through. “You’re so fucking desperate for it, aren’t you?”

Yunho’s hand wraps around your throat, fingers tighten slightly, cutting off your reply. “Mingi, quit messing around,” he commands, his tone leaving no room for argument. His fingers slowly twisting your nipples, hard enough to make you gasp. “She wants it rough, so let’s not make her wait.”

Mingi, positioned between your legs, drinks in the sight of you with darkened eyes, a low groan escaping him. “Yunho, she’s so wet for us,” he mutters, his voice husky with desire. He presses a kiss to the inside of your thigh, his lips trailing a path closer to where you need him most, his breath teasing your skin and making you squirm in Yunho’s hold.

Yunho tightens his grip, keeping you steady, a smirk playing on his lips as he feels you try to press closer to Mingi. “Easy, baby. Let him take his time with you,” Yunho murmurs, his tone low and commanding, his fingers brushing along your inner thigh as he keeps you spread wide for Mingi.

Mingi glances up at you through half-lidded eyes, his mouth hovering just inches away from your core, and you can feel the heat of his breath ghosting over your most sensitive spot. “You ready for this?” he asks, his usual confidence cracking just enough to reveal the desperation underneath. He doesn’t wait for your answer before leaning in, his tongue dragging slowly over your folds, tasting you with a groan that vibrates against your skin.

You gasp, your head falling back against Yunho’s shoulder as the sensation crashes through you. Mingi’s mouth is relentless, his tongue working you over with a rhythm that has your thighs shaking, but Yunho’s grip keeps you from closing your legs, keeps you open and exposed to every lick, every gentle suck. He spreads you wider with his fingers, giving Mingi the perfect angle, and Mingi takes full advantage, his tongue dipping inside you before dragging back up to circle your clit, teasing you mercilessly.

Yunho’s lips find your neck again, pressing rough kisses along your skin, his teeth grazing over your pulse point. “Look at you, falling apart already,” he whispers, his voice filled with amusement as he watches the way your chest heaves with every breath. “Mingi, I think she likes that,” he teases, his hand sliding down to cup your breast, his thumb brushing over your nipple in slow, deliberate circles.

Mingi pulls back just enough to speak, his voice low and rough. “She tastes so good, Yunho... I don’t think I can stop,” he admits, his usual confidence slipping into a more desperate edge. He dives back in with a hunger, his tongue working faster now, alternating between soft licks and harsher, more focused attention on your clit, sucking it into his mouth and flicking it with his tongue until you’re crying out, your hands clutching at Yunho’s arm for support.

Yunho groans softly at the sound of your moans, his own arousal pressing hard against your lower back. He lets one hand drift down, his fingers grazing over Mingi’s jaw as he works, a silent encouragement as he keeps you pinned in place, making sure you can’t escape the overwhelming pleasure. “Yeah, that’s it, Mingi... make her fall apart,” Yunho breathes, his own voice thick with desire as he watches the scene unfold.

Mingi’s pace grows more frantic, his lips and tongue driving you to the edge, his hands gripping your thighs to keep you steady as he devours you like he’s starving. The combination of Yunho’s firm, steady grip and Mingi’s relentless mouth leaves you helpless between them, your body arching as the tension builds, heat pooling low in your belly until you can’t hold back anymore.

“Yunho, please... I—” Your words dissolve into a choked moan as Mingi’s tongue circles your clit faster, pushing you right to the brink. Yunho’s hand slides back to your throat, not applying pressure but just resting there, a reminder that he’s the one in control, a reminder of how completely you’re at their mercy.

“That’s it, baby. Come for us,” Yunho whispers against your ear, his thumb stroking over your pulse as if feeling the way it races beneath his touch. His other hand tightens on your thigh, holding you wide open for Mingi’s tongue, making sure you can’t escape the intense sensations that roll through you in waves.

And when your release finally crashes over you, it’s like everything shatters—your body shaking between them as Mingi holds you steady, his tongue slowing but never stopping, drawing out every last aftershock until you’re a trembling mess in their hands. Yunho’s grip softens, turning soothing as he brushes his lips against your temple, “Good girl,” his voice soft in a low register.

Mingi pulls away from you, lips slick and pupils blown wide, catching his breath as he watches the way your body trembles. He flashes you a wild grin, his lips curling into a satisfied smirk as he takes in the sight of you coming undone. “You’ve got no idea how good you look like this,” he murmurs, voice rough and low, sending a shiver down your spine.

Yunho’s large hand cups your jaw, his fingers pressing gently but firmly as he tilts your head back, stealing your breath with a demanding kiss. His tongue slides against yours, leaving you dizzy with the heat of his mouth, while his free hand drifts between your legs. His long fingers find the slickness Mingi left behind, sliding inside you with ease, spreading your pussy open, curling to press against that sensitive spot that makes you gasp into his mouth. He groans at how ready you are, his own control slipping as he pumps his fingers slowly, making you arch against him.

“Think she’s ready for us, Yunho?” Mingi teases, pressing hot, open-mouthed kisses along your thighs, his voice tinged with a playful edge even as his own breath comes out shaky. His hands press your legs open wider, his grip rough and eager, holding you in place beneath him.

Yunho pulls back, letting his lips ghost over the shell of your ear as he speaks. “More than ready,” he murmurs, his tone low and dark. He withdraws his fingers, leaving you clenching around nothing, and Mingi’s lips twitch into a smirk as he watches the way your hips move, seeking more. He pulls his own shirt over his head, revealing the toned muscles beneath, and shoves his jeans down in a hurry, his cock heavy in his hand as he strokes himself, his eyes glued to the way you tremble beneath them.

They both shed the last of their clothes, and the sight of them—Mingi with a desperation in his eyes, his cock hard and leaking, and Yunho’s self-assured composure as he strokes himself slowly—has heat pooling in your belly all over again.

Yunho catches Mingi’s eye, and there’s a shared look between them—a look that you can’t quite make out of. Mingi huffs out a breath, a smirk curling his lips even as his hands tighten on your thighs. “Ready to make her feel good, aren’t we?” Yunho taunts, his tone edged with a dangerous kind of promise.

Mingi’s response is a low hum as he settles between your legs again, his breath ghosting over your sensitive skin. He presses a final kiss to your thigh, his lips soft before he lines himself up with your entrance. “You’re gonna take us both, sweetheart. You up for that?”

Yunho’s grip tightens on your jaw, guiding your head back so you’re looking at him, his expression dark and intense. “She can take it. Can’t you?” he challenges, his thumb brushing over your lips, the pressure making your breath hitch. You nod, can’t even form words, and a satisfied smirk tugs at Yunho’s mouth.

Mingi eases himself inside you, inch by inch, his moan vibrating through you as he stretches you open. The way his big dick fills you is almost overwhelming, his rough grip grounding you as he bottoms out, shuddering against you. “Fuck, she’s so tight... I’m not gonna last if you keep squeezing me like that,” he’s breathless, barely keeping himself together as your body tightens around him.

Yunho smirks, his fingers flexing against your throat. “She likes it, Mingi,” he murmurs, the dominance in his tone sending a thrill through you both. He moves his hand to your clit, his touch unrelenting, and the added sensation sends you spiraling, your body arching back into him as he drives you higher.

Yunho’s smirk widens, his gaze tracking every twitch of your expression as he positions himself behind you, the thick head of his cock pressing against your entrance alongside Mingi’s. He moves slowly, letting the stretch settle in, and you gasp at the sensation, the stretch is intense, burning in the most delicious way as your body struggles to adjust. They both push forward, filling you to the brim, and you can’t hold back the sharp cry that escapes you, the sensation leaving you breathless.

Yunho’s breath ghosts over your skin, his voice a low growl in your ear. “Look at how desperate he is for you,” he taunts, his fingers pressing down on your clit, rubbing rough circles. “But you love it, don’t you? Being filled like this, over and over until you can’t even think straight.”

Mingi’s head snaps up at that, his lips curling into a defiant smirk even as his movements falter, every thrust turning sloppy and wild. “She loves it... I can feel how tight she gets every time you touch her,” he gasps out, his voice cracking into a moan as Yunho’s fingers tighten their grip, applying just enough pressure to make you gasp, and he holds you there, his grip firm as he watches the way your lips part, vision going hazy. Mingi loses himself in the rhythm, his cock twitching inside you as he chases the edge of release, his desperation palpable in every shuddering breath.

You can feel Mingi’s pace falters, his head dropping to your shoulder as his breath stutters against your skin. “Fuck, I can’t hold back... she’s driving me crazy,” he groans, his voice breaking on a whimper as he feels the way you clench around him.

From behind you, Yunho chuckles, his own control slipping as his hips snap forward, burying himself deeper inside you. “Don’t hold back,” he growls. “Make her come again.” The dual sensations of their thrusts, the weight of their bodies, and the intimacy of the moment push you closer to the edge, and you feel the tension building again. “I can’t—oh, God, I’m so close!” you cry, your nails digging into Mingi’s arms as you cling to him.

The room fills with the sounds of your combined breaths, the wet slap of skin against skin, and the low, breathless curses spilling from Mingi’s lips. His hand slips, reaching back to grip Yunho’s wrist, grounding himself as he rocks into you with wild abandon, his moans turning needy and high-pitched as he finally loses himself in the pleasure.

Yunho increases his pace, and Mingi’s fingers dig into your skin as he matches the intensity. “That’s it, just let go,” he encourages, his voice a desperate plea.

The heat spirals through you, the sensation of being double filled amplifying everything. Your body arches back against Yunho, and with a final thrust from both sides—it pushes you over, and you come with a broken cry, clenching down around them.

Mingi loses it then, his hips stuttering as he spills inside you with a choked moan, his whole body shuddering against yours. Yunho isn’t far behind, his grip on you steady as he pushes deep one last time, burying himself as he loses control. He keeps moving through the aftershocks, drawing out every last drop of pleasure until you’re a trembling, spent mess in their arms.

They hold you there, their bodies pressed against yours, the heat of the moment fading into a heavy, sated silence. Mingi’s head rests on your shoulder, his breath ragged against your skin, while Yunho’s hand gently loosens around your throat, his lips pressing a softer kiss to the side of your neck.

You’re all left panting, tangled together in a messy heap, the air thick with the scent of sex and satisfaction. Mingi pulls out first, dropping back onto the bed with a breathless laugh. “Fuck, that was... intense.”

Yunho wraps an arm around your waist, pulling you against him as he presses a kiss to your shoulder. “Yeah, it was an intense anatomy lesson, but she took it like a champ,” he murmurs, voice full of pride. “Didn’t you, babe?”

You nod weakly, a small smile tugging at your lips as you relax into their warmth. “Yeah... I did.”

by @woolysium

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