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jean-kayak · 3 years

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A Little Reward

Summary: You agree to help Keishin study with a way that might help the information stick (GOOD GOD I am bad at summaries pls just read it)

Pairing: Ukai Keishin x black!fem!reader

Warnings: smut (18+!!), unprotected sex, minor fingering, dirty talk, degradation, daddy kink, ass smacking, handjob, groping, reader is picked up, a lot of biology references, college!au

Word Count: 2,366

A/N: So, I finally understand what I’m doing in my bio 183 class, and when I tell y’all I am ECSTATIC, so that’s where this came from

Tags: @her-majesty-kiara, @iwascrybaby, @mxhriii

When Keishin came to you asking if you could help him out with biology, you'll admit that it took him more than a couple of times to convince you. He claimed that he was so bad at it and that he didn't know how well he was going to do on the test.

You also knew that he was so bad at hiding how much he wanted to fuck you.

You weren't stupid. You always caught the way he would stare at you, and you liked the attention, purposefully putting a little more swish in your hips, knowing his eyes were drilling into your ass.

He was always catching you before you could walk out of the science building, offering to walk you back to your dorm, and he would spend the whole walk trying to charm the pants off of you. You wondered how many girls fell for it, not saying that you weren't falling for it either, you just thought you could make him work a little harder.

And it's not like you didn't want to fuck him either. He told you he played volleyball in high school, but he's seemed to bulk up a little more over the course of you knowing each other, his clothes like a second skin, so it wasn't hard for you to imagine what was hiding underneath.

He sighs as he running a hand through his hair, effectively pulling his headband with it, so he takes it off, wrapping it around his wrist. "I'm never going to get this," he groans in frustration.

"You haven't even tried," you say lightly, moving to lean against his desk, resting your hands behind you.

"I've been trying for thirty minutes," he sighs again, resting his elbows on his knees.

"Maybe you need a little incentive," you offer with a shrug, and he leans back in his chair, his eyebrows raised.

"Yeah? Like what?" He smirks, and you tilt your head to look up at the ceiling like you're trying to think even though you already know what you have in mind.

"I'll ask you a question," you start. "And for every right answer, I'll take something off." His eyes widen a little, and you give him a sweet grin.

He scoffs. "You're serious?" You hum as you shrug again. "What's the catch?"

"Nothing. But I don't think you'll get very far," you taunt, and you can see the challenging shimmer in his eyes, a look he gets whenever you both try to be competitive with each other.

You give him about another thirty minutes to go over about a quarter of the notes before you get ready to start the questions. "Ready?"

He nods confidently, thinking that this will be a piece of cake when you know that it's going to be the complete opposite. "ATP. What is it?"

You start off easy, and he huffs as he leans back in the seat, resting his hands on his thighs. "Bottom line, it powers cellular processes," and you smile as you nod your head. "Come on, baby, you gotta do better than that."

You give him a bored look, but you chuckle at his obliviousness to your plan. You uncross your arms before slipping your shirt over your head, letting it slide off your fingers and onto the floor.

You see him take a deep breath as his eyes zero in on the white lacy garment adorning your chest, accentuating your brown skin, your nipples just shy of being seen. "How's it made?"

He doesn't hear you, or if he does, he's too focused on your boobs to answer, and you snap your fingers, and he blinks slowly. "From ADP," he answers, clearly distracted. "Substrate level whatever," he adds, and you roll your eyes.

"What's it called?" His gaze hasn't left your chest, and you walk up to him, leaning down to rest your hands on the arms of the chair. You know your boobs are falling over the edge of your bra, and he releases a breath before he brings his eyes up to yours.

You walk around to stand behind him, leaning back down as you slide your arms over his broad shoulders before you hover your head next to his ear. "Answer the question, Kei."

"Phos...phorylzation," he says slowly, and you smile widely. You walk back to stand in front of him, and you see his hands turn into fists when your hands reach under your skirt.

You thumb at the side of your panties before slowly pulling them down your legs, stepping out of them, holding them on the edge of your finger. "Good job," you quip, and he watches you throw them to the side, the article landing on your shirt.

You take a step closer to him, and you lightly push his hands off of his thighs before you replace them, straddling him, and he bites his lip to stop himself from making any sound. You can feel your slick soaking his sweats, not expecting to get so affected by how he was only looking at you.

"What's the role of oxygen?" you ask next, and he closes his eyes for a brief second before he opens them, feeling another wave of arousal rush out when you see how hazy his eyes are.

You brush a few blonde strands out of his face as you wait for an answer, and his hands are twitching from how bad he wants to touch you. "It, uh," he licks his lips, his head slightly falling back on his shoulders. "Carries out metabolism."

His voice is airy, and you hum softly as your hands run down his sides, staying at his waist. "You're starting to get it," you praise, and you grab the hem of his shirt. He looks at you, his brows jerking slightly at your actions. "Wouldn't be a lot of fun if I'm the only one stripping," you explain, and he slowly lifts his arms up, allowing you to pull the clothing over his head.

You bite your lip as you toss it to the side, your eyes landing on his lightly defined abs, and he tenses when you softly run your hands over his abdomen. His clothes did a bad job at telling you what they were hiding.

You internally shake your head, remembering what you're supposed to be doing, and you look up to meet his eyes as your fingers lightly press into his skin. "The four main stages, in order," you tell him next, and he sighs shakily as your nails drag down from his shoulders, making him shudder.

He gets halfway through the answer, and you roll your hips just a little, and his hands shoot up to your hips before stopping himself as his head falls back. Your arms wrap around his neck, your hands lightly pulling his head back up by his hair. "Finish it."

You can barely hear him, but he gives you the rest of the answer, and you grab his wrist and guide him to the clasp of your bra. He quick to undo it, and you slowly slide the straps off your shoulders, your tits falling onto your chest as you slip it off, throwing it on top of the rest of your clothes.

"Shit," he mumbles, his eyes focused on your nipples that are starting to harden from the exposure of the cold air.

You chuckle softly, starting to feel your body becoming warm under his heated gaze. You guide his head up by his chin to look at you. "Pyruvate. What happens to it?"

His eyes dip down to your lips as you speak before returning back to your eyes. "It's oxidized."

"Yes. And?" you press, and he's starting to have a hard time controlling himself. "You've been doing so good," you praise, grazing his sides with your nails, and he bites his lip again.

He can barely get the answer out, and you shift again, his breath hitching at the stimulation, and yours hitching when you feel how hard he is under you. You can practically see his arms shaking with the urge to touch you, so instead of stripping you allow him to touch.

You can barely get the words out before his hands are moving to your chest, cupping your tits in his large palm, and you moan softly. His fingers play with your nipples, and your hands grip his shoulders. He moves his hands to your thighs, barely covered by your skirt, and he runs his calloused hands over your skin before they make their way under.

His hands run over your ass before gripping the flesh in his hands and spreading you open before pushing you down onto him. You let out a louder moan in surprise, and he does it again, groaning just as loud as he bucks up into you.

You feel the air slip from your lungs for a split second before you stop him. "Slow down, tiger. We're not done yet," you chide even though you want to fuck him just as bad as he wants to fuck you, but you want to tease him just a little bit longer even though you're teasing yourself in the process.

He lets out a small whine in protest, not having enough friction, but he lets you keep going anyway. "Let's make this more interesting, yeah?" He barely lets you get off of him, but his hands grudgingly let you go, and you stand before getting rid of your skirt.

He shamelessly lets out another groan at the sight of your shiny folds, and when you pull at the waistband of his sweatpants, he's quickly lifting his hips so that you can pull them down. You go to scoff when you see that he's gone commando, but your mouth falls open when his dick springs up, hitting his taut abs, the tip a deep shade of red.

He watches you bring two fingers to your dripping hole, swirling them around at your entrance before sliding them in, and you both moan simultaneously. You thrust your fingers inside of you a few times before slipping them out, your fingers coated in your juices.

You rest your other hand on his thigh, moving the other one towards his straining erection, using your slick as lube as you stroke him. Your hand leaves him, and he feels like it's gone too soon, but then he sees that you're putting your legs on either side of him as you line yourself up.

He grips your hips tightly when he's fully inside you, sighing easily at the feeling of your warm walls around him. "Next question," you speak up suddenly, and he's looking at you like you have two heads, and you chuckle softly. "We have to make sure you grasp the concept."

You're asking him questions, and he can barely answer, the only thing he can focus on is how your walls are grasping him. He knows you're doing this on purpose, asking him the same questions but in a different way, rolling your hips every time he takes too long to answer.

And that's his breaking point.

You're about to ask another annoying question, and you cut yourself with a yelp when he picks you up, moving you to his desk. He brushes everything off in one sweep, setting you down, and pounding into you as soon as he sets you down.

You cry out, your arms wrapping around his neck. "Answer this question, sweetheart," he groans in your ear, grabbing your ass to further spear you with his dick. "You like it when I fuck you like this?"

The only thing you can do is make incoherent noises, the last thing on your mind is responding, and he smacks your ass, hard. "Answer the question."

"Yes, Kei! Fuck," you gasp, your eyes closing and your body going limp when he hits that sensitive spot inside of you.

"You like teasing me, huh? Wanted me to fuck you like a bitch in heat?" Granted, you didn't really expect this outcome, but you're nowhere near complaining.

The only way you can answer is by breathless, incoherent noises in his ear, and he's moving you, pushing you down flat on your back on his desk. He pushes your legs to your chest before resuming his punishing pace.

"You wanted to be fucked by Daddy's cock like a little slut, yeah?" he spits, leaning down to breathe against your mouth, and you don't know if he can see your nod, the only thing you can do to answer him. "Daddy's fucking you good, isn't he?" he asks, a shit-eating grin on his face knowing that he's rendering you speechless.

He reaches down to press down hard on your clit, making you jump as you dig your nails in his arm. "You gotta answer, or I'll stop," he threatens, thrusting his hips with a little more force to really nail your g-spot.

"Y-Yes, Daddy, s-so good," you moan, and he swears when you clamp around him, your climax nearing its peak.

He rests his elbows on the desk to give him more leverage, and that pushes your legs further into your chest, the air seeming to slip out of your chest. "Shit," he moans, savoring the feeling of you sucking him back in every time he pulls out.

"God, Kei, 'm close," you barely manage to say, and he closes the minimal distance between your lips, and you can barely kiss him back. He pulls your lip between his teeth when he pulls away.

"Then cum, sweetheart, cum," he breathes, and his body is tensing up as he spills inside you, but he keeps moving until you cum right after him, riding out both of your highs before slowing to a stop.

He moves his arms so that your legs fall, and you take in a huge gulp of air before your breathing quickly again. He puts his arms back beside your head before kissing you deeply, your hands brushing the hair plastered to his forehead.

"You know, I think I need some help with calc if you wouldn't mind?" he says, and you chuckle breathlessly.

"I wouldn't mind at all."

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