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seung-mong · 1 year

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changbin - deadlines

includes: dom! changbin x fem reader, power dynamics if you squint, corruption kink, size kink, use of "sir", praise and degradation, semi-public sex, slight manipulation, overstim, age gap but both are of age:D, changbin is kinda mean and nasty

a/n: prof!changbin is my one true love<3 I DEDICATE THIS CHAPTER TO @prudenceisntjustcute thank u so so so so much u dont understand how happy i am rn

wc: 3104 :0

catching feelings for him was probably the worst possible decision you ever made. here you are in class, practically drooling all over your desk as you watch him. jisung smirks when he notices your zoned-out state, your eyes hazy and unfocused on him. he walks towards you from the front of the class, having just handed in his work.

"y/n?" his voice snaps you back to reality, jisung leaning over and resting his hands on your desk.

"sungie!" you say a little too enthusiastically, and he chuckles.

"they're serving pizza today for lunch. want me to get you a slice?"

only then do you realize that the rest of the class is packing away their things, filing down the lecture hall. screw you and your stupid daydreams.

"oh! yea i'd really like that, sung! i'll follow after you, i just have to uh- clarify some things with the professor." you get up from your seat, shoving your unused notebook and textbook into your bag.

jisung smiles at you, nodding in understanding and leaving you to walk out of the room, leaving you and your professor completely alone. if only jisung knew it wasn't him you were staring at.

seo changbin stands behind his desk, one hand on his hip, the other flipping through the pile of test papers. if he's aware of your presence in his classroom, he doesnt show it. his eyebrows are furrowed and a small frown tugs on the corner of his mouth as he flips over a specific paper, shaking his head at the answers. his glasses threaten to fall down, and he has to push them back every few minutes.

"professor?" you squeak, taking a tentative step closer to him.

he looks up in your direction, an eyebrow raised. your cheeks warm when he smiles at you, beckoning you forward. "miss y/l/n. i dismissed the class a few minutes ago. was there something you needed?" he asks, his voice floating across the room and filling you with a warm feeling.

'yes, your children please.'

"well, i just had a few questions regarding the last homework you assigned?" you cross over to his desk, gripping onto the strap of your bag so tightly you feel the burn in your palm.

changbin chuckles, motioning for you to sit by his desk. "ah yes, the last homework i assigned…. which was due almost a week ago, correct?" he tilts his head down to look at you over his glasses, a mocking smile on his lips that makes you want to kiss him.

you blush profusely before nodding, taking the seat nearest to where you stood. changbin chuckles before crossing to the front so he was directly across from you. sighing, he sat on the edge of his desk, slightly leaning forward towards you.

"well, i wouldn't mind helping out one of my favorite students." he teases, winking at you.

you almost pass out, but your body reacts before your brain and you start to fish for the assignment in your bag. as you do so, you feel his gaze burning your skin, hot and heavy as he tilts his head to the side, as if assessing something about you. you take the paper out with shaky hands before setting it onto his desk.

changbin straightens up and clears his throat. "to be honest, im surprised you're struggling with the work, y/n. your test papers say otherwise." he walks over behind you, hovering over your shoulder.

the tip of his necktie reaches your shoulder, and all you can think about is him stuffing it into your mouth and gagging you with it.

"well all your answers so far are correct, what are the questions you had in mind?" he places a hand on your shoulder and you feel your stomach twist with anticipation and need.

'you're so hot it should be illegal.'

"thats not a question." changbin chuckles, leaving your side and walking towards his desk.

fuck. did you just say that out loud?

he peers at you from behind his desk, a smug look plastered onto his sharp features. you squirm in the leather seat, your skirt suddenly feeling too hot, irritated by the way it sticks to your thighs. you cant seem to look away from his gaze, and he challenges you, raising an eyebrow. youre the first to break, eyes flying to the homework in front of you.

"i guess i'll just f-finish this and like, pass it to you." you clear your throat, shaking your head and hoping your face hasnt gone red.

changbin hums, taking his glasses off and setting them on his desk, right on top of your paper.

"you could. but still, you failed to meet the deadline. i'd have to deduct points from your work for that." he sighs, shaking his head.

you hate feeling like you disappointed him, your head hanging low as you hear him walk over to you, placing a hand behind your chair.

"y/n." his voice is low, urging you to look up at him. you do, your eyes meeting his and it sends a spark of electricity up across your skin.

"sir?" you squeak, the pen in your hand growing slimy from the sweat on your palms. why was he looking at you like he wanted to eat you alive? not that'd you be complaining.

changbin inhales sharply, the title slipping right out of your mouth and straight down to his hard cock. fuck, why were you so pliant? so needy? just begging to be ruined. he sighs, crossing the classroom towards the door and for a moment you think he's about to ask you to leave- when suddenly he locks it behind him.

this is not happening.

"don't you think you should… make up for all the days you failed to submit your work?" he leans against his desk, and you try extra hard not to check him out because holy fuck you can see the tent in his pants and you're squirming in your seat, thighs clenching tightly against each other.

"i dont-"

"you know what really pisses me off, miss y/l/n?" he sighs, his hands gripping the edge of the table right under his thighs. "you keep chewing on that damn pen, and it's just so distracting." he shakes his head, gesturing towards the pen in your hand.

"but- why?" you squeak, stuffing it discreetly into the pocket of your bag.

changbin scoffs in disbelief. "why? baby you drool all over it and got your pretty lips wrapped around the tip i can't help picturing it's my cock instead."

a wave of heat washes over you, and you can't help the moan that escapes your lips. changbin smirks, gesturing you to walk over to him with a wave of his hand. you hesitate, unsure if you physically can stand up and walk over to him without your legs turning to mush.

"aint got that much time, doll."

and you cross the room in three strides. god you were so eager for him, he fucking knew you wanted him as much as he wanted you.

"so obedient." he hums appreciatively, hands hesitating before resting on your sides. you tense at the contact, and changbin coos, lifting a thumb to swipe under your chin. your eyes meet his, and he scoffs.

"do you know how pathetic you look right now? eyes so wide and needy." he tucks your hair behind your ear, bottom lip jutting out into a mocking pout.

you nod, tensing when changbin's hands find purchase on your waist, squeezing slightly. suddenly you're wearing too many pieces of clothing, despite the fact that all you had on was a simple tee. you wanted it off, wanted to feel his hands on your body.

"but i'll take care of you." changbin smirks when he sees your eyes slowly close, already submitting to him.

you wait patiently for him to do something, anything. you feel his hand pull you closer to him by your nape, his lips instantly finding yours. your heart is in your throat when the teacher growls against your mouth, tilting his head to the side and brushing your lower lip with his tongue. you instantly give in to him, not wanting to put up a fight when you know just how badly you wanted this to happen.

you stable yourself by placing your hands on his shoulders, screaming internally when you feel the muscles straining against his white dress shirt. you want nothing more than to rip it off of him. he situates you on his thigh, letting you not-so-subtly grind against his muscle. your whines spill into his mouth and he drinks every single sound you make. it heads straight to his cock and he can't wait to feel you around him.

changbin growls when you pull on his hair, hands harshly gripping you by the under of your thighs and lifting you, just to place you on his desk.

"what would your cute little classmates think," changbin coos, fingers wandering dangerously close to your clothed heat. pinching and squeezing the soft fat of of your thighs. "if they knew what a little slut you are f'me? u know im much older, dont you?"

you whimper at his degrading tone, hands resting on the desk behind you.

"you could have any guy in this class if you wanted. you know that right, baby?" he teases you, fingers gently lifting up your skirt and exposing your underwear.

"d-dont want them. only you." your voice comes out small and pathetic, and changbin fucking loved how small he was making you feel.

"yea?" he grabs your hand from behind you, guiding it onto his crotch and making you squeeze. his cock is hard against your touch, and you gasp at the size of his bulge. "guess they won't be able to fill you up good like i will, huh?"

you nod frantically, desperate for him to just hurry up and touch you. changbin notices this, chuckling lightly and pulling your underwear down painfully slow. he takes a good look at your arousal dripping down your slit and takes a deep breath, sucking in his teeth.

"you're so wet, doll. bet i could slide right in without prepping ya."

you nod eagerly, locking your legs around his hips and pulling him closer to you. he groans at the action, hands gripping onto your thighs so tightly you're sure it'll bruise. you watch with wide eyes when changbin does quick work of undoing his belt, letting it hang in the loops. he unbuttons his pants and lets it fall, just enough for him to pull his cock out.

it won't fit.

he smirks when he sees the hint of worry in your eyes, stare fixed on his cock. changbin tuts at you, one hand wrapping around his base and the other on your chin.

"you'll be a good girl and take it for me, right?" he asks sweetly, dipping the head of his cock and running it along your slit, catching all your slick and rubbing it against him to provide some sort of lubrication. you shiver when it catches on your clit, granting you some sort of friction. you roll your hips eagerly against his, the movement causing your skirt to bunch around your waist.

"i- i dont know. i-i've never…. not this big-"

and knowing that he's ruined you of every other cock almost makes him cum on the spot. instead, he scoffs at your pathetic pout, tightly gripping your waist and pulling you closer to the edge of his desk.

one hand rests on his abdomen while the other supports you from behind, trying to slow him from entering you too quickly. it makes his skin burn, knowing that he's quite literally splitting you open.

"well, i'll go slow." he coos, tip of his cock already prodding at your entrance. you take in a sharp breath when you feel him breach you, just the head of his cock in and you're already faintly dizzy.

"awh, come on baby. you can do it, right?" he takes your hand away from him, not allowing you to stop him from pushing in.

"y-yes sir." you whimper, and those words are enough for changbin to snap, eyes closing from pleasure and abandoning all sense of logic, hoping you won't be too mad at him. with a growl, he loops your thighs over his arms, his hands finding your hips and pulling you flush against him so his cock is fully sheathed in you.

you squeal from the burning sting, tears brimming in your eyes when you feel the tip of his cock in your stomach.

"fucking tight, i'm sorry baby. i'll make it up to you, hmm?" changbin mumbles, setting a brutal pace and ignoring your broken moans and whimpers. every thrust knocks the wind out of you, the sound of the desk rattling under your ass the only sound in the room besides your professor's pants into your neck.

"s'big." you whine, clutching desperately onto his shoulders as he pistons in and out of you. you feel the tip of his cock just subtly brush against the spot you need him the most, and you realize he's doing it on purpose, only thrusting in about half of his cock.

"is it?" changbin scoffs, biting down on your neck and making you mewl. he knows it's sick, knows it's one of the oldest rules in the book- never fuck the students. but it's also one of the most neglected rules.

"m-more, please sir." you beg, hands flying to his ass and trying to push him in deeper yourself.

he groans when you do, pulling away to see you so fucked out, eyes hazy and drool spilling out of your open mouth. he bends down to lick at it, before kissing you roughly.

"more? baby if i gave you any more you'll be ruined." changbin pants against your mouth, but doesn't miss the way you clench even tighter around him.

"does my baby want that? to be so ruined no other cock could ever. please. you." he emphasizes each word with a thrust, and you try your hardest not to scream out loud, knowing that if someone were to look into the small window by the door, you'd be in trouble.

despite the burning stretch in your lower area, you nod. you want him to ruin you. you want him to be the only one who could fuck you this good.

"awh my cute little slut, just want to feel all of sir's cock right?" his thrusts are harsher now, pulling you and fucking you onto his cock.

"y-yes, please sir!" you plead, and it's enough for changbin to give in with a groan, lifting your leg up to his shoulder to get a better angle. you gasp when his cock kisses your g-spot, clawing at his back for him to keep going.

"oh, there? like this?" changbin teases, a smug grin on his face as he drives his cock into you with purpose.

"p-please i cant-" you're stuttering, too drunk on the pleasure of his cock in you.

"you can, and you will." changbin growls, hand sneaking down in between you and fingers rubbing rough circles onto your clit.

you cum almost instantly, the pads of his rough fingers pressing down onto you. you cover your mouth with the back of your hand, but this displeases him. he moves your hand away, instead kissing you to capture the sounds of your muffled cries. changbin's chest fills with pride at the sight of your legs shaking around him, and it's almost enough to send him over the edge.

he doesn't stop his pace, still driving into you as you come down from your high. but this time, his thrusts are deeper, rougher, only thought in mind is getting himself off.

"sir, please. s'too much." you whine, placing your hand on his lower abdomen in a feeble attempt to stop him.

he ignores your plea, wrapping his hand around your wrist and driving even deeper into you.

"shut the fuck up, and take it." changbin growls, too obsessed with the way your pussy wraps around him. you whimper, closing your eyes and trying to focus on the pleasure that he brings you.

"i'm gonna fill you up, and then you're gonna thank me. got it?" changbin groans against your chest, his forehead dipping down onto the soft fabric of your top. you nod, eager for him to spill into you.

"good fucking girl." his voice comes out heavy and almost cracking as you feel his cum spill into you, wincing slightly at the warmth that settles into your lower abdomen.

"fuck, you're such a good girl." he breathes against your forehead, catching your lips in another affectionate kiss as he pulls out. as you lay there catching your breathe, you feel his thick fingers enter you again, pushing his cum further into you. you whine, and changbin chuckles.

"sorry, cant help it. you look too fucking hot with my cum spilling out of you like that."

you blush at his words, throwing an arm over your face. changbin laughs at you, taking your hand away and giving you one last kiss.

"go put your underwear on and keep my cum in you, alright?" changbin's tone is soft despite the lewdness of his words. you nod, hopping off his desk and shuffling his underwear on. you look at him expectantly as he fixes his pants, straightening up his tie.

"awh, baby what is it?" he catches the way he looks at you, and he grins, knowing he has you in the palm of his hand.

"will- uhm. will this happen again or is this more of a one time thing?" you mumble meekly, picking your bag up from the ground and slinging it over your shoulder.

changbin smirks at you, shrugging his shoulders playfully. "depends, let's see how many assignments you fail to submit." he wraps an arm around your waist and takes the late homework in your hand.

"oh by the way," changbin delivers a playful slap to your ass before you turn to leave his classroom. "tell you're little friend that it's rude to snoop." he winks at you, and you tilt your head in confusion.

that is until you turn around and come face to face with jisung, peeking in from the window. his mouth open in shock, and you're frozen in fear. but what you can't see, from behind the wall is the painful hard-on he sports in his suddenly tight jeans.

#skz smut #changbin x reader #changbin smut #mean!prof changbin is literally my dream #im so dizzy #sungie is a perv:(#seung-mong!

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