Engineering Statistics

“When do you use the Poisson distribution?”

“It’s–” and Youngeun pauses, tapping the Apple Pencil on her cheek, eyes pointing elsewhere “–number of events occurring in a timeframe?”

“Correct!”

The library is quiet, making reservations for the encouraged silence. The squeaky clean scent of the air wafts into your nose. The tables and chairs are neatly arranged, at least before the crowd enters and scatters them all over the place.

You decided to apply for the faculty’s tutor position for some quick cash, good money per hour, after all. You can spend it on some nice meals after a few sessions.

Your first student is Seo Youngeun, a sophomore, just a year below you, and you can tell that she has done a decent amount of preparation for this, being receptive and eager so far. She asks questions and tries to solve problems the best she can. It’s making your first time easy, really.

“What about binomial distribution?”

“Hmm, a chance for a certain number of successes?”

“You’re making this really easy for me.”

Youngeun laughs, covering her mouth with her hand, body falling backward slightly. “I’m just trying to be a good student, if that helps.”

“You certainly are.”

The session goes on, and Youngeun continues to be resolute. She asks questions, summarizes the answers in her own words, constantly trying to understand the subject she’s learning. This is really easy for you, and you only wish that the next sessions will be like this.

“Can I take a look at your old assignments?” Youngeun asks, shifting slightly in her seat. “I wanna see how you did them.”

“Sure! I’ll just AirDrop–” Your words are cut off as Youngeun leans in closer towards you, scrolling your iPad for the assignments. Her flowery perfume hits your nose, making you shiver a little.

“Uh.”

Her hand presses into your thighs for a hold, feeling a bit heavy against your skin. You tremble slightly as she applies the pressure on you, feeling a brand new kind of current running through your body. Your eyes are focusing on her face—so gorgeous. Smooth jawline. Curious eyes. Soft-looking lips. She’s definitely a catch.

Inevitably, your vision shifts down towards her workshop shirt. She only wears a tight, white crop top underneath. It looks good on her, casually stylish. How nice would it be to go on a date with her in these clothes?

Soon, your eyes wander towards the smooth, milky skin of her cleavage. Oh, how nice would it be to sink your face into that dip of her curves? Your mouth feasts on her hard nipples—so salty, so full of her perfume—eliciting sharp moans from her lips. She presses your head into her chest, creating such a salacious, filthy bond between your mouth and her tits. Your hands sink into the plumpness of her ass, feeling those muscles flexing against–

The automatic door opens, introducing a new patron to the chilly library. You blink, regaining that precious awareness back, and you know that you’ve been staring a tad too long. Lucky that her eyes are still on your iPad.

You quickly look away, hoping to find some reprieve in other objects—chairs, tables, books. Your legs press into each other, adjusting the growing erection in your pants. Heat creeps up your body. Your stomach sinks—this is fucking embarrassing. You’re supposed to teach your student, not imagine yourself sucking on her tits!

Her hand lingers, staying there. She doesn’t squeeze; she doesn’t press harder, but it’s sure having an effect on you. Your breath quickens. Your hands tremble. Your cock hardens. Fuck, you can’t let her see you getting all worked up like this!

She even adjusts her top, revealing even more of her cleavage. There’s no way out of this. Your pants are barely holding it together.

After what felt like an eternity, Youngeun’s hand finally leaves your thighs, giving you the space you’ve been craving. You let out an exhale as she lets you go. Youngeun goes back to writing something on her iPad, completing her assignments as you desperately cling on to your composure.

“Divided by k factorial–can I take a break for a bit? We’ve been studying for half an hour already.”

You clear your throat, trying to maintain a professional façade. Hope she doesn’t see it slipping.

“Uh–sure.”

—

You let out a sigh as you relieve yourself alone in the bathroom, eyes closed, head falling back. Your body feels so light; the tension slowly dissipates away. Just half an hour more and this will all end. No need to worry about her intimacy like that again. Just be a professional, keep your cool.

Until you feel a pair of arms wrapping around you.

“Hey there, pretty boy.”

Youngeun.

Your eyes widen in shock. Your body jolts in her warm embrace that disarms you completely. Her hands trail down your taut abdomen, down to your cock that’s in the middle of the business. She holds it gently with her fingers, making your cock grow harder in an instant.

You glance back at her. “What–What are you doing, Youngeun?”

“Shhh, be quiet in the library, baby. It’s against the rules,” she coos—voice so airy, so seductive. It’s a wonder how she manages to be so calm and authoritative in this situation. Your body easily wobbles under her touch, control being stripped away so quickly. The hold on your length is flipped over to hers in an instant.

You’re still in the middle of emptying your bladder, but the grip on your cock is fully hers. She grips it firmly, but never too tight. Youngeun is holding a goddamn royal flush here, and she makes sure that you can’t fold.

The stream weakens—from continuous flow to smaller drops. Youngeun wiggles your cock lightly, getting rid of the final remnants on your slit, and you can only watch helplessly as they fall into the urinal.

“Flush it,” she orders—so calm, so hushed.

Nervously, your hand moves towards the lever, barely able to push it down. The urinal makes noise as the water falls from the top, cleaning your filth into the pipes.

Youngeun tightens her hold around your hard cock—warm—sending a jolt of electricity through your body. Her other hand trails down your body, caressing the skin along the way, until she reaches your testicles. Youngeun cups it gently, delivering warmth to your frame. Your breath comes out shaken from the overstimulation, almost a moan. This is just too much, too intense. You have to grab the compartment divider to keep yourself standing.

Her warm hand begins to stroke your length, and that almost makes you collapse in her hug. She slides your foreskin back and forth, slowly, tortuously, stimulating you with such divine sensations. Your body squirms, overloaded by the act. Your back arches against her embrace. You struggle to stand upright. Breathless moans leak out of your lips into the cold air of the bathroom. You’re getting loud, but you just can’t help it when you have your student jerking you off like this!

“What did I say about making sounds, baby? Hmm? High chance of people hearing us,” Youngeun whispers, quickening her pace on you, tightening her grip. You feel even more helpless with her restraining you like this. And the worst part is: she’s smiling all so casually, like this is a normal occurrence for her.

Your cock swells against the palm of her hand, aching for that sweet, sticky release. Precum leaks out of your slit. You’re desperately trying to hold your body still within her warmth, trying not to collapse, to falter. The chill from the air conditioner hits you, contrasting the warmth from her small frame. Your muscles tighten against her—chest heaving, thighs clenching, so ready to cum. The wet, obscene sounds of the strokes fill the bathroom, lucky that no one is here yet in the morning.

“I’m gonna make sure you cum so hard that these little balls become dry.”

Your body shudders with her words, shaken by the sheer anticipation and pleasure she creates with her tiny hands. You can feel that you’re close—how your body strains against her abdomen, how your hips begin to thrust into her hands, how your breathing comes out short. You’re just Seo Youngeun’s plaything, and she makes sure that you are more than aware of it.

“Come on, cum for me. I wanna know how you taste.”

Your breath hitches. Your entire body spasms—a shock delivered from her filthy little hands. The first spurt of your cum is shot onto the urinal, painting it with the first stroke of ivory. Your moans leak out, barely suppressed. The second spurt brushes against the porcelain with another stroke. Then the third. Then the fourth. Then the fifth. You strain with each burst of your cum, barely able to breathe properly.

“You’re cumming so much, wonder who did this to you,” Youngeun coos, rubbing your cock to coax any cum left in your balls. Your nectar continues to dribble out of your slit. Your body shakes in her hug.

Bursts become drizzles. The orgasm slowly subsides, but Youngeun is making sure that you’re all drained by the time she’s done with you. Her pace slows down, but the grip is still tight—to empty you, to make you devoid of any essence. The drops begin to stain her hands, leaving white on her skin.

Youngeun teases, still forcing the last drops out, “Oh no, how am I going to clean my hands now?”

You can’t say a thing, overwhelmed by this entire situation. Your mind already went blank by the time she put her hands on your busy length.