no textbooks here — JJK
Summary: being a model in the art class was common for you, but this time, you gave a chance to be the female model in biology class. it was for educational purposes anyway, how far could it go?
Pairing: male model jungkook x female model oc
Genre: Smut
Warnings: human sexuality/ biology class au, university au, voyeurism, unprotected sex (DO NOTTT unless you wanna be a mama) public sex, sex ed au, nipple stimulation, cock stimulation, kissing, multiple orgasm f, missionary, riding, cumming inside, no use of contraceptives specified, shy jk at first, they both are so cute at the end.
Word count: 5k+
Writer: riri🪵
Writer’s note: omg its finally here! i was thinking to write smth ab this ever since i read a voyeurism smut ab sex ed and i hadddd to write one. i love how cute jk is. i love the scenes where they well… get passionate. too cute ahhh. lemme know if you liked it. to be added in the taglist, fill the google form given below or leave a comment!
MASTERLIST
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You paused for a moment, taking a deep breath before nervously pushing open the classroom door. The soft creak of the hinges seemed louder in the stillness, amplifying your unease. As you stepped inside, your eyes immediately scanned the room. It was as you expected—empty, save for one person seated at the front: Mr. Jung, the lecturer you had been told about. His presence was commanding but gentle, his smile warm and welcoming, like a ray of sunshine on an otherwise dreary day.
“Come in, come in!” he called out with a bright tone, his gaze locking onto you as you hovered awkwardly in the doorway. His voice had a way of cutting through the silence, easing some of the tension you hadn’t realized you were carrying. You stepped forward, your footsteps quiet but deliberate as you made your way to his desk, each step a small victory over your nerves.
“It’s great to meet you,” Mr. Jung said with a friendly nod, his voice smooth and calm. His smile lingered, putting you at ease, if only slightly. He pushed a sheet of paper across the desk in your direction, his movements unhurried. “I just need you to fill out this liability waiver.”
The words were said so casually, but the simple task still felt like a small hurdle. You stood across from him, fingers lightly brushing the paper as you picked it up, your heart still racing just a bit, though his calm demeanor had begun to settle the unease that had gripped you since you walked in.
“Just the standard agreement,” Mr. Jung continued with a calm, practiced tone. “You’ll be paid at the end of the class. And... you’re aware that this is a practical demonstration, meaning you’ll be fully naked?”
“Yes... Of c-course,” you stammered, the words tumbling out awkwardly. You reached for a pen from the stand, trying to ignore the sudden wave of nervousness. Your eyes skimmed over the document—standard terms, conditions, rules, payment details, and all that. You’d done this sort of thing before for life drawing classes in the art department, so the nudity didn’t bother you as much as it used to. Still, this was the biology department, and that made it feel... different. Without much thought, you roughly scribbled ‘Y/N’ at the bottom of the page, the pen shaking just a little in your hand.
As you set the pen down, your gaze drifted around the room once more, and that’s when you noticed something or rather, someone you hadn’t before. Sitting off to the side, near the blackboard, was a guy you hadn’t seen when you first walked in. He was quiet, almost too still, which explained why he had escaped your attention earlier.
He looked up, and your breath hitched for a moment. His piercings were the first thing you noticed. his lips, eyebrow, and ears all adorned with silver hoops and studs that caught the light. Despite his edgy appearance, his eyes were surprisingly soft, a stark contrast to his sharp jawline and the strength in his build. Even beneath the loose, black T-shirt he wore, you could tell he was well-muscled, his broad shoulders and solid frame evident.
Your gaze continued downward, noticing his dark blue jeans tucked into chunky, black combat boots. His medium-length curly hair was pulled into a loose ponytail, a few strands escaping to frame his face. Everything about him radiated a kind of effortless cool. And, if you were being honest, this man was HOT.
You swallowed hard, trying to keep your composure as you realized just how much this guy's presence added to the tension simmering beneath the surface.
He glanced at you for just a fraction of a second, barely acknowledging your presence before averting his gaze, his expression unreadable. It was almost as if he didn’t want to make eye contact. “This is Jungkook, third-year, and the male model for today’s demonstration,” Mr. Jung explained, nodding toward the guy. “Please, take a seat next to him.”
You gave a quick nod and made your way over, sitting down in the chair beside him. Jungkook’s hands rested in his lap, fingers nervously intertwined. It surprised you to see that, beneath his tough, bad-boy exterior, he seemed just as anxious as you were. Sure, he was undeniably attractive—more than that, really. but the way he fidgeted made him look kind of... cute. You couldn't help but wonder how someone who appeared so effortlessly cool could be just as nervous about this as you were.
And then it hit you: you were both about to be naked. Fully.
But, of course, it was purely for educational purposes—nothing more than a biology lesson where the two of you were simply models helping students learn. Still, the thought had your stomach doing somersaults.
You cleared your throat, hoping to ease the tension between you two. “Hey…are you nervous?” you asked, leaning slightly toward him, trying to break the ice.
Before Jungkook could respond, the door swung open with a loud bang, and a flood of students poured in, filling the once-quiet room with laughter and chatter. You watched as they settled into their individual seats, each equipped with small, built-in desks, their attention mostly focused on their own conversations rather than the two of you.
Whatever nervous conversation you had hoped to start was quickly drowned out by the buzz of the classroom coming to life. You stole another glance at Jungkook, catching him briefly biting his lip before his gaze returned to his lap. It was clear neither of you was prepared for what was about to happen, but there wasn’t much time to dwell on that now.
Once the room settled and Mr. Jung began the lesson, you couldn't help but scan the students seated before you. Their eyes were on you-curious, almost probing. You were relieved that they were all first years, strangers whose names and faces you didn't know. It made things a little easier. Still, a few boys in the crowd kept sneaking glances in your direction, and you swore you caught some of them smirking, making your nerves spike even more.
After about five minutes of introductory remarks, Professor Jung's voice called both you and Jungkook to the front of the room. Your stomach twisted as you slowly stood up, feeling Jungkook rise just behind you. The two of you walked forward in unison, the students' gazes growing heavier with every step.
"Good morning, everyone," Mr. Jung addressed the class. "Meet Y/N Y/L/N and Jeon Jungkook. They'll be the models for today's lesson." His voice carried easily through the room, formal yet calm, as though what was about to happen was routine.
Then he turned to face both of you. "If you could both remove your clothes, please," he said, his tone polite but firm. You felt a sharp wave of mixture of excitement and anxiety rise within you, knowing the moment had finally come. and you two began two began to undress in front of the class.
You always enjoyed the thrill you got from being naked in front of the art classes you had modeled in. You like being a muse. You liked the feeling of all their eyes on your body and you expected this to be no different. You pulled off your white sweater over your head, followed by your tank top. You slowly began to unbutton your baggy jeans and slipped them down to the floor, pulling off each leg in turn until you were just in the simple baby pink underwear you had chosen to wear today.
You glanced next to you, where Jungkook was also down to his Calvin Klein underpants. You glanced over as he pulled them down and almost gasped out loud. His cock, although soft, was massive. You could see its outline from the white underwear he was wearing. It hung down limply between his legs, framed by a thin patch of newly grown hair, as if shaved recently.
You hastily turned your eyes back to the class and unhooked your bra, exposing your firm breasts. Then you removed the final item of your clothing, your panties, slipping them down your knees, revealing your own trimmed bush to the watching eyes. Not gonna lie, you were kinda embarrassed. You could have shaved or waxed. But you were here as a model anyway. You just wanted your paycheck for the day.
Your eyes scanned through the crowd. Some of the students looked embarrassed, red in the face, others looked excited. One boy right at the front was watching both of you with curious eyes, a big grin on his mouth. You and Jungkook stood there, upright and completely naked, as Professor Jung walked back and forth in front of you both, talking about various parts of anatomy and pointing at them by his telescopic pointer.
"Here we see,the female nipples are not yet aroused. The areola are widened and flat and the nipples themselves are not yet hard." Mr Jung explained, the end of the pointer hovering an inch from one of your nipples.
"And below," he continued, moving the pointer to indicate the area between your legs, "Is the Vulva. Not to be confused with the Vagina, of course, which is the interior part we can't see at the moment. In this, as you can see, the subject has chosen only to trim and not remove her pubic hair."
Some of the students nodded, while others just kept gaping at you. You were enjoying them all looking yourself naked, especially the guy in the front with a strange twinkle in his eyes. You felt yourself getting a bit aroused, your heart thumping loudly in your chest.
Mr Jung then moved on to Jungkook, pointing out at his much smaller nipples than his penis and testicles. The pointer then moved to his dick and balls, as the professor went on about the anatomy of a male’s cock. It was unusual that he made no mention of the fact that Jungkook’s cock was well…. big.
"Okay," Mr Jung said, striding back in front of you. "Y/N, if you could lie on the desk please? Yes, like that, lift your legs up. Perfect.”
You followed Mr Jung’s instructions and laid on the desk, your feet facing the students. Under his direction, you opened your legs up and put your feet on the desk so that your opening was all on display of the students now. You felt a strange feeling of thrill arising in your chest yet again, but you couldn’t see the reactions of the crowd, as you were looking up at the ceiling.
Soon after, Professor Jung began indicating parts of your vulva with his pointer.
"This outer area here is the labia majora," he explained, the cold metal of the pointer touching your lower petals, making your lips slightly open because of the sensation.
"The vaginal opening, and above the labia minora. This subject has fairly small labia minora but it's not uncommon for them to be much bigger and extend beyond the labia majora." Mr Jung continued, the pointer gently kept touching you, as if almost being teased. You felt yourself getting wet from the sensation and kept praying that it wouldn’t be visible.
"This is the urethral opening where urine is excreted from and also female ejaculate, we'll cover that in week five. And finally, the clitoris, also called the clit. Boys take careful note exactly where that is." He joked as the pointer came to rest on my clit, nestled under its hood. The class tittered dutifully.
"Thank you Y/N, you can stand up again," Mr Jung asked. Once again, You both stood naked and motionless before the class as he continued to drone on about the concept, that was arousal now. Soon again, Mr Jung turned to both of you again.
"Now, remember how we saw that the subject was not showing any signs of arousal…?"
There were a few nods from the class, and Mr Jung smiled. "Jungkook, can you rub or suck Y/N’s nipples please? We need you to stimulate them, and we’ll see what outcome we get from that.”
Jungkook glanced at you nervously, and then made his way to you until he was facing you. He lifted one hand up to your breast and cupped it gently, then very carefully he rubbed your nipple with his thumb. It felt nice and you felt a burst of pleasure rush through you.
"Look!" Professor Jung said, his voice was getting excited. “as we expect, the areola has tightened and contracted and the nipple has hardened as blood has rushed into it..”You were enjoying the stimulation Jungkook was providing you by using your tits as stress balls that you felt your breathing was getting deeper. Thats when you heard Mr Jung’s voice again.
"See how the subject's breathing has also changed. Jungkook, give the other one a suck, see how much you can stimulate it."
Jungkook bent down and took your other sensitive peak into his mouth, his tongue, warm and wet, lapping against your skin as if trying to explore the most of it. He started sucking more effectively, his teeth gently grazing on your nub, making you feel hot and bothered. You let out an involuntary gasp, which seemed to please the professor to heights as he gestured excitedly to the class.
"Okay, that's enough," He said as Jungkook returned to his original position beside you. The professor indicated your saliva glistened nipple with the pointer, and flicked it back and forth with the end, making you gasp again.
"Look, it's very hard and so much larger now. That's the result of the extra stimulation we saw. There are other signs of arousal we can look at on the female in a moment, but first let's have a look at arousal on the male. Is there anyone who can tell me the most obvious signs of arousal in the male of the species?"
There was a slight hesitation evident in the class which was quite expected and understandable. After a few seconds, a girl in the left wearing yellow shirt cautiously put hand up.
"Erection?" she asked, biting her lip in nervousness and embarrassment.
"Exactly!"Mr Jung chirped. "Increased heart rate, change in breathing, even hardened nipples are some signs when a male is sexually aroused, but the most obvious sign will be the enlargement in penis size as the blood rushes through the Male genitalia, also called erection."
Mr Jung turned back to you, "Y/N, can you get on your knees and stimulate Jungkook’s penis with your mouth please?”
You almost got a heart attack as you heard that. Yes, you were here just for a biology lesson but the thought of sucking Jungkook’s huge cock in front of the whole class sent a bolt of lightning straight to your cunt. The professor reached behind the desk and handed you a cushion, that you put on the floor in front of Jungkook’s feet and knelt on it, your knees buried in it for support. Jungkook’s cock was inches from your face. It was still soft, but long. You gingerly reached up and held it, your hand surrounding all the way round his girth.
You felt the warm member twitch in your hand, as you wrapped your other hand around it too. Its bulbous head was red and there were three prominent veins visible on it. You took a dee breath before leaning in and putting his thick shaft in your mouth and you knew that now, it was Jungkook’s turn to start breathing heavily.
As your tongue played with the head of his cock, you swore you heard an ‘ah’ leave his mouth, his Adam’s apple bobbing as you felt it pulsing and swelling. You bobbed your head back and forth, only getting a couple of inches in your mouth, but using your hands to jerk his shaft too.
The class was absolutely silent and they watched in rapt attention as you continued to work on him. You could feel their stares on both of you. You felt kinda excited and thrilled doing this in front of so many people that the weird pleasure caused your cunt get more wet with your slick, aching with need. You took his cock out of your mouth and looked up at it, still holding it in both hands. It was fully erect now, warm and slick with your saliva.
"Perfect!" Mr Jung exclaimed, "And quite an impressive specimen as you can see. Notice how the veins in the penis have become more prominent and also how the scrotum has become tense and doesn't hang down so low. Thank you Y/N, I think you can let go now." he said, causing a ripple of nervous laughter around the class and lightening the tension.
You stood up and came back to your original position, wiping the wetness around your mouth and chin with the back of your hand. Jungkook meanwhile, turned back to face the front, his big cock still pointing straight upwards in salute.
"Now, I mentioned there were other signs of female arousal. Let's see if any have presented themselves. Y/N, if you could turn around and bend over the desk for us please?”
You did as he asked, soon following his next instruction to spread your lips with your hands.
You were bent over the desk now, your hands on your cheeks spreading them apart to give the audience a view of your asshole and cunt wide open. You felt the cold metal of the telescopic pointer against your ass when you heard professor Jung again.
"So, who can tell me what signs of arousal we can see here?”
You couldn’t see who was talking, but a guy with a deep voice cleared his throat and spoke up, "She's wet professor,"
"Good," said the professor, "The vagina has produced some fluid to aid in lubrication, and you can see it's practically dripping out in this case. The act of stimulating her partner has clearly caused her to become quite aroused. Anything else?"
There was silence from the class. "Come on," he encouraged.
After a few more moments, a nervous female voice said "Labia are engorged?"
"Yes! You can see that is quite obvious here," the pointer touched your lips. "In fact, the whole vulva is slightly swollen and engorged with blood now. Her clitoris also looks a lot bigger and redder now." You just stood there, bent over the desk, your nipples pressed against the cool wood as everyone stared at your swollen hole.
“On to the next part of the demonstration. Y/N, can you come round the side of the desk please, yes bend over the desk again. That's right, so they can see you from the side. And Jeon, come behind her and penetrate her."
You instantly felt your heart racing at thousand miles per hour as soon as you heard the professor say that. This man, with a HUGE dick was going to what, fuck you in front of literally everyone? Considering your state right now, you desperately wanted him to fuck you, as you could feel your pussy throb for him, but in front of the class? It was kinda… interesting but it sure was a turn on for you.
You felt Jungkook approach you from behind, his hands lightly rubbing the flesh of my ass cheeks, his hardness pressed against your opening. You could feel his head teasing your folds when he slid himself inside your pussy in one swift movement. You cried out at the feeling of being stretched and opened by him, even though you were wet as fuck. Being filled up by his cock let pleasure rushed through your body and you felt every part of yourself tingling with energy.
You were bent over the desk, your head turned to the class. You could see their faces watching You as Jungkook started thrust inside you, your cunt gripping him tighter after another thrust.
“Ah fuck, so tight!” Jungkook moaned out, his pace quite rough as his one hand was on your cheek, spreading them apart so he could see your asshole and pussy clenching around him, swallowing every inch of him. Your loud cry with every thrust only fueled his arousal as he fucked you with reckless abandon.
The professor was pacing up and down, still talking to the class, occasionally gesturing towards both as he explained something. Either of you both couldn't understand what he was saying, your whole attention was taken up by the relentless pleasure. You felt a pit in your stomach as you felt a tingling sensation of climax rising inside you, which made you slightly anxious; you felt it would be embarrassing to lose control and orgasm in front of the class.
Suddenly, professor Jung’s voice interrupted, "Stop right there then Jungkook, that's great."
Jungkook breathed out, and pulled out, as you let out a whispered whine and glanced around. He held his hard cock in one hand and it was covered in your essence. You felt empty and open, as if something you needed had been taken away from you and left you incomplete. The professor was pointing out the creamy wetness on Jungkook’s cock.
"Okay, I think it would be interesting to demonstrate a couple of other key sexual positions." Mr Jung continued. "Y/N, would you mind getting on your back on the desk so we can demonstrate the missionary position?”
You nodded and laid on the hard desk before professor Jung passed you the cushion to put under your head. Luckily, it was a sturdy, old fashioned oak desk, and it hardly moved as Jungkook added his weight to it, climbing on top of you between your legs.
"Now, we saw in the previous position that the penis can stimulate the g-spot, but the clitoris would need manual stimulation. In the missionary position however, the male's pubic bone can provide some clitoral stimulation." He then continued to say something about it being the most common position, but at that point, Jungkook’s huge cock entered you again and you completely switched off.
Our gaze locked together, Jungkook began to fuck you hard again, both of you breathing heavily as his one hand groped your right breast. You loved the feeling of him inside you, fucking you as deep as he could go, and you felt the same feeling rising up in you again.”
"Jungkook, please. Can we demonstrate some kissing, let's try to make it slightly realistic for the class." professor Jung told him, before going back to talking to the class about how the vaginal canal lengthens during arousal.
Jungkook leaned over, his lips grazing over yours as he sucked on your bottom lip, his tongue grazing between them as if seeing permission to enter your mouth, and in the next moment, you felt his tongue inside your mouth as you both let out a shaky moan. He was warm, and tasted of mint. His loosened locks from the ponytail hair hung down over your face.
The combined sensation of the passionate kiss with hard thrusting into your core suddenly spiraled you out of control and you felt myself go over the edge. An intense orgasm washed over you, consuming your whole body. You screamed and dug your fingers into Jungkook’s back as you rode wave after wave of pleasure that coursed through you, your pussy convulsing violently.
“oh my god!” you breathed out, throwing your head back in pleasure.
Jungkook slowed, and kissed you again as you came down from your high. Mr Jung was continuing to talk to the class, "So, we weren't going to do the female orgasm until week three, but never mind. As our subjects have accidentally demonstrated already, it's interesting to note that only around 25% of females can climax from penetration alone."
Jungkook was slowly moving his cock in and out of your soaking cunt now, giving you a break after your orgasm, but it felt amazing. You were already hoping that you’d be able to meet up with him privately for a more intimate sex session. And he was a great kisser.
"Fantastic," said the professor, "But we're running out of time, so let's move on to the male orgasm." You heard a groan, this time from Jungkook almost like a whine as he pulled out from you, and got off from the table, helping you do the same.
Mr Jung fetched a chair and placed it in front of the class. "Jungkook, please on the chair. and Y/N, if you mount him. Let's make sure everyone can see properly." Jungkook followed, sitting on the chair, facing the crowd as you walked over to where Jungkook was sitting on the chair, your legs weak and shaking from the orgasm. You could feel your juices running down your thighs. You glanced at the crowd once and saw they were squirming in their seats looking all hot and bothered.
You turned my back on the class and straddled Jungkook, sinking down onto his cock, feeling him filling you once again. “Oh my god, Y/N.” Jungkook moaned, throwing his head back from the sensation.
Professor Jung was behind you pointing out the details of the penetration and how your lips gripped his penis and-all-that. He pointed to your exposed asshole, "We'll cover anal sex in week four.”
You started to ride Jungkook, wrapping your arms around him as you rode him on the chair. You wanted the sensations to last forever, the thought of thirty pairs of eyes watching your lips wrapped around his cock only spurred you on even more. You started fucking Jungkook as hard as you could, leaning in to thrust your tongue in his mouth.
"Okay Jungkook, when you're ready you can climax inside her." Mr Jung said, folding his arms and stepping back slightly to allow the class a good view. Jungkook hands grabbed your ass and he spread your ass with his fingers as you rode him.
“Oh yes, fuck! yes” You moaned out as you felt yourself coming again. You cried out as your whole body shook and your cunt contracted around his swollen meat. His fingers gripped your ass tightly, and he let out a low groan as you felt him unload his hot ropes of cum inside you, his cock throbbing and pulsing.
You held each other tightly as you took heavy breaths. You saw how worn out he was, how his big doe eyes were staring into your, and how his bottom lip twitched slightly as he lets out ragged breaths. You could see his mole under his bottom lip and a scar on his left cheek from the first time up this close.
He was beautiful.
You couldn’t help yourself, as you grabbed his face in your hands and kissed him sensually, to which he immediately responded to, kissing you back gently, as he felt you thumb caressing his scarred cheek. Even the professor was momentarily speechless. There was not a sound from anyone in the class.
Finally, You pulled off, breathing heavily and lifted yourself off his cock and floods of cum poured out of you, covering Jungkook’s cock and thighs with your slick and his release. Both of you were in quite a state, covered in sweat and cum.
Mr Jung quickly regained his composure, his signature smile back in his face. "An excellent demonstration from our two models." he began, "Please give them a round of applause."There was a smattering of clapping from the class for a while before he continued.
"The semen in this position is leaking out of the female. If they were having sex for breeding purposes, the missionary position would be better."
The bell for the end of the lesson rang and he raised his voice over the sounds of the rest of the class getting to their feet and packing up their things. "The homework for this week, please try to engage in the sexual act yourself with as many partners as possible, but please ensure to use protection and get tested for HIV with your partner. Better be safer than sorry. Also, I'd like two thousand words on your experiences, due in before the lesson next week."
The class filed out and Jungkook and you retrieved your clothes and hastily got dressed. The professor came up to us with a smile.
"Not too bad for a first attempt," he said, "Same time next week. you’ll get your pay by 6 in the evening.” He smiled as he exited the classroom, leaving both of you alone in the classroom. You sighed as started you started to walk up to the door to leave before you heard Jungkook’s voice behind you, stopping you in your tracks.
“Hey… Y/N?” He took some calculated steps towards you, his hand shoved in his pocket as he continued,
“I had well… fun in today’s lesson.”
You bit your lips nervously, nodding slightly, “I did too. You were amazing.”
Your words caused Jungkook to chuckle a little, as he walked close to you, looking down at you. “I’d want to experience everything with you again. Not in lesson’s though….”
You nodded, before he continued.
“You wanna go get coffee to celebrate our demonstration with me after you get cleaned up? I’ll wait for you outside the locker room’s bathroom. You can take as much time as you want.”
You could feel your cheeks heating up, you were definitely flustered.
“I’d love too….”
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-riri🥞