Practical Demonstration
Title: Practical Demonstration
Pairing: Yunho/Jaejoong
Rating: NC-17
Length: One-shot
Genre: Smut
Summary: Yunho hadn't been paying attention during Mr. Kim's lesson on sex, believing himself to be all-knowledgeable on the subject. However, when Mr. Kim asks him to stay behind after class, he discovers that there are still a few things left to learn…
A/N: You can read this fic in Russian here - translated by Maskil
Inspired by this macro, created by lady_monochrome:
“All right, class dismissed,” Kim Jaejoong said, hearing the bell ring. He watched as his pupils packed their belongings, speaking again before one in particular could leave. “Not you, Mr. Jung. You get to stay after class.”
Jung Yunho looked up, startled. Why did he have to stay behind!? Yeah, he hadn’t been listening to anything the teacher was saying, but neither had Yoochun! Why was only he being picked on?
“See you later,” Yoochun slapped him on the shoulder on his way out. “Good luck!”
Yunho huffed, grabbing his bag and walking up to the teacher’s desk.
“You wanted to see me, sir?”
Jaejoong looked up, regarding his student. “Yunho, would you like to tell me why you and Park Yoochun were passing notes throughout my class instead of listening, like you were supposed to be?”
Yunho rolled his eyes. “Sir, you were teaching us about sex. It’s not like I’ve never done it before - I figured I wouldn’t learn anything new. No offence.”
Jaejoong simply raised an eyebrow behind his black glasses.
“Not learn anything new? I was not aware that you’d engaged in homosexual activities, Mr. Jung.”
Predictably, Yunho spluttered. “W-what!? N-no, of course I haven’t!”
“Well then perhaps you should have been listening.” Jaejoong stood up and walked around his desk to face the student. “But, since you weren’t, I guess there’s no other option - I shall have to teach you about it now.”
“Uh, sir, I really don’t think I’m going to need to know about -”
“Quiet. Now, tell me what you already know, and we’ll work from there.” Jaejoong crossed his arms, leaning back against the desk.
Yunho continued to merely stand there, gaping at his teacher.
“Come on, Mr. Jung. I don’t have all day.”
“Uh, right,” stuttered Yunho. “Well, um… Guys… They uh, they do it in the ass…”
Jaejoong nodded. “Crude, but go on.”
The pupil looked contemplative for a moment or two, thinking hard. “To be honest sir, that’s really all I know…”
Sighing, Jaejoong pushed away from the desk. “I guess we’ll have to do a practical demonstration then.”
“What!?” Yunho exclaimed, startled.
Jaejoong stared at the other. “Well you’re not going to learn any other way, are you?” He turned to face his desk and began unbuttoning his trousers, ignoring Yunho’s flabbergasted expression. “Now, one thing you definitely need to know about is preparation.”
“Pre-preparation?” Yunho watched, both horrified and strangely aroused, as his teacher pulled his trousers and underwear (briefs, Yunho was interested to note) down to his knees. He was even more shocked when Mr. Kim bent over the hard wooden desk, exposing his taught behind.
“Yes, Yunho, preparation,” Jaejoong said exasperatedly. “You would have known that, had you been listening.” When he realised that his student wasn’t moving, he turned to look at him over his shoulder. “Well?”
“Well what!?” Yunho tried to keep his eyes firmly locked with his teacher’s, but he couldn’t help that his gaze would occasionally drift down to his bare bottom. It wasn’t his fault that his teacher had a nice ass! Even if he was a guy…
“Well prepare me.” Jaejoong spoke slowly, as though to a child.
Yunho shook his head, taking a half-step back. “You can’t be serious…”
“Oh but I am, Mr. Jung.”
Yunho could swear that Mr. Kim’s eyes were smouldering and it scared him a little.
He would admit that his teacher was an attractive man - soft-looking, light brown hair brushing against smooth, pale cheeks; large, emotive eyes, hidden behind thin, black-framed glasses; pouty, pink lips, made wet by a sharp red tongue; hard, solid body, shown off by his expensive, fitted clothes.
Okay, so maybe Mr. Kim was a very attractive man, but Yunho didn’t swing that way and he sure as hell wasn’t going to ‘prepare’ him, whatever that meant.
Jaejoong sighed, standing up straight. He kept his front pressed to the desk, hiding his growing erection.
“Yunho. This is serious. Anal sex requires preparation, and if you don’t know how to do that, then…”
“B-but I’m not planning on having anal sex!”
Smirking, Jaejoong turned his head to look at the younger. “Never?” When Yunho just continued to stare at him, he continued. “Lots of women enjoy anal sex too. They would also need preparation. As your teacher, I’m trying to help you learn what to do to. Now, are my efforts going to go to waste, or are you going to do as I ask?”
Yunho worried his lip, unsure. He’d heard that doing girls up the ass felt amazing, but as he’d just realised, maybe he wasn’t perfectly clear on how to go about it… He made a decision and dropped his bag on the floor before walking over to Mr. Kim.
“All right, what do I do?”
Jaejoong bent back over, grinning to himself. He reached across to the other side of the desk - drawing Yunho’s attention to his behind once again - and opened a drawer. He pulled out a tube of something and handed it to Yunho, who took it cautiously.
The young man looked down at it. “Lube!?” He asked incredulously.
“Well it would be rather painful to have anal sex without it,” Jaejoong said, very matter-of-factly. “And it is needed for the preparation, so I thought that I would get it out now.”
“You keep saying ‘preparation’,” Yunho stepped closer to the teacher. “Is that just like, lubing up your cock or something?”
Jaejoong looked over his shoulder at Yunho, an expression of disbelief on his handsome face. “No, Yunho.” He sighed. “You really weren’t listening, were you? Now I’m going to have to repeat myself… Okay, so tell me, before you have sex with a girl, what would you do?”
Yunho stared at the smaller man. “Uh… Put a condom on?”
Jaejoong closed his eyes in exasperation, realising that trying to get Yunho to work things out for himself was not going to work.
“Whilst I am glad that you are being safe, Mr. Jung, that is not the answer that I was hoping for. Fine, I shall walk you through it step by step. To begin, please coat three of your fingers with the lubricant.”
Yunho rolled his eyes at his teacher’s way of speaking. He couldn’t believe that the guy was only eight or nine years his senior; he both spoke and acted much older.
“Alright, they’re lubed up. Now what?”
Jaejoong let out a frustrated sigh. “What do you think? Put one inside me.”
“What!?” Yunho jumped back, staring alarmed at Jaejoong’s exposed behind as though it would suddenly bite him.
“That is how you prepare someone, Yunho. You insert your fingers - or other small objects, if you so wish - until the person is sufficiently stretched. Once they can easily take three fingers, you may start thinking about inserting a penis or other, larger objects.”
Yunho almost giggled at the word ‘penis’ coming from his teacher’s mouth, but he quickly regained his composure. Mr. Kim seriously wanted Yunho to finger him? Seriously?
Still a little wary, Yunho moved towards the older man again, eyes focused on the crease of his ass, and lubricated hand outstretched, at the ready. He hoped that he wasn’t misunderstanding what Mr. Kim was saying (not many ways he could take the instructions, really), or he was about to have one very shocked teacher on his hands… Literally.
Cautiously, Yunho placed his hand on Mr. Kim’s behind, parting the cheeks. When the teacher showed no reaction, he continued. He slowly ran his finger down the crevice until he reached the small hole, his heart beating rapidly. Yunho pressed lightly on the entrance and was startled when his finger suddenly slipped inside.
Jaejoong gasped, muscles clenching despite his attempt to remain calm and relaxed. How could he though, when his sexy-as-sin, jailbait pupil had his finger inside of him? He unconsciously rocked back slightly, taking Yunho’s finger the rest of the way in.
“Right, just like that,” Jaejoong said, pleased at how steady his voice was. “Now push it back and forth a little, maybe twist it, and if you can, try to find - ah!”
Yunho stilled, eyes going wide. “What was that!? Did I hurt you!? Sorry sir, I -”
“No no, Yunho,” Jaejoong took a deep breath. “No, that was good. Do you feel that little bump? That’s the prostate. It’s the male g-spot. Whilst preparing your partner, you want to make sure that you touch that as often as possible. It’ll relax and arouse them, making it easier to penetrate them later on.”
Rubbing the pad of his finger over the bump, Yunho marvelled at the feel of his teacher. His walls were squeezing his finger so tightly, and every time Yunho touched his prostate his muscles would twitch reflexively.
“Now, when you think I’m ready, I want you to insert another finger.”
Yunho smirked, quickly pushing a second finger in beside the first. The older man jerked slightly, a surprised sound coming from his throat, but that was all. He stood completely still as Yunho pumped his fingers in and out, occasionally brushing over his prostate, but more often than not avoiding it so as to tease the smaller man.
“Feel free to twist your fingers as well,” Jaejoong breathed. “It loosens the muscle, preparing it for something wider.” His ass clamped down firmly as Yunho did as he was told, and Jaejoong had to bite his lip hard to keep from letting a whimper escape.
“Like this, Mr. Kim?” Yunho asked, breathing heavily. He couldn’t believe that he was actually getting a little turned on by this… He was fingering a guy, for God’s sake! And his teacher, too!
“Uhn, yes, just like that.”
It took extreme willpower for Jaejoong to not start fucking himself on Yunho’s fingers. The younger seemed rather skilled at this, touching and rubbing in all the right ways, making Jaejoong’s cock pulse and leak.
“Do I add the next finger now?” Yunho wanted to see his teacher spread wider, see his whole body flushed with arousal.
Jaejoong nodded. “Whenever you think I’m ready.”
A third finger soon joined the other two, pushing in faster now, causing Jaejoong to knock slightly against the desk. Yunho twisted them harshly and Jaejoong was unable to stop himself from crying out, a hand quickly flying up to cover his mouth.
Yunho’s cock was straining in his boxers and he desperately hoped that Mr. Kim would allow the lesson to continue, allow Yunho to fuck him. The pupil knew that this was wrong and that they’d both be dead if they were caught, but right then he didn’t care. He had three fingers pushing into his sexy young teacher and he wanted to know what it would feel like to have his cock in the small hole as well.
“O-okay,” Jaejoong stammered, cursing himself for losing his cool. “That’s the preparation done… So you may remove your fingers now.”
“What if I don’t want to?” Yunho growled, thrusting them in harder and leaning over his teacher, breath caressing his neck.
“Yunho, remove your fingers.” The teacher’s voice was firm, an obvious order, and he was pleased that he managed to say it without stuttering.
Pouting, Yunho slowly withdrew his fingers, making sure to press on the smaller man’s prostate as he did so. He grinned as he felt Mr. Kim’s entrance spasm.
“What now, sir?”
Jaejoong took a deep breath, willing himself to regain some of the authority he started with. “Now for the actual thing. I presume that you are clean, yes?”
Yunho glanced down at the tent in his trousers. “Well I showered this morning so I should be…”
Resisting the urge to facepalm, Jaejoong re-phrased his question. “Whilst that’s nice to hear, what I meant was: do you have any sexual diseases?”
“Oh.” Yunho felt a little stupid. “No.”
“Good.” The teacher nodded, still facing away from his pupil. “Neither do I. As such, I think that it would be acceptable to continue without a condom. That way, you would be able to feel more. However, normally I would expect you to be safe and use some form of protection.”
“Always do,” Yunho said.
“Excellent. Now let us continue. You have stretched me adequately, but it would still be wise to lubricate your penis to make everything easier.”
Yunho winced, grabbing the tube of lube once again. “Do you have to keep saying words like ‘penis’? Can’t you call it a ‘cock’ or something?”
Jaejoong looked over his shoulder at the student, eyes narrowing. “Mr. Jung, this is a lesson in Biology - why would I not use the appropriate terms? If you wish to hear such vulgar language then you will have to wait until later. For now, I suggest that you do as I ask, and make sure that you are suitably prepared to enter me.”
“Whatever,” Yunho sighed. He quickly undid his trousers as the elder turned back around, a little embarrassed at the thought of his teacher seeing his privates, especially whilst he was aroused. He coated his cock in a thick layer of lube, not wanting to be scolded, and placed the tube back on the desk. “Now what?”
Jaejoong almost groaned in frustration. “Yunho, are you certain that you’ve had intercourse before, because you seem awfully clueless about these matters. Now, you are meant to insert your erection into my anal opening.”
“Are you sure you’ve had intercourse before, sir? You’re not making it very sexy…”
Yunho grasped his teacher’s hip with his left hand, surprised at the heat and softness that he felt. With his right, he positioned his straining member against the other’s hole, preparing to push in.
“It is not meant to be ‘sexy’, Yunho. This is a practical demonstration of - oh fuck God!”
Yunho smirked, amused at Mr. Kim’s reaction to having a cock slammed inside of him. He gripped the smaller man’s waist, fingers sneaking up under his shirt, and leant over to whisper in his ear.
“Sorry sir, I didn’t catch that… A practical demonstration of what?”
Jaejoong had a hand clamped over his mouth, his eyes wide behind his glasses, unwilling to make another sound. He shook his head frantically at Yunho’s question, not wanting to risk speaking.
The student merely grinned, pulling out only an inch or two before thrusting back in lightly. He could feel the other man’s inner walls encasing his cock so perfectly, so hot. It was like nothing he’d felt before, that tight heat sucking him in. He’d been with virgins before, but even they hadn’t felt as good as his teacher’s ass did, sheathing him in the most fantastic way.
“Y-you can do it harder than that,” Jaejoong finally managed to get out. “R-remember what I told you about the prostate…” His back was arching, body quivering with restraint. His entrance was repeatedly twitching, clamping down on Yunho, but he tried to control himself. He refused to beg for more, so he’d just have to order it instead.
“Ah, yeah…” Yunho pulled out further, pushing back in a bit more forcefully. The teacher whimpered and he was worried for a moment that he’d hurt him, but then he caught sight of Mr. Kim’s face and smirked.
The smaller man was flushed red, eyes shut and mouth open. His tongue came out to wet his lips and Yunho shoved in more harshly in response. Another sound escaped the teacher, face contorting in pleasure.
“Like this, Mr. Kim? Is this how I’m meant to be doing it?” Yunho’s hips began to move faster, pumping in and out of the older man with increasing speed.
“Yes, just like that…” Jaejoong’s voice was deep and rough, sparking something inside of Yunho. Never had a man made him hot before, but it seemed that his teacher was an exception.
“Tell me what else I should be doing, Mr. Kim,” the pupil whispered, lips just brushing the hair by Jaejoong’s ears. “You’re my teacher, right? Teach me…”
Jaejoong whined, the reminder that he was doing this with one of his students turning him on. It was forbidden and wrong, but it felt so right to have the young man’s cock stretching his hole so deliciously.
It may have been the end of the day, but there was still the possibility of somebody walking into the classroom. It excited Jaejoong, thrilled him that somebody could just walk in and see him getting fucked against the desk by his hottest student.
“Y-you should pleasure your partner,” Jaejoong stuttered.
“Am I not pleasuring you, Mr. Kim?” Yunho shifted his hips, hitting Jaejoong from a new angle and making him tremble.
“Y-your hand…” He took a deep breath. “You should pleasure your partner with your hand.”
Yunho thought for a moment, thrusts never faltering. “You want me to jerk you off?”
Jaejoong nodded, ashamed at his request but figuring that it was all in the name of ‘education’.
Biting his lip, Yunho contemplated what he should do. He’d never touched a guy sexually before and the thought scared him a little. Not to mention the fact that it would be his teacher…
He couldn’t deny, though, that he was slightly curious to see what it would be like. Would Mr. Kim be smaller than him? Or bigger? Longer, shorter, wider, thinner… What would be the man’s reaction when he touched him? How much pre-come would there be so far?
Deciding that as this was (supposedly) meant to be about learning, Yunho nodded, mentally preparing himself to touch another man’s hardness.
Yunho hesitantly trailed his right hand around from Jaejoong’s hip and slid it down to his pelvis. Tentatively, he took hold of the base of his teacher’s cock, wrapping his fingers around it. The almost imperceptible hitch in the older man’s breathing encouraged him, and he slowly slid his hand up, cupping the weeping head.
Jaejoong shivered, cock jumping in Yunho’s hold.
The taller smirked, gripping the hard member more firmly and beginning a brutal pace. He would roughly tug on his teacher’s cock as he thrust into him, hand moving in tandem with his hips.
Yunho plunged deep, feeling Jaejoong’s ass massage the whole length of his cock. The excessive lubrication made it easier, made him slide in effortlessly. He pounded against his teacher, Jaejoong gripping hard onto the edge of the desk, still trying to retain a modicum of composure. It was a losing battle, as every jerk of Yunho’s hand and every thrust of Yunho’s cock had him threatening to burst, no longer able to hold back his cries.
“Fuck, Mr. Kim… I-I’m getting close…”
Jaejoong shook his head, trying hard to remember how to speak. “Do not orgasm until I do, understand? Th-the bottom must always come first…”
Yunho groaned, head back and eyes squeezed tight. He wasn’t going to be able to last much longer, so he had to get the teacher off, now.
“Come then, Mr. Kim,” he whispered seductively into the smaller’s ear. “Come all over your desk and papers. Come with your student’s hand on your dick, his cock fucking your ass.”
Jaejoong moaned, body heating up at the dirty words. Giving in to his desires at last, he began to push back onto Yunho, taking him deeper, making him go faster. His cocked throbbed in the younger’s hold, red and dripping and so hard it hurt.
“Fuck, I wanna come inside you so bad,” Yunho murmured, driving in as hard as he could. “Fill you up… And watch it drip out… And make you clean it with your tongue…”
Those words finally pushed Jaejoong over the edge and he began shaking, orgasm rushing through him. He called out, voice strained, whilst his hole started clenching erratically, squeezing Yunho, and his cock pulsed, streams of white landing on the wooden desk.
Yunho gasped at the feeling surrounding his cock, the contractions more powerful than he’d ever felt inside of a girl. He tried to carry on thrusting, wanting the feeling to last as long as possible, but he soon released as well, coming long and hard inside of his teacher.
They both collapsed on the desk, panting, struggling to get their breath back. Jaejoong’s hole still twitched occasionally, causing Yunho to flinch from his sensitive cock being over-stimulated. He pulled out slowly, both wincing at the odd feeling.
After a minute or so Jaejoong began to wriggle, signalling Yunho to get off him. The younger complied, stepping back and giving the teacher room to stand up.
Quickly Yunho noticed that his flaccid cock was still on display and he hurried to tuck it back into his underwear, embarrassed. His eyes landed on Mr. Kim’s still exposed behind then, and indeed, Yunho’s come was slowly dripping out, leaving translucent streaks down the other’s legs. He gawked at the erotic sight.
With hands and legs shaking, Jaejoong reached down to pull his trousers back up, but he was stopped by Yunho. He turned his head, regarding his student curiously.
Yunho gulped, the smaller man’s face still flushed, eyes wide and pupils dilated. He looked thoroughly fucked and Yunho couldn’t help but feel a bit of pride, having been the one to make his teacher look that way.
Realising that Mr. Kim was waiting for an explanation as to why he stopped him, Yunho slipped his hands down and pushed two fingers into his teacher’s abused hole.
Jaejoong’s eyes fluttered shut, whole body jerking at the feeling. His entrance was still so sensitive, and to have Yunho’s fingers back in there, twirling around, was almost too much to take. When Yunho’s fingers left him he opened his eyes, about to ask his student what he thought he was doing, but his words died on his tongue.
Yunho’s fingers, wet with his own come, were placed mere centimetres from Jaejoong’s mouth. It was obvious what the younger wanted, what he wished for his teacher to do.
“Yunho,” Jaejoong said, pulling his trousers up quickly and fastening them. He stood up straight and looked the younger in the eye. “Do you really think that that is appropriate?”
“I don’t know, sir,” Yunho replied, fingers remaining in place. “I just fucked you against your desk, and I wouldn’t have thought that that was particularly appropriate, so…”
Jaejoong regarded Yunho for a moment, mind working rapidly. If he did this, things would change. Yes, he’d made the student take him up the ass in his classroom after school, but he could claim that he was just trying to teach him about anal intercourse (he doubted that anyone would believe him, but it was always worth a shot). If he did this though - if he licked the come off Yunho’s fingers - then it would be different. He could feel it.
Looking up at Yunho from under his eyelashes, Jaejoong slowly leant forwards, tongue outstretched.
★ ★ ★
A week later and Yunho was once again in Mr. Kim’s Biology lesson, passing notes to his friend. He wasn’t listening to whatever his teacher was rambling on about, far more interested in what Yoochun was telling him about the new kid with the huge ass.
“Mr. Jung.”
Yunho’s head shot up at the sound of his teacher’s voice. He saw the older man looking down at him, a stern expression on his face.
“Yes, sir?”
“I do not appreciate you passing notes in my class. You will stay behind so that I can be sure that you understood the lesson fully. Do I make myself clear?”
A grin slowly spread across Yunho’s face and he noticed a flash of desire in his teacher’s brown eyes. “Perfectly, sir.”
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Pairing: Yunho/Jaejoong
Rating: NC-17
Length: One-shot
Genre: Smut
Summary: Yunho hadn't been paying attention during Mr. Kim's lesson on sex, believing himself to be all-knowledgeable on the subject. However, when Mr. Kim asks him to stay behind after class, he discovers that there are still a few things left to learn…
A/N: You can read this fic in Russian here - translated by Maskil
Inspired by this macro, created by lady_monochrome:
“All right, class dismissed,” Kim Jaejoong said, hearing the bell ring. He watched as his pupils packed their belongings, speaking again before one in particular could leave. “Not you, Mr. Jung. You get to stay after class.”
Jung Yunho looked up, startled. Why did he have to stay behind!? Yeah, he hadn’t been listening to anything the teacher was saying, but neither had Yoochun! Why was only he being picked on?
“See you later,” Yoochun slapped him on the shoulder on his way out. “Good luck!”
Yunho huffed, grabbing his bag and walking up to the teacher’s desk.
“You wanted to see me, sir?”
Jaejoong looked up, regarding his student. “Yunho, would you like to tell me why you and Park Yoochun were passing notes throughout my class instead of listening, like you were supposed to be?”
Yunho rolled his eyes. “Sir, you were teaching us about sex. It’s not like I’ve never done it before - I figured I wouldn’t learn anything new. No offence.”
Jaejoong simply raised an eyebrow behind his black glasses.
“Not learn anything new? I was not aware that you’d engaged in homosexual activities, Mr. Jung.”
Predictably, Yunho spluttered. “W-what!? N-no, of course I haven’t!”
“Well then perhaps you should have been listening.” Jaejoong stood up and walked around his desk to face the student. “But, since you weren’t, I guess there’s no other option - I shall have to teach you about it now.”
“Uh, sir, I really don’t think I’m going to need to know about -”
“Quiet. Now, tell me what you already know, and we’ll work from there.” Jaejoong crossed his arms, leaning back against the desk.
Yunho continued to merely stand there, gaping at his teacher.
“Come on, Mr. Jung. I don’t have all day.”
“Uh, right,” stuttered Yunho. “Well, um… Guys… They uh, they do it in the ass…”
Jaejoong nodded. “Crude, but go on.”
The pupil looked contemplative for a moment or two, thinking hard. “To be honest sir, that’s really all I know…”
Sighing, Jaejoong pushed away from the desk. “I guess we’ll have to do a practical demonstration then.”
“What!?” Yunho exclaimed, startled.
Jaejoong stared at the other. “Well you’re not going to learn any other way, are you?” He turned to face his desk and began unbuttoning his trousers, ignoring Yunho’s flabbergasted expression. “Now, one thing you definitely need to know about is preparation.”
“Pre-preparation?” Yunho watched, both horrified and strangely aroused, as his teacher pulled his trousers and underwear (briefs, Yunho was interested to note) down to his knees. He was even more shocked when Mr. Kim bent over the hard wooden desk, exposing his taught behind.
“Yes, Yunho, preparation,” Jaejoong said exasperatedly. “You would have known that, had you been listening.” When he realised that his student wasn’t moving, he turned to look at him over his shoulder. “Well?”
“Well what!?” Yunho tried to keep his eyes firmly locked with his teacher’s, but he couldn’t help that his gaze would occasionally drift down to his bare bottom. It wasn’t his fault that his teacher had a nice ass! Even if he was a guy…
“Well prepare me.” Jaejoong spoke slowly, as though to a child.
Yunho shook his head, taking a half-step back. “You can’t be serious…”
“Oh but I am, Mr. Jung.”
Yunho could swear that Mr. Kim’s eyes were smouldering and it scared him a little.
He would admit that his teacher was an attractive man - soft-looking, light brown hair brushing against smooth, pale cheeks; large, emotive eyes, hidden behind thin, black-framed glasses; pouty, pink lips, made wet by a sharp red tongue; hard, solid body, shown off by his expensive, fitted clothes.
Okay, so maybe Mr. Kim was a very attractive man, but Yunho didn’t swing that way and he sure as hell wasn’t going to ‘prepare’ him, whatever that meant.
Jaejoong sighed, standing up straight. He kept his front pressed to the desk, hiding his growing erection.
“Yunho. This is serious. Anal sex requires preparation, and if you don’t know how to do that, then…”
“B-but I’m not planning on having anal sex!”
Smirking, Jaejoong turned his head to look at the younger. “Never?” When Yunho just continued to stare at him, he continued. “Lots of women enjoy anal sex too. They would also need preparation. As your teacher, I’m trying to help you learn what to do to. Now, are my efforts going to go to waste, or are you going to do as I ask?”
Yunho worried his lip, unsure. He’d heard that doing girls up the ass felt amazing, but as he’d just realised, maybe he wasn’t perfectly clear on how to go about it… He made a decision and dropped his bag on the floor before walking over to Mr. Kim.
“All right, what do I do?”
Jaejoong bent back over, grinning to himself. He reached across to the other side of the desk - drawing Yunho’s attention to his behind once again - and opened a drawer. He pulled out a tube of something and handed it to Yunho, who took it cautiously.
The young man looked down at it. “Lube!?” He asked incredulously.
“Well it would be rather painful to have anal sex without it,” Jaejoong said, very matter-of-factly. “And it is needed for the preparation, so I thought that I would get it out now.”
“You keep saying ‘preparation’,” Yunho stepped closer to the teacher. “Is that just like, lubing up your cock or something?”
Jaejoong looked over his shoulder at Yunho, an expression of disbelief on his handsome face. “No, Yunho.” He sighed. “You really weren’t listening, were you? Now I’m going to have to repeat myself… Okay, so tell me, before you have sex with a girl, what would you do?”
Yunho stared at the smaller man. “Uh… Put a condom on?”
Jaejoong closed his eyes in exasperation, realising that trying to get Yunho to work things out for himself was not going to work.
“Whilst I am glad that you are being safe, Mr. Jung, that is not the answer that I was hoping for. Fine, I shall walk you through it step by step. To begin, please coat three of your fingers with the lubricant.”
Yunho rolled his eyes at his teacher’s way of speaking. He couldn’t believe that the guy was only eight or nine years his senior; he both spoke and acted much older.
“Alright, they’re lubed up. Now what?”
Jaejoong let out a frustrated sigh. “What do you think? Put one inside me.”
“What!?” Yunho jumped back, staring alarmed at Jaejoong’s exposed behind as though it would suddenly bite him.
“That is how you prepare someone, Yunho. You insert your fingers - or other small objects, if you so wish - until the person is sufficiently stretched. Once they can easily take three fingers, you may start thinking about inserting a penis or other, larger objects.”
Yunho almost giggled at the word ‘penis’ coming from his teacher’s mouth, but he quickly regained his composure. Mr. Kim seriously wanted Yunho to finger him? Seriously?
Still a little wary, Yunho moved towards the older man again, eyes focused on the crease of his ass, and lubricated hand outstretched, at the ready. He hoped that he wasn’t misunderstanding what Mr. Kim was saying (not many ways he could take the instructions, really), or he was about to have one very shocked teacher on his hands… Literally.
Cautiously, Yunho placed his hand on Mr. Kim’s behind, parting the cheeks. When the teacher showed no reaction, he continued. He slowly ran his finger down the crevice until he reached the small hole, his heart beating rapidly. Yunho pressed lightly on the entrance and was startled when his finger suddenly slipped inside.
Jaejoong gasped, muscles clenching despite his attempt to remain calm and relaxed. How could he though, when his sexy-as-sin, jailbait pupil had his finger inside of him? He unconsciously rocked back slightly, taking Yunho’s finger the rest of the way in.
“Right, just like that,” Jaejoong said, pleased at how steady his voice was. “Now push it back and forth a little, maybe twist it, and if you can, try to find - ah!”
Yunho stilled, eyes going wide. “What was that!? Did I hurt you!? Sorry sir, I -”
“No no, Yunho,” Jaejoong took a deep breath. “No, that was good. Do you feel that little bump? That’s the prostate. It’s the male g-spot. Whilst preparing your partner, you want to make sure that you touch that as often as possible. It’ll relax and arouse them, making it easier to penetrate them later on.”
Rubbing the pad of his finger over the bump, Yunho marvelled at the feel of his teacher. His walls were squeezing his finger so tightly, and every time Yunho touched his prostate his muscles would twitch reflexively.
“Now, when you think I’m ready, I want you to insert another finger.”
Yunho smirked, quickly pushing a second finger in beside the first. The older man jerked slightly, a surprised sound coming from his throat, but that was all. He stood completely still as Yunho pumped his fingers in and out, occasionally brushing over his prostate, but more often than not avoiding it so as to tease the smaller man.
“Feel free to twist your fingers as well,” Jaejoong breathed. “It loosens the muscle, preparing it for something wider.” His ass clamped down firmly as Yunho did as he was told, and Jaejoong had to bite his lip hard to keep from letting a whimper escape.
“Like this, Mr. Kim?” Yunho asked, breathing heavily. He couldn’t believe that he was actually getting a little turned on by this… He was fingering a guy, for God’s sake! And his teacher, too!
“Uhn, yes, just like that.”
It took extreme willpower for Jaejoong to not start fucking himself on Yunho’s fingers. The younger seemed rather skilled at this, touching and rubbing in all the right ways, making Jaejoong’s cock pulse and leak.
“Do I add the next finger now?” Yunho wanted to see his teacher spread wider, see his whole body flushed with arousal.
Jaejoong nodded. “Whenever you think I’m ready.”
A third finger soon joined the other two, pushing in faster now, causing Jaejoong to knock slightly against the desk. Yunho twisted them harshly and Jaejoong was unable to stop himself from crying out, a hand quickly flying up to cover his mouth.
Yunho’s cock was straining in his boxers and he desperately hoped that Mr. Kim would allow the lesson to continue, allow Yunho to fuck him. The pupil knew that this was wrong and that they’d both be dead if they were caught, but right then he didn’t care. He had three fingers pushing into his sexy young teacher and he wanted to know what it would feel like to have his cock in the small hole as well.
“O-okay,” Jaejoong stammered, cursing himself for losing his cool. “That’s the preparation done… So you may remove your fingers now.”
“What if I don’t want to?” Yunho growled, thrusting them in harder and leaning over his teacher, breath caressing his neck.
“Yunho, remove your fingers.” The teacher’s voice was firm, an obvious order, and he was pleased that he managed to say it without stuttering.
Pouting, Yunho slowly withdrew his fingers, making sure to press on the smaller man’s prostate as he did so. He grinned as he felt Mr. Kim’s entrance spasm.
“What now, sir?”
Jaejoong took a deep breath, willing himself to regain some of the authority he started with. “Now for the actual thing. I presume that you are clean, yes?”
Yunho glanced down at the tent in his trousers. “Well I showered this morning so I should be…”
Resisting the urge to facepalm, Jaejoong re-phrased his question. “Whilst that’s nice to hear, what I meant was: do you have any sexual diseases?”
“Oh.” Yunho felt a little stupid. “No.”
“Good.” The teacher nodded, still facing away from his pupil. “Neither do I. As such, I think that it would be acceptable to continue without a condom. That way, you would be able to feel more. However, normally I would expect you to be safe and use some form of protection.”
“Always do,” Yunho said.
“Excellent. Now let us continue. You have stretched me adequately, but it would still be wise to lubricate your penis to make everything easier.”
Yunho winced, grabbing the tube of lube once again. “Do you have to keep saying words like ‘penis’? Can’t you call it a ‘cock’ or something?”
Jaejoong looked over his shoulder at the student, eyes narrowing. “Mr. Jung, this is a lesson in Biology - why would I not use the appropriate terms? If you wish to hear such vulgar language then you will have to wait until later. For now, I suggest that you do as I ask, and make sure that you are suitably prepared to enter me.”
“Whatever,” Yunho sighed. He quickly undid his trousers as the elder turned back around, a little embarrassed at the thought of his teacher seeing his privates, especially whilst he was aroused. He coated his cock in a thick layer of lube, not wanting to be scolded, and placed the tube back on the desk. “Now what?”
Jaejoong almost groaned in frustration. “Yunho, are you certain that you’ve had intercourse before, because you seem awfully clueless about these matters. Now, you are meant to insert your erection into my anal opening.”
“Are you sure you’ve had intercourse before, sir? You’re not making it very sexy…”
Yunho grasped his teacher’s hip with his left hand, surprised at the heat and softness that he felt. With his right, he positioned his straining member against the other’s hole, preparing to push in.
“It is not meant to be ‘sexy’, Yunho. This is a practical demonstration of - oh fuck God!”
Yunho smirked, amused at Mr. Kim’s reaction to having a cock slammed inside of him. He gripped the smaller man’s waist, fingers sneaking up under his shirt, and leant over to whisper in his ear.
“Sorry sir, I didn’t catch that… A practical demonstration of what?”
Jaejoong had a hand clamped over his mouth, his eyes wide behind his glasses, unwilling to make another sound. He shook his head frantically at Yunho’s question, not wanting to risk speaking.
The student merely grinned, pulling out only an inch or two before thrusting back in lightly. He could feel the other man’s inner walls encasing his cock so perfectly, so hot. It was like nothing he’d felt before, that tight heat sucking him in. He’d been with virgins before, but even they hadn’t felt as good as his teacher’s ass did, sheathing him in the most fantastic way.
“Y-you can do it harder than that,” Jaejoong finally managed to get out. “R-remember what I told you about the prostate…” His back was arching, body quivering with restraint. His entrance was repeatedly twitching, clamping down on Yunho, but he tried to control himself. He refused to beg for more, so he’d just have to order it instead.
“Ah, yeah…” Yunho pulled out further, pushing back in a bit more forcefully. The teacher whimpered and he was worried for a moment that he’d hurt him, but then he caught sight of Mr. Kim’s face and smirked.
The smaller man was flushed red, eyes shut and mouth open. His tongue came out to wet his lips and Yunho shoved in more harshly in response. Another sound escaped the teacher, face contorting in pleasure.
“Like this, Mr. Kim? Is this how I’m meant to be doing it?” Yunho’s hips began to move faster, pumping in and out of the older man with increasing speed.
“Yes, just like that…” Jaejoong’s voice was deep and rough, sparking something inside of Yunho. Never had a man made him hot before, but it seemed that his teacher was an exception.
“Tell me what else I should be doing, Mr. Kim,” the pupil whispered, lips just brushing the hair by Jaejoong’s ears. “You’re my teacher, right? Teach me…”
Jaejoong whined, the reminder that he was doing this with one of his students turning him on. It was forbidden and wrong, but it felt so right to have the young man’s cock stretching his hole so deliciously.
It may have been the end of the day, but there was still the possibility of somebody walking into the classroom. It excited Jaejoong, thrilled him that somebody could just walk in and see him getting fucked against the desk by his hottest student.
“Y-you should pleasure your partner,” Jaejoong stuttered.
“Am I not pleasuring you, Mr. Kim?” Yunho shifted his hips, hitting Jaejoong from a new angle and making him tremble.
“Y-your hand…” He took a deep breath. “You should pleasure your partner with your hand.”
Yunho thought for a moment, thrusts never faltering. “You want me to jerk you off?”
Jaejoong nodded, ashamed at his request but figuring that it was all in the name of ‘education’.
Biting his lip, Yunho contemplated what he should do. He’d never touched a guy sexually before and the thought scared him a little. Not to mention the fact that it would be his teacher…
He couldn’t deny, though, that he was slightly curious to see what it would be like. Would Mr. Kim be smaller than him? Or bigger? Longer, shorter, wider, thinner… What would be the man’s reaction when he touched him? How much pre-come would there be so far?
Deciding that as this was (supposedly) meant to be about learning, Yunho nodded, mentally preparing himself to touch another man’s hardness.
Yunho hesitantly trailed his right hand around from Jaejoong’s hip and slid it down to his pelvis. Tentatively, he took hold of the base of his teacher’s cock, wrapping his fingers around it. The almost imperceptible hitch in the older man’s breathing encouraged him, and he slowly slid his hand up, cupping the weeping head.
Jaejoong shivered, cock jumping in Yunho’s hold.
The taller smirked, gripping the hard member more firmly and beginning a brutal pace. He would roughly tug on his teacher’s cock as he thrust into him, hand moving in tandem with his hips.
Yunho plunged deep, feeling Jaejoong’s ass massage the whole length of his cock. The excessive lubrication made it easier, made him slide in effortlessly. He pounded against his teacher, Jaejoong gripping hard onto the edge of the desk, still trying to retain a modicum of composure. It was a losing battle, as every jerk of Yunho’s hand and every thrust of Yunho’s cock had him threatening to burst, no longer able to hold back his cries.
“Fuck, Mr. Kim… I-I’m getting close…”
Jaejoong shook his head, trying hard to remember how to speak. “Do not orgasm until I do, understand? Th-the bottom must always come first…”
Yunho groaned, head back and eyes squeezed tight. He wasn’t going to be able to last much longer, so he had to get the teacher off, now.
“Come then, Mr. Kim,” he whispered seductively into the smaller’s ear. “Come all over your desk and papers. Come with your student’s hand on your dick, his cock fucking your ass.”
Jaejoong moaned, body heating up at the dirty words. Giving in to his desires at last, he began to push back onto Yunho, taking him deeper, making him go faster. His cocked throbbed in the younger’s hold, red and dripping and so hard it hurt.
“Fuck, I wanna come inside you so bad,” Yunho murmured, driving in as hard as he could. “Fill you up… And watch it drip out… And make you clean it with your tongue…”
Those words finally pushed Jaejoong over the edge and he began shaking, orgasm rushing through him. He called out, voice strained, whilst his hole started clenching erratically, squeezing Yunho, and his cock pulsed, streams of white landing on the wooden desk.
Yunho gasped at the feeling surrounding his cock, the contractions more powerful than he’d ever felt inside of a girl. He tried to carry on thrusting, wanting the feeling to last as long as possible, but he soon released as well, coming long and hard inside of his teacher.
They both collapsed on the desk, panting, struggling to get their breath back. Jaejoong’s hole still twitched occasionally, causing Yunho to flinch from his sensitive cock being over-stimulated. He pulled out slowly, both wincing at the odd feeling.
After a minute or so Jaejoong began to wriggle, signalling Yunho to get off him. The younger complied, stepping back and giving the teacher room to stand up.
Quickly Yunho noticed that his flaccid cock was still on display and he hurried to tuck it back into his underwear, embarrassed. His eyes landed on Mr. Kim’s still exposed behind then, and indeed, Yunho’s come was slowly dripping out, leaving translucent streaks down the other’s legs. He gawked at the erotic sight.
With hands and legs shaking, Jaejoong reached down to pull his trousers back up, but he was stopped by Yunho. He turned his head, regarding his student curiously.
Yunho gulped, the smaller man’s face still flushed, eyes wide and pupils dilated. He looked thoroughly fucked and Yunho couldn’t help but feel a bit of pride, having been the one to make his teacher look that way.
Realising that Mr. Kim was waiting for an explanation as to why he stopped him, Yunho slipped his hands down and pushed two fingers into his teacher’s abused hole.
Jaejoong’s eyes fluttered shut, whole body jerking at the feeling. His entrance was still so sensitive, and to have Yunho’s fingers back in there, twirling around, was almost too much to take. When Yunho’s fingers left him he opened his eyes, about to ask his student what he thought he was doing, but his words died on his tongue.
Yunho’s fingers, wet with his own come, were placed mere centimetres from Jaejoong’s mouth. It was obvious what the younger wanted, what he wished for his teacher to do.
“Yunho,” Jaejoong said, pulling his trousers up quickly and fastening them. He stood up straight and looked the younger in the eye. “Do you really think that that is appropriate?”
“I don’t know, sir,” Yunho replied, fingers remaining in place. “I just fucked you against your desk, and I wouldn’t have thought that that was particularly appropriate, so…”
Jaejoong regarded Yunho for a moment, mind working rapidly. If he did this, things would change. Yes, he’d made the student take him up the ass in his classroom after school, but he could claim that he was just trying to teach him about anal intercourse (he doubted that anyone would believe him, but it was always worth a shot). If he did this though - if he licked the come off Yunho’s fingers - then it would be different. He could feel it.
Looking up at Yunho from under his eyelashes, Jaejoong slowly leant forwards, tongue outstretched.
★ ★ ★
A week later and Yunho was once again in Mr. Kim’s Biology lesson, passing notes to his friend. He wasn’t listening to whatever his teacher was rambling on about, far more interested in what Yoochun was telling him about the new kid with the huge ass.
“Mr. Jung.”
Yunho’s head shot up at the sound of his teacher’s voice. He saw the older man looking down at him, a stern expression on his face.
“Yes, sir?”
“I do not appreciate you passing notes in my class. You will stay behind so that I can be sure that you understood the lesson fully. Do I make myself clear?”
A grin slowly spread across Yunho’s face and he noticed a flash of desire in his teacher’s brown eyes. “Perfectly, sir.”
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