UNTEACHABLE

「smut」

top!donghyuck
bottom!jaemin

[in which life gets a little complicated for two childhood friends when one of them becomes the other's teacher]

childhood friends came in many shapes and sizes, races and nationalities, personalities and circumstances. there was nothing stopping a kid from befriending anyone or anything, and supposedly that was the beauty of early youth. though typically, one would picture a couple of toddlers racing around the back yard, same height, same age, similar interests.

not donghyuck and jaemin.

when the younger of the two was five, hyuck was eleven. he was a full six years older than the little brat who loved causing trouble, and they'd never have met had their parents not gotten so close through the local bar's game nights. it was like fate was bored, and so it matched them up to see how disastrous it could be.

"i'm telling your mum you're stealing sweets," jaemin taunted, tugging aggressively at the taller's shirt hem and attempting to pull him away from the high up cupboards.

"you are such a little shit," the preteen glowered, "what do you want?!"

"hide and seek, hide and seek, hide and seek!"

"you're literally the size of a grain of rice," the brunette hissed, "you can hide anywhere! i'm too tall!"

"i'm not a grain of rice!" jaemin whined, "i'm a big boy!"

"'big boy' my ass, go and annoy someone else. watch some tv or something."

"mum!"

donghyuck growled, picking the child up into his arms and slapping his hand over the smaller's mouth to muffle the yelling. "would you shut it? god, i'll play with you...just be quiet!"

the cheeky kid licked his palm grossly and wormed out of his grip, landing on his feet when he hit the ground. "count to thirty. and no cheating."

i'll count to thirty then strangle you, hyuck thought bitterly, though rolled his eyes and turned his back on him, starting to count. jaemin giggled excitedly and ran off through the na household, finding a safe and secure location to hide.

as much as they irritated the hell out of each other, growing up together was actually a lot of fun. once jaemin was adamant about growing up faster to match the boy he admired the most, the annoying 'little kid' phase ended.

once the teenager reached eighteen, his little friend was only twelve. they still had to see each other equally as often as ever, for donghyuck was the designated babysitter. the younger's parents trusted him with their son, and no one else. so there was an awful lot to prove.

"i lost another tooth!" the brunette cheered while wandering into the kitchen where donghyuck was trying to make a meal. "i'm getting so old."

"so old," the other chuckled. "your baby teeth have taken a goddamn lifetime to drop. what was the holdup?"

"there was no holdup!" the younger insisted, sitting up to the island in the centre of the space to watch the now blonde cook. "i am perfectly on time."

"kiddo, you lost your first tooth when you were eight. you're late as hell to the party."

jaemin's heart shattered as he listened to him. all this time he'd been trying to grow up faster so that donghyuck would stop treating him like a child...but nothing seemed to work. it also felt like all his friends at school were ageing around him...faster than him. heck, the girls were starting to develop shapes and figures now...why was he so slow? "we're having some sort of talk on monday," he sighed, leaning dismally on his palm and feeling all defeated now.

"oh?" the blonde arched his brow before throwing some soy sauce into the stir-fry. "what kind of 'talk'?"

"i don't know. everyone else does, but they won't tell me. it's just known as 'the talk'."

oh shit, the older inwardly grimaced, feeling pretty bad for jaemin that he was the one left behind all the time...but also nervous that he'd come home with weird questions for him. he remembered when he himself had been enlightened on sex education, and his parents were up all night trying to explain the ins and outs of it to him.

"since everyone else is leaving you in the dark..." he murmured, massaging his temples and wondering why the hell he was doing this. "um...i suppose i could give you a few pointers."

"like what?"

"okay," hyuck hummed, "let's see..."

"yay! hyuckie got his degree!" mrs. lee squealed so excitedly as both her family and the na family were situated in a cute little restaurant for lunch. the sun was out, so they were perched outside where the birds could be heard singing and life went on around them. "well done," she pinched her now twenty-four-year-old son's cheek. "i knew you could do it."

"that's brilliant, donghyuck. who'd have thought you'd decide to teach chemistry, huh?" jaemin's father gave him a pat on the back. "hopefully nana will use you as a role model."

"thanks guys," the blonde smiled faintly, watching his friend across the table with a victorious smirk. jaemin was still only eighteen, and in his second last year of high school. it was always the same story for him...donghyuck racing off ahead where he couldn't reach. and as he'd suspected of himself, there was no winning the nice way. his class were all fully matured, having sex, studying extra to get into college easier, partying. the current pinkette was extremely frustrated that he wasn't anywhere near those yet.

"don't worry," hyuck muttered from across the table now that their parents were preoccupied with talking about their futures. "i'll make sure to teach you properly."

"wh-what?"

all hell broke loose in na jaemin's life as soon as he reached his final year. lee donghyuck, as promised, started working as both the chemistry teacher for his class, and a physical education teacher, though not for the younger.

it sounded fine to begin with, as the pink-haired student wouldn't have minded the opportunity to stare at his gorgeous childhood friend all day. but the reality of it was a little different. it felt as though hyuck had meant other things when he uttered those interesting words that day at the family lunch.

"c'mon, nana. you don't want to fall behind, do you?" the blonde teased, having the teen pinned against his own bed when their parents had gone out for yet another game night and left them to look after the lee household for a couple of hours. "i know how you look at me. how you've always fucking looked at me, jaemin."

"quit messing around!" the other snapped, adrenaline pumping under his skin when faced with this situation. maybe once or twice...or a whole bunch of times, he'd gotten off at the thought of this person...but never once did he think it'd actually become a reality. "this isn't a joke anymore...hyuck. we're not two kids fucking about like we used to be."

"and who said i was 'fucking about?'" the older inched his face closer. "i'm dead serious, jaem. watching you act so innocent at your age is actually annoying me now, and you have the audacity to be a pain in my ass during class...but use no actions to back up your bold games."

is he angry at me, or what? the pinkette breathed heavily, cursing his young body for getting hot over this. he did have one thing over the guy though, and he would've been fucked had he not used it. "all those years i slept early and ate those disgusting vegetables," he gushed, flipping them around and officially towering over his teacher. "they paid off. i may not be as smart as you, or as old as you....but i'm taller, aren't i?" he started sliding off the bed to create some distance. as much as his hormones were screaming at him to let this man ruin him, he didn't want to face each day at school recalling this.

"aaaw, so jaemin's really a big boy now?" donghyuck teased, sitting up properly and looking exceedingly smug. "not the little grain of rice i used to shake off my leg."

"and how is it me who's pushing you away now?" the student swallowed hard, blinking once before rubbing his face and pushing away his desires right now. donghyuck didn't like that confidence though, not when he had been waiting so damn long for the taller to mature. watching him get older had been hard...because he didn't want to lose him one day. he didn't want jaemin to realise that he was fine on his own and didn't need to hold his hand anymore. but the longer he waited, the more obvious it became that his little friend from his early years was harbouring a crush on him.

the pretty teenager was always his all along, and he'd only worked that out a year or two prior.

"na jaemin," he spoke lowly...authoritatively. the younger was slinking towards the door, totally preoccupied with his own thoughts. his lanky physique was really tempting to just grab and drag back in here, to donghyuck, but he also respected boundaries. words were so much more powerful in these cases...

"hyuck, let's just go watch some tv or something," the pinkette whined. "everything's a funny game to you, but it isn't for me."

"i'll put it to you this way, nana," he murmured, resting back on his hands which were pressed against the sheets. "i want you because i like you...not because i'm in the mood. you are a genuine distraction for me, and if you say 'no'," he tilted his head and allowed his blonde fringe to sail over his eyes prettily, "then i can't stick around."

"what do you mean...?"

"i'm saying i've been considering transferring to a different school...because i shouldn't be looking at you in this way. but," his breath faltered when he thought about it, "but i couldn't leave you without giving you the option. you're the student after all...i can't stop thinking about you."

jaemin shivered under his firm gaze, hands subconsciously coming up to hold his upper arms. he looked to the floor and imagined what life would be like without hyuck. it would be horrible, right? he couldn't let that happen...but the amount of trouble they'd be in for conducting an illegal relationship was an even worse fate...wasn't it?

but, like the silly teenager he was...he ran straight into his open arms. jaemin wasn't prepared to think about this wisely or maturely, and he most certainly didn't have the time he needed for that. but age was just a number, or so he'd like to believe, and six years would disappear once both were allowed to be together. he just needed to hide until he graduated.

"don't go," he whispered against the older's ear, inhaling that intoxicatingly addictive smell of his; black cherries and the forest. "i'll be good..." he submitted. melted like chocolate in his teacher's hands.

"c'mere, you big child," donghyuck cooed, noting the desperation in the other's mocha-brown eyes. "i'm not going anywhere, okay? if you don't want me to."

jaemin thankfully flopped in his hold and felt an overwhelming sense of relief flood his body. the older snickered at the new weight and lay him back onto the bed, taking no time at all to claim the boy's lips. it was so simple, as the pinkette wasn't one for arguing when he didn't know best...and in this situation, under his longtime love and teacher...he most certainly didn't know best.

"open your mouth," hyuck instructed, licking along his jaw and reaching his ear to nip at it. the taller did as he was told, parting his lips for ragged breaths to escape - only to have them swallowed and mixed with the blonde's.

the older skilfully dominated his typically chatty mouth, dragging his tongue along the walls of his cheeks and shutting down any form of a fight the younger's hot muscle made. jaemin was a whimpering mess under him, hands tugging at the dyed hair needily.

"fuck," donghyuck elicited shortly, not tearing away from the action for very long as he swiftly unclothed his closest friend. the taller's body reacted to every little thing, and god did it have the tanned male craving every ounce of him. "you are going to be crying when i'm done with you," he smirked deviously.

and he did. jaemin was at his mercy for the remainder of that night....

little did either know how far this would all go...how much their sheer addiction for each other could develop.

"the assignment is due for wednesday," hyuck called as everyone groaned in response and packed their belongings away. "don't sass me, just do the work. last time i received twenty out of twenty six projects, and you can bet your asses that's not good enough."

the pink-haired boy at the back of the room pursed his lips to avoid giggling. he'd done the work, obviously....but it was a few of his friends that hadn't. he wouldn't have risked his own health and safety by crossing 'mr. lee'. ew, he hated calling him that.

"ugh, what a load of bullshit," the male he sat beside tsked, clearing off his table and looking down at jaemin who was still pleasantly sitting there. "you coming?"

"nope. i have to ask about the assignment." yeah right.

"suit yourself," the other scoffed, flicking the teen's forehead playfully before saluting him and exiting the room. the lab was left with two...donghyuck, and jaemin. the teacher was halfheartedly gathering up sheets of paper and shoving them into folders, which then went to his bag. his student, however, just kept eyeing him up.

it had been three months since they'd first broken the 'friend barrier', and now they'd developed a rhythm, if you'd like, a game. "if you keep gazing at me like that," the older chuckled softly, "you might have trouble coming, nana."

"good thing i enjoy trouble..."

and like always, the pinkette was spread out on his desk for his teacher merely five minutes later, getting absolutely railed amidst the darkness of the room. a room only mr. lee had the keys to.

"ugh, nana," the blonde hissed out as he harshly slammed in and out of the boy, "how are you always so fucking tight?"

"ah-i," he cried out, biting on his wrist to muffle to the loud pleasure he was experiencing, "i-i don't ngh know..."

"shit, i love you so goddamn much, baby. you're everything," he gushed, holding the taller's legs apart and spreading them as far as possible. he always managed to hit every good place within his partner's body, and jaemin lived for it. their voices had to be low due to their setting, but it didn't stop the younger from moaning out every time donghyuck would brush against his sensitive nerves teasingly.

"agh! hyuck, it's th-there...please..." he begged. he knew the older was simply fishing for these words, and that he knew damn well where jaemin's prostate was....he didn't mind feeding his desires, though.

"love, i'm gonna cum," the blonde warned, sliding out of the boy's tight hole and dragging him down along the desk to rest on his knees upon the floor. "hide the evidence, will you?"

"mhm," he hummed obediently, taking the older's hard member into his hand and flicking his wrist a few times while running his tongue over his lips. then, once he felt he was ready, he licked along the tip three painfully slow times before giggling and sliding the whole thing into his mouth.

"ngh, too bwig-" he tried to speak while sucking him off, so hyuck guided his now vacant hand towards the base and urged him to use that instead of attempting to suffocate himself. jaemin breathed in and out slowly through his nose, the wet noises of his tongue running along the shaft and his lips dragging along it mixed with his frequent moaning.

donghyuck was in a state of pure bliss, head tilted back and fingers now firmly entwined with the younger's fluffy, pink hair. the student had a sensitive scalp, and adored the gentle tugs to his locks here and there when he was being told he was doing a good job.

his free hand that wasn't jerking him off moved to the problem between his own legs, desperately urging himself towards the release he desired as well. donghyuck's breath suddenly hitched and he forcefully shoved himself all the way into the other's mouth, reaching the back of his throat and letting go of the knot that had formed in the pit of his stomach. "ugh, nana. you're so..." he whined, loving the sensation of the teen's throat constricting around him.

pools of white liquid flooded jaemin's mouth, and he did his best to swallow everything so that they'd never be caught. his own orgasm was fast approaching, but donghyuck wasn't mean enough to let him get there alone.

"up here, baby," he tapped the desk, getting him to sit up and spread his legs once more. "show me."

then, kneeling down before the other's exposed entrance, he gently pressed three fingers into the tight space quite easily since he'd just been fucking it mercilessly minutes ago, and it was a bit wet from precum. there was no time spared before he roughly started dragging them in and out, drawing gorgeous pants and profanities from his secret lover's lips.

"hyuck! hyuck, oh my god, right there!" the pinkette insisted, proceeding to meet the other's thrusts by moving his hips onto his fingers. the blonde smiled cunningly and bent the tips a little to scratch those pink walls and have the younger screaming in utter need and pleasure. "please. i'm s-so close!"

"you're ready, huh?" he teased, sliding his mouth onto his dick to catch the free-flow much like jaemin had down for him. it only took about three hard drags of his tongue along the taller's length to feel his release shoot surprisingly to the back of his throat and slide down without warning. he coughed and gagged, pulling back and breathing heavily to regain some composure.

"mhm, baby you have to tell me when you're cumming," he choked out, wiping his mouth with the back of his hand.

"sorry," jaemin panted, a weak mess on the tabletop with his limbs sprawled out and his chest rising and lowering sporadically. "i-i couldn't hold it...."

"it's okay," donghyuck started to chuckle a little and got up just to stumble forward and grasp the sides of the desk his lover was on. "we should get cleaned up."

"uuugghhh, i don't want to!"

"psh, brat."

"your brat," the pinkette winked cutely, attempting to lift his hand up to cup the blonde's cheek, though losing energy halfway and having him lean in to meet him there. "i love you."

"i love you too, you silly idiot. now let's get going, hm? mum and dad want to hear all about your career plans when we have dinner tonight."

great.

word count: [3229]

my nahyuck heart wanted to try top donghyuck, and this was the outcome. i hope it was okay, 'cause i was actually planning more but i felt it was already long enough. i hope my smut skills are improving somewhat.

thanks for reading,
-lily