Fic: be careful what you wish for

Koo thought he was all alone. Koo thought he could get away with it. Oh, no, little boy. Jin *always* knows.

Jin/Koo | power dynamics | dom!Jin / sub!Koo | sex toy | overstimulation | edging | multiple orgasm | references to JinxMaknae line
Jin leans on the door frame, watching as Jungkook flicks to another tab, opens a new video. It’s a favourite of his (all soft and sensual, romantic and tender) - Koo is so *very* predictable, sometimes, and Jin’s seen that video in Koo’s history often enough to know.
Such a naughty little boy, he thinks to himself, as he watches Jungkook settle in, a sigh coming out as the video starts to play. His silver earrings flash in the light from the screen, and the music starts.

Jin waits.
No point in interrupting him yet - after all, now he hasn’t technically broken the rules.
Jin’s a big believer in letting little boys make their own trouble. It’s half the fun, he knows, and Koo is so rarely naughty that this… this is all the more exciting. He breathes in, holding his breath, hoping that Koo won’t notice him. Of course he won’t.
He’s too interested in the screen, at what he can see, and Jin smirks.

It’s only when Jin sees a hand dipping out of sight, below his waistband that he decides to step in.

“Hyung is disappointed in you,” he says, as he steps forward, flicking the light on.
Jungkook jolts, his whole body freezing in place - his gut instinct is *freeze* and Jin can’t help but feel a little bit like the predator finding the prey. Sometimes, Jungkook really does live up to his reputation as a certain little frightened animal.
And oh, how Jin wants to eat him all up. Devour him whole because he’s just so… delicious. He can almost hear Jungkook’s heart pounding as he closes the door, and walks up behind him. Even though he can’t see his face, it’s already such fun.
He walks carefully, slowly, each step precise and Jungkook doesn’t move. It’s an odd position to find him in. Sprawled out on the floor, a cushion at his back, every inch of free space taken up by long legs and a tiny little waist,
but Jungkook’s no stranger to using the floor as a second home.

In the silence, Jin settles on the edge of the bed, looks down at Jungkook.

He loosens his tie.

“Have you nothing to say for yourself, little one?”
“I -” Jungkook is mortified. His hand inside his jeans, caught in the act, he’s every inch the naughty little boy that Jin knows he can be. He glances around - seeking an exit that doesn’t exist.

“Yes, Koo. You.” Jin tuts as he adjusts the sleeves of his shirt.
He just came from a night out with his family, all smart jacket, a shirt, and tie. He didn’t even have time to take his shoes off. So very different from Jungkook’s t-shirt, jeans, bare feet.

“But - you’re not - you’re supposed to be out until eleven?”
“It is eleven, little boy.” Jin didn’t lie. Koo just lost track of time, as he tends to do.

“Oh.”

“And what do I find when I come back, but you, breaking the rules.” Jin tuts, crosses one leg over the other.
Koo still hasn’t moved, one hand still tucked in his jeans, and Jin can’t have that.

“But -”

“Hyung is disappointed in you.”

“I’m -”

“You know the rules, Koo. You can’t be trusted on your own to do something so big.” Jin shakes his head.
“I’ve taught you better than this, haven’t I?”

“The door - it was - closed - wasn’t it?”

“Was it?” Jin knows the answer to that question and he’s not telling. But Jungkook doesn’t. “I think you wanted me to find you like this. Such a little boy needs help, doesn’t he?”
“I’m - I’m not -”

“You’re just too small to do this, all by yourself.” He taps a finger on his lips, watches as Jungkook *squirms* under his gaze, all hot cheeks and bitten lips. He knows he’s been caught, fair and square, and Jin has taught him ever so well.
And usually he’s a good boy, too, eager to please, sticks to his rules like glue. It’s Jimin who’s the rule breaker, the one with wandering hands, who needs a chastity belt and who needs reminding constantly that his little parts don’t belong to him.
They belong to someone who knows how to take care of him, instead.

But not tonight. Tonight, it’s Koo’s turn to break one of the most important rules. It’s Jin’s job then to *correct* his little boy, isn’t it? Put him back on the right course.

Teach him who he belongs to.
Jungkook stares up at Jin. He didn’t - he didn’t expect to get caught. He’s usually good, usually remembers his rules but tonight, tonight he just… he wanted to have some alone time, with his favourite videos, slow and lazy. Jin… Jin was supposed to be out.
“And you decided to take advantage of that?” Jin’s gaze is piercing, and Jungkook squirms. He tries to take his hand out of his jeans, only belatedly aware that it was in there, touching what isn’t his, but Jin tuts at him again. .
Underneath his finger tips, his dick is just beginning to harden again, and he knows it hasn’t escaped Jin’s notice.

“I - you weren’t - supposed - to know?” It’s more a question than an answer and Jin smirks.
“It’s my room, little boy. You came into *my* room, lay down on *my* floor, and decided to touch what we agreed belonged to *me*.” At the time, it felt like a good idea. Now, Jungkook realises how badly he’s miscalculated.
“I’m sorry -” he can’t help reaching down, brushing against his dick under his jeans and Jin shakes his head at him. He takes his hand out as fast as he can, but that’s the wrong move.

“No, no, Koo. If you’re so determined to touch, I won’t stop you.”
Jungkook swallows. Jin never gives a gift like that without a consequence. Usually, it’s Jimin or Taehyung on the receiving end of it, but… but this time, it’s just him.

“Stand up for me, little boy.”
He scrambles to his feet, as Jin leans over to the bedside drawer.

“Strip.”

His hands tremble as he peels off his t-shirt, pushes his jeans down. It feels - odd, seeing Jin sat there, in his navy suit, a red tie, looking immaculate, as always and he’s naked.
He's all bare and exposed on the hardwood floor. His clothes lay abandoned around him.

“Fold them neatly, Koo.” Jin scolds him for the mess. “Don’t be a slovenly boy. You know better than that.”

He does. He does know better. Jin likes everything neat and tidy.
Jungkook feels the burning heat of Jin’s gaze all over him as he folds the clothes, and then refolds them when Jin doesn’t think they’re tidy enough.

His hands tremble.

“What -”

“Hmm?” Jin is still rummaging in the drawer. “Does my naughty little boy have something to say?”
“I’m sorry.” He says.

“Oh, you will be.” Jin smiles at him, and Jungkook feels the heat begin to rise in his belly. “Little boys who are naughty always end up feeling sorry for themselves, don’t they?”
Jungkook’s nodding before he can think twice, and Jin withdraws his hand from the drawer, his prize found. Upon seeing it, suddenly, Jungkook remembers that Jin doesn’t make empty promises, and he always follows through on anything he says.

He’s in *big* trouble now.
Fifteen minutes later, and Koo is in hell.

Jungkook’s hips stutter, his orgasm ripped away from him at the last moment, and he whines, smothering his face with his hands, as Jin lifts the vibrating wand away from his dick. He's too good at this.
He’s been too good at this for a long time - he can read Jungkook’s body like a book, knows when he’s close without ever needing a word out of him.

It is maddening.

Jungkook feels the tears begin to start, unable to stop them. He whines, tries to get Jin to put the wand back.
The words just fall out of his mouth: *he’s so close, please, please hyung, please*, and he promises Jin the earth and the moon, to.

All he gets… is a soft laugh.

“No, no, Koo. We’re doing this my way now.”
Jungkook feels his thighs tremble, and he moans. He knows Jin saw his dick twitch, knows that he did, and it’s so frustrating. He almost reaches down, to do it himself.

But Jin’s looking at him with dark eyes, and he knows if he does that, he won’t like the consequences.
“Good boy. Making good choices at last. Hyung likes it when you’re being good.”

Something in his belly flips at that, and he squirms, feels his cheeks get hot under his hands. He’s being Jin’s good boy again, even if this is punishment. The wand comes back, again, finally.
Jin is a master at wielding it. Light touches, just enough to feel it but not enough to drown in it, tracing up around the head of his dick, the buzz almost but not quite enough.

He thrashes his head from side to side, tries to follow it with his hips. Jin lifts the wand away.
“Put them down on the floor.”

“Please!” He’s begging, he’s not ashamed to admit it now.
“Put your hips down, Koo.” Jin holds the wand in one hand, the soft baby pink deceptively innocent. But it’s a devil of the fucking devil and Jungkook suddenly understands why Jimin and Tae complain about it - loudly, and with tears, and helpless tosses of their heads.
God, it’s evil.

It’s too much, not enough, intense and faint all at once, in the best and worst ways, and he feels himself almost growling as he tries to chase it with his hips, but Jin smacks the inside of his thigh.
The sting of it isn’t enough to make his dick soft - on the contrary, it’s only adding to the rising heat in his belly.

“Don’t be naughty, little boy,” Jin slaps the other one, making a matching pair and the jolt in Koo’s belly is answer enough for him.
“Desperation is as desperation does, but you know better.”

“I -”

“You’ll get to come soon enough.” Somehow in the back of his head, part of Jungkook recognises the look in Jin’s eyes, files it under not a good thing, but he’s too desperate, too eager to pay attention to it.
“And we’ll begin again…” The wand comes down again, and Jungkook wails.
The second orgasm is harder. It’s meant to be - if he wanted to make this easy on Koo, he could have done. The first one was all about that initial neediness, the clumsy lust that Koo had being taken care of but now, Jin is creating *art*.
This time, Jin puts him on his hands and knees, thighs spread wide, everything on show and available to the discerning eye. He can see himself in the mirror every time he opens his eyes, and it - he looks wrecked.

It’s exactly what Jin had planned for him.
Sweat beads on his forehead, and Jin feels it in his hair when he pulls Koo’s head back, looks into his face. His cheeks are pink, his mouth is wide and red, and every inch of him is naked, exposed to the air, to the light, to Jin’s knowing gaze.
“You look like such a bad little boy, don’t you?” Jungkook has lost his words but he tries to turn away. Jin holds his chin. “Mmm, I think you are. My bad little boy, all needy and desperate for hyung to take care of him, unable to keep still.”
He pulls Koo’s head back even more, exposes his throat, and contrary to Jin’s words, Koo doesn’t fight him. He goes, pliant to the end, and Jin watches the pulse in his neck thrum with life.

He’s very responsive tonight and Jin smiles down at him.
“It’s okay, Jungkookie.” He leans down, wraps his other hand around a slender column of throat, tightens it just a fraction. “Hyung’s here. You’ve got all my attention now.”
The moan he gets back says it all. He almost feels it more than he hears it, and Jin is so hard already. He toys with the idea of taking his dick out, jacking over Koo’s pretty face but he’s not at that point yet. Privilege of not being Jungkook - Jin has control over himself.
Instead, he drops Jungkook’s hair, gives him a moment of reprieve against the torrent of feelings and sensations and memories that Jin has just invoked. As Jungkook ruts against the air, his dick angry, hard, and leaking precome on the floor, Jin tuts at him again.
“Are you being messy?”

There’s a little pool of fluid, shiny and clear on the wooden floor and he slaps Jungkook’s ass as punishment. It leaves a dull red mark, blooming on thick curves, and he does it again, and again. Jungkook moans again, moving back into the blows.
“You’ll have to clean that up, when we’re done.” Jin’s kind. He won’t make Koo try to focus his attention on it now. His little one has a limited attention span, and right now, Jin is testing it to its limits by making him drown in both sensation and words.
He moves back to where he was before, between Jungkook’s golden thighs. In the mirror, he watches Koo follow him as he pants, rutting into the air, more precome slowly oozing from the tip of his dick.

Messy messy boy tonight, Jin thinks, and he gives Koo another slap for it.
When Jin turns on the wand again, he sees Jungkook jolt forward, instinct telling him to go but he was prepared, following him with it.

“Ah, ah,” he says. “No running away, little one. This is a consequence, isn’t it?”
“Y-ye-s hyung!” Jungkook is near sobbing but he still manages that at least.

He sounds so pretty when he cries, but then again, Koo is pretty all over. Jin loves that.
He can’t take his eyes off Jungkook’s dick, red and hot in his hand, thicker than either Jimin or Tae’s and just as lovely as both of theirs. It contrasts with the pale hand holding it so delicately, the pink wand looking so charming next to it.
If he could paint, he’d paint this forever.

Jin is perfectly put together, his suit jacket laying on the bed, shirt sleeves rolled to his elbows, but every part of him is immaculate. Even his tie isn’t even the slightest bit askew.
Jungkook’s always been his visual one, drinking it all with big doe eyes, and today is no different. He stares at Jin through the curls in front of his eyes, his elbows locked as he tries to stay upright.
He trembles with the exertion. Jin loves that putting him in front of a mirror is all it takes to rile him up once more.

“That’s it, Koo,” Jin says, as he presses the wand to the head of Jungkook’s dick. “Come again for me.”
Twice in quick succession isn’t as difficult for him as it used to be (and frankly, it was never that difficult in the first place), and he comes again, white spurting into Jin’s hand, hips rocking down, thrusting into the closed fist that JIn so generously offers him.
It’s the third time that’s the hard one.

Jungkook is a sensitive boy, at the best of times, and at this point, Jin’s pushing him into sensory overload. Well, not so much pushing, he thinks, as he kneels between Koo’s spread thighs.
He’s on his back on the floor, having collapsed onto his side after the second. He’s more guiding Koo closer and closer to the edge, by hook or by crook, and reaping the rewards for his troubles.

Not that this is a trouble.
On the contrary, Jin finds himself in his element as Koo cries out. Only, Jin’s not quite ready for him to come again, and he lifts the wand away, watches as Koo’s hips thrust upwards, his thighs trembling as he tries to come but it’s just not enough.
The noise that comes out of his mouth is nothing short of a tortured moan and Jin can’t help smiling at it. Oh, he loves this.

He swings the wand to and fro, listens to the relentless buzz of it.
“What’s the matter, Koo?” He says, as he stands up, paces slowly around the prone little boy on his bedroom floor. “I thought you wanted to play?”

Jungkook huffs, panting, and Jin can read the frustration carved into every curve of his body, every line of long legs,
thick thighs, arms that can bench press almost as much as Jin can.

Almost.

He’s still Jin’s littlest one, and that’s how it’s going to be.

“Don’t you want to play? After all, you came into *my* room, when I wasn’t here, to watch your naughty videos, didn’t you?”
“I - yes - *please!*”

He curls onto his side, but Jin won’t let that. Oh, no, no hiding from him. A black leather brogue on his thigh, pushes him over onto his back again, spread wide, and Jin will never get over the sound that Koo makes again.
He rarely plays like with his littlest one, but maybe he should. The vision before him is inspired.
It’s a curious return to where he was when Jin found him, but this time, he’s not calm, composed, and preparing to be naughty.

Jin’s ruined him.

He’s barely holding to himself, barely holding onto his sense of sanity, hands tangled in his own hair.
He whines, moans, breathy sighs as Jin leans down, presses the head of the wand to a dark brown nipple. Jungkook cries out - more, please! - and Jin is kind.

So kind.

He pinches the other, and he’ll never get tired of Koo’s whimper, his noise of pleasure come pain.
He’s such a little precious pet about his nipples, all protective of them. It’s not hard to know why; they’re hardwired to his dick, and Jin knows it.

And he’s using it now.
It’s still just not quite enough, not enough to get him off, and Jin knocks aside the hand that sneaks down, trying to take hold of the precious jewels that don’t belong to Jungkook.
“Ah, ah, you know better.” Koo moans again at that, desperation making it raw and rough. “Who do these belong to?”

“What -”

“Who owns these little parts?” He taps the head of Koo’s dick with the vibrator, just once, and the hiss he gets in response tells him so much.
“Use your words, Koo.”

“Y-You…”

“Who?”

“Jin-hyung!” He’s trained that answer into all of his little ones, and it sounds so pretty coming out of Koo’s mouth. Jin kisses his fingers, presses them to Koo’s cheek.
He’s not going to kiss him yet - he has to earn that back, but it’s a little reassurance that Koo needs right now. “And what’s the rule about these little parts?”

“I - they - they’re yours, not mine!”

“And who can touch them?”

“You!”

“And?”

“I - no - what -”
That’s thrown Jungkook, confused the hell out of him, and Jin sighs, shakes his head at the confusion he sees on his face.

“Is there anybody who can touch them?”

“No! Only hyung!” That’s what he wanted. What he was looking for. “Only - only for you!”
Jin kneels again between those thighs. He presses the wand behind Koo’s balls, reveling in the jolt it gets him in return.

“Look at me.”

“Can’t -” Koo’s lost, adrift on a sea of pleasure edged with pain, the kind that feels good.
Jin’s pushed him further before but three with a wand is work for him, and he knows that Koo doesn’t know what to do with himself.

“Look at me.”
Dark eyes look at him, tears glistening like diamonds before they fall. His lips are parted, bitten and cherry red, a bright tongue slipping out to wet them.
https://twitter.com/caramelgrind/status/1283865983304765441
He holds Koo’s dick, tenderly, as the precious little thing deserves. He knows that three isn’t the furthest he’s ever pushed Jungkook, but usually, it takes more prep, more planning than this. His little boy didn’t give Jin a chance to work him up to it.
It’s hard enough to work him up to three today. Jungkook is panting, whining, and he is completely incapable. The puddle of slick precome underneath him is growing by the second.
He always said Koo could fill a pool with it, and he toys with plush balls, loves the moan he gets back in return.

“Are you listening to me?” He presses the head of the wand into Koo’s perineum, feels more than hears the half shout.
It’s too much for him, too many sensations, and Jin isn’t slowing down. “I asked you a question, little boy?”

“Y-Yes, hyung!” Koo claws at the floor, hair all over his face. He’s half trying to escape, half chasing the wand for more of the same.
It’s so funny to see that neither side is winning.

“Are you going to come for me?”

“Please!” Jungkook moans, over and over, a prayer to Jin to grant him the relief he’s *sure* he’s earned. “Pleasepleasepleasepleasepleaseplease!”

“Hyung is so good to you, hmm?”
He just touches it - so lightly - to the tip of Koo’s dick, watches the angry twitch he gets in response. “Isn’t hyung kind to his little boy?”

“So good, so kind -” H e’s not even listening anymore, just repeating words that he knows.

Jin takes pity on him.
He loves wrecking Koo but his little boy is too little to keep playing with him like that forever.

He’s not Jimin or Tae.

He discards the wand - Jin will do this with his hands, thank you very much. He’s a purist when it comes down to it.
And the wand was fun but nothing beats the real thing. Jin’s in the mood to be connected to his little boy.

“There’s my good boy,” he says, as he strokes firmly down the length in his hands. “Come for me, Koo. Hyung’s here, here for you.”

“Please!”

“You can come.”
He’s granting permission again and again but Jungkook needs to hear it.

He comes, not quite dry but significantly less than before, shuddering, gasping, maybe even drooling on Jin’s floor, the tension in his body expelled in seconds as he helplessly thrusts into Jin’s hands.
Jin’s not completely done with him - he milks him long and slow, pressing his thumbs into Jungkook’s perieum again, making sure he’s pressing on his prostate from the outside and the gasp and the frantic toss of the head tells him that Koo is almost too far.
It’s only when Koo collapses in on himself, curling his legs up, that Jin stops. He kneels in front of his messy little boy, all sweaty, lying in his own precome pool, shuddering. It’s so endearing.
He presses his hand into the handprint on the side of Jungkook’s thigh, loving how it shows up brighter than before.

“Have you learned your lesson, little boy?” He asks, stroking over the red skin.
Jungkook nods, his eyes squeezed tight shut, dark lashes wet with tears, his cheeks red and flushed, his chest heaving.

Jin thinks this lesson will stick for a while. Koo isn’t one to forget his rules, to push boundaries, but every so often, he goes looking for trouble.
And Jin will always be there to teach him those lessons. remind him to be a good boy, to remember his rules.

After all, Jungkook’s just his little boy, all helpless and forgetful, silly and pretty. Where would he be without Jin?
END OF THREAD!

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