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shadowkoo · 2 months ago

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Oh Brother

→ Summary: Things are bound to get messy when you fuck your brother’s best friend repeatedly. Better not get caught, for both of your sakes.

↠ jungkook x f.reader | 1.8k words | 18+ ↠ genre: smut, brother’s best friend, college au, pwp

→ Warnings: explicit and unprotected sex, dirty bathroom quickie, flashbacks to hooking up the night before, koo fucks you hard from behind, riding on his fingers, sloppy handjob, i think that’s it but let me know if i missed any!!

→ Author Note: soooooo part 2 coming soon 👀 what do we think?

“You didn’t say Jungkook was coming,” you say nervously after noticing him with the rest of your friend group at the bar. Fuck.

Your brother gives you a weird look, “Since when is that an issue? You’ve always gotten along with ‘Kook.”

You attempt to relax your shoulders and do your best to look as innocent as possible.

“Did something happen? Did he do something to you?” Jaemin quizzes you, failing to hide his ‘concerned brother’ act.

“No…Of course not!” Phantom kisses on your neck remind you that your statement couldn’t be farther from the truth. Jungkook did more than something to you last night, the faint bruises on your inner thighs and the soreness you feel today prove just how much he did…

Unsurprisingly, Jungkook immediately notices that his best friend has arrived with his ‘off-limits’ sister. Though you weren’t so off-limits last night…

Holding your stare, his lip curls up just the slightest into a very familiar smirk, one that he knows happens to drive you crazy.

“Hey man, we missed you last night,” Jaemin says, going in for the typical half-hug all guys do for whatever reason.

“Bro, no you didn’t,” Jungkook jokes, “You might’ve had an actual chance with the ladies since I took off so soon.”

“Fuck you,” Jaemin laughs, “I’m gonna grab a drink, you guys want anything?”

Jungkook lifts the beer bottle in his hand, “I’m good.”

“Same here, I’ll grab one when I’m, uh… ready.” Jungkook hasn’t stopped looking at you yet, causing you to stumble over your words.

Jaemin squints at the two of you, “You’re both acting so weird today.”

Jungkook tenses beside you, his body going stiff for just a moment, but his expression remains unreadable, refusing to spill any of the secrets swirling beneath the surface. It's as if he's mastered the art of control, locking away whatever turmoil or guilt threatens to slip through. Yet, the subtle clench of his jaw and the tightness in his posture tell you there’s more simmering just beneath his calm exterior.

“Kinda feels like an off-day,” he says, trying to play it cool. “Remind me to stick the next party out, will you?”

Jaemin’s normal smile returns. “Yeah because we both know how well you listen to me. I’ll be back in a bit. Relax, have some fun,” he says to you, knowing that you’ll try to find an empty corner to claim as your own sooner rather than later.

“So what then,” Jungkook starts when your brother is just out of earshot, “Are we going to pretend that last night never happened?”

“Wouldn’t that be the smart thing to do?”

“No.”

“No?” You’re surprised at his answer.

He pulls you aside, out of the eye of everyone you know, and kisses you hard. “Are you sure that’s what you want?” You don’t answer so he kisses you again, this time his tongue lingers on yours.

“Is that what you want?” he says after pulling back.

“No,” you breathe.

“Then tell me,” he urges, pushing you up against the wall, “What is it that you want, Y/N?”

You’re the one that pulls him in for another gut-twisting kiss this time. But it’s short-lived.

“What do you want,” he urges again, his hands gripping your sides causing your insides to melt all over.

“I want this,” you whine, running your hand over the front of his jeans, feeling his length pressing hard against the ungiving material, “I want you.”

“I could get used to hearing that,” he growls in your ear as he pulls you towards the bathroom that’s just around the corner.

His words trigger an instant flashback to last night, pulling you back to the moments that still cling to your mind. The thick tension, the rushing adrenaline, the way everything had unraveled so quickly—it all comes rushing back.

Jungkook’s rough fingers tease your opening, gliding across your warmth with ease.

“Mmm. I could get used to this,” he smirks, enjoying the pleasure painted on your face as you lay sprawled out on your bed.

He hasn’t got a clue how he ended up this lucky. Just a few minutes ago he was hiding from a one-night-stand gone wrong, and now here he is, doing the unimaginable with his best friend’s little sister.

Though you aren’t so ‘little’ anymore, college has made sure of that.

Gone are the awkward haircuts, the childish features, and the gangly limbs that once defined you. In their place stands someone entirely transformed—sharp cheekbones, full lips (that are gorgeously parted right now), and an air of quiet confidence that wasn’t there before.

Your eyes, once wide with innocence, now hold a depth and intensity that speak of naughty experiences; experiences that now define a certain sparkle he discovers once he curls his fingers inside of you.

“Well don’t. This isn’t going to end well. You and I both know it,” you pant as his lips trail lower and lower along your bare chest until he’s hovering above your hardening nipples.

This is such a bad idea…

“Does that matter?” He questions, his hot breath tickling your skin.

“Shouldn’t it?” You lean up on your elbows to look at him.

He pulls back to return your gaze, “It’s not like anyone has to know. Are you going to tell?” His voice is low, almost a whisper, daring you to break the silence hanging between you. The weight of his question lingers in the air, thick with the unspoken consequences.

You shake your head, but it feels like more than just an answer—it’s a surrender. No, you’re not going to tell. You can’t. The secret is now yours to keep forever, whatever happens tonight is just between the two of you.

“Exactly, so can we continue?”

This time, you nod, a hint of mischief curling at the edges of your lips. What’s the harm in indulging in a little secret fun? The thrill of keeping something just for yourselves sends a rush through you, making the moment feel even more electrifying.

There’s a rebellious allure in the secrecy, a temptation in knowing no one else has to find out. Your pulse quickens at the thought, excitement mingling with the danger of being caught, but you push that aside.

Right now, it feels too good to care.

He gently lifts a hand to cup your cheek, his touch warm and tender. His lips brush against yours in a soft, fleeting kiss that lingers just long enough to stir something inside you. But then it deepens, growing more intense, his hand sliding to the back of your neck as the kiss intensifies. The fluttering in your stomach turns into a full rush of adrenaline, making your pulse race as you lean into him, lost in the moment.

“Wait,” you say in between his kisses, “Won’t they miss you down at the party?”

Jungkook chuckles as he pulls back once again, “They think I left to avoid Raina. And yes, before you ask, I’ll sneak out after. Now do you want to keep going, or should I leave now?”

“Don’t you dare leave,” you say, pulling him into another quick kiss, “I want this. I want you.”

Jungkook works his way back down your body, leaving warm kisses on your breasts, down your stomach, only to stop just above the waistband of your panties. His fingers slide underneath the fabric and linger where they once were. He looks up at you for permission to touch you again, which you quickly grant in need of feeling him feeling you.

You reach for him as his fingers dip into you, stretching you for what is to come. Jungkook hisses as your cold hand slips into his boxers, tugging on his half-hard length. Your lips move to his neck when he adds another finger inside of you, your head feeling fuzzy from the growing knot in your stomach. His mouth presses hard against yours as he flips you over so you’re on top of his hips. The perfect position for you to grind into his quickening fingers.

“Take this off,” he whispers, pulling at the back of your bra until it unhooks. Once rid of the lacy piece, he moves to your panties. Stripping off your final layers of clothing, you bare yourselves before climbing back into each other’s arms.

Jungkook’s kisses turn lazy as your body moves along on his girth, his breath catching in the back of his throat at how wonderful your wet center feels against his hardening length. Perching above him, you align yourselves before lowering slowly onto him.

The deep groan that leaves his lips could have been enough to send you over the edge just then. Especially as his arms encircle around your back while you bounce on him, throwing your head back at how good this feels, despite how bad it is that you’re fucking your brother’s best friend.

None of that matters right now.

Jungkook flips you over and lifts your ass in the air so he can take you from behind. You have zero complaints. Clenching around his thick, throbbing member, your inner walls pulsate with each deep thrust.

“Oh my god, Jungkook,” you pant, “Right there, please. Right there!”

His member stretches your insides as he continues to pound into you from behind, filling you in the best way possible, expanding parts of you that you didn’t know could. His thrusts meet you with perfect precision and accuracy, bringing you so close to that edge again.

One of his hands wraps around your front, and the small circles he rubs in between your legs are exactly what you need. The coil snaps, sending you over the edge and into a spiral of hot pleasure, Jungkook following right behind you.

You lay there catching your breath while listening to each other’s beating hearts, ignoring the sounds of the party lingering on outside your bedroom door as you drift into a well-needed sleep. Tomorrow you can deal with the whole brother’s best friend thing.

The recent memory fades as you’re brought back to the present where Jungkook has you in a small, and probably hazardous, dingy bar bathroom. His lips replace the phantom kisses you felt earlier as he lifts you onto the sink counter.

“Hurry,” you whine while quickly undoing his jeans, silently praying that none of your friends notice the sudden absence of you and him. Hoping the shadows and noise of the crowd will keep your escape unnoticed. The last thing you need is for anyone to start asking questions, or worse, to catch on to what’s happening.

You prepare yourself for the good time you know is coming, and grip the sink tightly so you don’t crash into the mirror behind you from his powerful thrusts.

The bathroom door opens suddenly, and a pissed-off-looking Jaemin is standing there. His eyes drift to you sitting on the bathroom sink with your dress hiked up, then to Jungkook, standing in between your open, exposed legs, with his jeans loosened around his waist.

Jaemin’s face flushes crimson, the fury unmistakable as his eyes lock onto the scene unfolding before him. His fists clench at his sides, every muscle in his body tensing with barely contained rage.

Across from him, Jungkook lets out a nervous laugh, the tension crackling in the air around them.

“Oh brother….”