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cinnasite · 1 month ago

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the science of sleeping with your best friend

꩜ pairing: timeskip!kenma kozume x virgin!female reader

꩜ warnings: explicit content, language

꩜ word count: 4.3k

꩜ synopsis: you relationship with kenma has always been understated—quiet moments, mutual understanding, and an unspoken connection. but when you open up about your insecurities regarding intimacy, things take a turn. one kiss, a subtle shift in dynamics, and suddenly everything you once knew feels entirely different. caught in a whirlwind of desire and growing affection, you find yourself grappling with feelings that you've ignored for years. is it too late to turn back or is this the beginning of something far deeper?

You vividly remember the day you moved to Japan. You were eleven, your nervousness amplified by the way the airport had smelled—metallic, unfamiliar, cold. Your mother stayed back in your hometown with your younger brother, and you followed your father across the ocean for his new job… your new life. You told yourself it was an adventure, trembling in anticipation.

It wasn’t. Not at first.

Making friends when you didn’t speak the language fluently and stood out in every classroom turned out to be less like an odyssey and more of a series of long, silent lunch breaks. Teachers tried, some classmates smiled, but nothing stuck. Not until high school.

Transferring to Nekoma High at fifteen was your father’s idea. He’d said something about the school’s progressive curriculum and cultural diversity. You hadn’t hoped for much until, one week into classes, the principal cornered you near the shoe lockers and asked if you’d consider being the manager for the boys’ volleyball team.

“It’s part of a new initiative. We’re looking to build an inclusive sports environment,” he said. “And you have excellent organisational skills from your transcript.” You said yes, mostly out of curiosity. And maybe because it was the first time someone had sought you out, instead of the other way around.

The first practice was awkward, to put it lightly. A room full of sweaty teenage guys and sharp whistles. You stood off to the side, notebook in hand, questioning every life choice that led you there with a resigned sigh. Until Kuroo Tetsurō slung an arm around your shoulders and said, “Don’t worry, you’re one of us now. You’ll get used to these knuckleheads.”

The team protested. You laughed for the first time in weeks. That’s how it all began.

They took you under their wing like a little sister, especially Kuroo—he treated you with a big-brother protectiveness that made the transition less lonely. Lev would tell you outrageous lies just to see you smile. Yamamoto always tried too hard to impress you but meant well. Yaku taught you how to be blunt in Japanese without accidentally insulting someone’s grandmother.

But the one you inexplicably gravitated toward was Kenma.

You were the same age, and the same reserved type, at least at first glance. Though unlike him, you didn’t mind talking. People were drawn to you in a way that surprised you. So, Kenma didn’t intimidate you. If anything, you felt safe around him. He was calm, observant, and never asked for more than you were willing to give.

You’d sit beside him during breaks, leaning over his shoulder as he played on his handheld console.

“You’re always watching,” he’d say without looking up.

“I like watching,” you’d plainly reply.

And when he let you try it out yourself—tentatively handing over his console like it was something fragile—you knew you had earned his trust. You’d talk about things beyond video games. Books. Movies. Your homesickness. His dislike of crowds. The weird comfort of silence. He was the only one who didn’t flinch when you talked about the divorce or missing your mom and brother.

By the end of your second year, you were inseparable. Everyone saw it—hell, even Kuroo made a habit of teasing you about it.

“She’s the Kenma whisperer,” he’d joke. “He actually talks around her.”

You dismissed it. You told yourself it was just friendship, that the small twists in your stomach when his shoulder brushed yours were normal. That the deliberate and soft way he looked at you was just how he looked at everyone.

But somewhere near the end of school, when the weight of the future started crawling into every conversation, you realised you felt something more. And it scared the hell out of you. You didn’t say anything. How could you risk losing what you had when it had taken you so long to find it?

After graduation, the team drifted as people often do. University took everyone in different directions, but you all stayed in touch. Kuroo’s group chats were relentless and reunions became an annual thing, something precious to look forward to.

With Kenma, your bond never faded. If anything, it grew.

Even when you were in different cities, the two of you never changed—late night phone calls, half-asleep messages, and meeting up whenever you could. Both of you still talked like no time had passed. Still knew each other in that rare, bone-deep way. However, you dated around, courtesy of your college roommate urging you to move on and get laid. You had simply nodded, telling yourself the crush was a remnant of adolescence. It had to be. It wasn’t healthy to keep holding on.

Tragically, it never went anywhere with the people you went out with. No one matched the way Kenma understood you without trying. No one matched the genuinity and the slow-burn thrill.

And now, in your twenties, with a stable job and a quiet apartment, you were beginning to admit that maybe it had never been just a crush.

But if that was true… what in the world were you supposed to do about it?

Kenma’s penthouse was everything you’d expect: clean lines, muted colors, and minimalist furniture. Expensive in a subtle way.

He was already curled up on the low couch when you stepped in, barefoot and hoodie-clad, legs tucked under himself like a cat. “You’re late,” he murmured without looking up from his nintendo.

“You’re lucky I even showed up,” you replied, dropping your bag by the door.

“Oh?” His eyes flicked up momentarily, amused. “Is this you playing hard to get?”

You rolled your eyes and sank into the seat beside him, close enough for your knees to brush. “If I was playing hard to get, you wouldn’t stand a chance.”

That earned a low hum of laughter. “So self-assured.”

The night unfolded the way it generally did—casual banter, leftover takeout, and dumb inside jokes that had survived since Nekoma. You both sat there, bodies angled toward each other, the city lights painting the walls with a faint gold.

At one point, he turned off the TV, but neither of you moved. There was a falter. A lapse stretching between words. Then, after much thought, you said it.

“Can I ask you something kind of... weird?”

Kenma blinked. “Sure.”

You took a breath. “Do you ever think you’re, like, bad in bed?”

His eyebrows rose. That certainly wasn’t what he’d imagined the conversation would jump to. You winced at yourself. “Okay, wow, that sounded way more self-deprecating than I meant it to.”

“Little bit.”

“I’m serious,” you said, shifting to face him fully. “I’ve dated, right? But it never really went anywhere. And when it did get physical, it just… didn’t go that far.”

Kenma didn’t interrupt. Merely listened.

“I mean, I’ve done stuff,” you continue rambling, suddenly fascinated by the hem of your sleeve. “A little oral. Some handjobs. But, um, I’ve never… had sex.”

There it was. Out in the open. You’d lobbed the confession between you like a live grenade, waiting for it to detonate. Only that it didn’t. The lack of response wasn’t exactly suffocating, though it did make you scream a little on the inside.

Kenma’s voice was gentler than you expected when it came. “Why are you thinking about this now?”

His words made you hesitate. “Because I’m trying to see people again. But every time I get close to someone, I panic. I keep doubting myself—what if I’m not good at it? What if they expect me to know what I’m doing and I don’t?”

A beat.

“And it’s not about being ashamed,” you added quickly. “I just want to feel... in control. Comfortable.”

Kenma studied you. “You could just tell them.”

“I know. But I don’t want it to be a thing. Like, ‘oh no, she’s a virgin, handle her with care.’” You wrinkled your nose. “I don’t want pity sex. Or worse, performance sex.” You dared a peep at him. “Have you…?”

He tilted his head. “Had sex?”

Your ears burned, unsure of whether you wanted to hear the answer. “Yeah.”

Kenma leaned back against the couch, arms crossed. “I have.”

The words sat in the air like smoke. You ignored the tightening of your chest. “Was it good?” you asked. Perhaps, a little too quickly.

He gave you a look. “You really want to know?”

You stammered. “Yes. No. Kind of. For research purposes.”

He smirked. “Of course.”

“Shut up.”

He was quiet for a moment before replying, “Some of it was good. Depends on the person, I guess.”

You hummed, eyes on his collarbone. “Would you ever, uh, be willing to show someone the ropes?”

A pause. “What do you mean?”

You didn’t answer right away. The apartment felt charged, causing your fingers to twist in your lap. Without meeting his gaze, you exhaled shakily.

“I was just thinking… if I ever wanted to figure this out—hypothetically—you’re the only person I’d trust not to make it weird.”

Kenma stilled, lips parting. “Hypothetically?”

“Yeah.”

Another pause. A longer one. “You’re asking me to have sex with you.”

Your stomach flipped. “I didn’t say that.”

“But that’s what you meant.”

You groaned. “Forget it. This was dumb. I shouldn’t have—”

“I didn’t say no.” Kenma looked at you. Not joking, not teasing—just looking. That same sincere care you’d known for years, now sharpened with something else.

Something almost hungry.

“Do you want me to?” he asked, voice low. “Help you?”

Your heart thundered. “Well, I—Only if… you want to.”

He leaned forward. “I want to. Let’s start with a kiss.”

You froze, eyes widening at the abruptness of it all.

“Since, you know,” he added casually, “we’re doing research.” You laughed—nervous, breathy—and nodded. “Right. For the glory of science.”

He moved in leisurely, giving you every chance to pull back. You didn’t. His lips brushed yours once. Gentle and testing, your breath hitching at the sensation. You kissed him again. More assertive than previously. As a result, his hand found your cheek. The angle changed, the excitement deepened.

You realised begrudgingly that your idea had stopped being hypothetical real fast.

Kenma and you grew feverish, your actions slow, then speedy, like you couldn’t get enough. You gripped his hoodie in an act of desperation. His fingers trailed along your waist, reluctant yet calculating. You felt his touch at the hem of your t-shirt and gasped, pulling back.

“I—I need to stop,” you whispered.

Kenma, breathing heavily, nodded. “Okay.”

You sat there, chests heaving, foreheads nearly touching.

“That was…” you began.

“Mhm,” he said, voice hoarse. “It was.”

You didn’t sleep together that night. Be that as it may, something had undoubtedly shifted. Something you couldn’t take back. Neither of you were prepared for what that first sensuous encounter had unlocked.

After the kiss, everything was different. Not in a dramatic, movie-like way, mind you. There were no whispered confessions or next-day declarations. You didn’t even text about it. Not directly, though every message after did have a different weight to it.

gamer boi: you left your ring on the bathroom sink

You: OMGTHANKYOU i’ve been searching for it all day :(

gamer boi: how did you even forget it?? isn’t it your favourite????

You: it’s not my fault someone kept me distracted with his mouth 🙄

gamer boi: don’t act like you didn’t enjoy it

The next time you saw Kenma, you were wearing a sundress with zero intentions of escalating anything. Apparently, it didn’t matter.

You were barely inside before Kenma tugged you in by the wrist, your back hitting the front door with a loud thud. His mouth was on yours again, hands roaming like he’d been starved of touch. His fingers curled around your waist, dragging you flush against him. You let out an embarrassingly needy whimper, arms looped around his neck for balance.

It was supposed to be another kiss. Nothing too intense, nothing too fiery. But soon his tongue brushed against yours—mischievously coaxing. When his knee slid between your thighs, you knew that you were done for.

Your nails dug into his shoulders and he groaned into your mouth.

“Okay?” he checked in, lips grazing your jaw.

You nodded, breathless. “Yeah. Just—you… it’s all very new. ”

He paused. “Tell me if you want to stop.”

“I will.”

That night, you didn’t go all the way either.

But you let him touch you. Really touch you.

You ended up in his lap on the couch, your dress hiked up, his t-shirt discarded somewhere on the floor. His motions were maddeningly drawn out—smoothing over your thighs, teasing under your panties, fingers slicking gently over you until you were shaking. One thing you’d grown to learn thanks to these electrifying escapades was that Kenma neither rushed nor demanded.

Just observed.

He watched you unravel, watched you fall apart with nothing more than his hand between your legs and his mouth pressed to your throat.

You’d returned the favour a week later—kneeling between his knees in that same living room, palms steady even though your mind was a mess. He had gripped your hair, but not harshly—more like he didn’t know what else to hold onto.

And after, when you wiped your mouth and leaned your cheek against his thigh, both of you panting hard, he murmured, “You’re dangerous when you’re confident.”

You smiled. “Guess the research is working, huh?”

His only answer was a smirk.

Life, as it usually does, got in the way. You were swamped at work and Kenma had his own obligations. Days passed. Weeks, even. You didn’t meet up with him, but you felt him everywhere. In your skin. In your thoughts. In the aching, restless emptiness of your bed. And worse: you missed him. Not just the way he touched you—but the him of it. His deadpan humour. The way he’d pause in conversation like he was thinking four moves ahead. The attractive rasp of his voice. The way he drank you in.

You missed your friend. You craved your… something.

You didn’t know what you were to him anymore. In spite of that, you knew that you needed him.

Kuroo’s reunion couldn’t have come at a better—or worse—time.

You’d dressed without overthinking it. Okay, maybe a little overthinking. The black corset hugged your curves like sin. The skirt hit mid-thigh, leaving appropriately enough to the imagination. The oversized leather blazer added a touch of effortlessness you didn’t actually feel. And the platform boots? Tall enough to be seductive.

When you walked into the high-end restaurant, every eye turned. On the contrary, you only looked for one.

Kenma was at the bar, drink in hand, dressed in a black button-up with the sleeves rolled to his forearms. His hair was tousled, face unreadable. But when he saw you, he froze. Eyes trailing down greedily, taking his sweet time. He didn’t smile or wave.

Later, after hours of group toasts, dodging Kuroo’s banter, and pretending you didn’t itch with anticipation, Kenma found you on the rooftop balcony.

The city buzzed beneath.

“You’ve been avoiding me,” you said, not turning around.

He stepped closer, “You’ve been busy.”

“So have you.”

All you hear for a few seconds is the cacophony of traffic and pedestrians.

“You look good tonight.”

You swallowed, your feet carrying you to him. “Yeah?”

Kenma appeared to be just as tormented as you. “Too good.”

“That a problem?”

He didn’t bother with an answer. Reaching for you, he hastily tugged you close. His mouth slanted over yours, hot and aching, weeks (he’d argue, proclaiming ‘years’) of self-control slipping like sand through fingers.

You didn’t even remember getting into the cab.

The moment Kenma’s apartment door shut behind you, it was chaos.

Lips crashing. Hands fumbling. Breath caught between kisses that were all teeth and tongue, no space for thought. Kenma backed you against the wall while you yanked at the buttons of his shirt like you were unwinding every second you’d spent pretending this wasn’t what you wanted. He dragged your blazer off, then your corset. His hands slid up your thighs, underneath your skirt, finding nothing but heat and skin.

“You planned this?” he muttered, strained, against your neck.

“I thought about you,” you whispered honestly.

He cursed, kissing you deeper—ravenous, like the time apart had built a pressure in him he could no longer contain. Soon, you were in his bed. Limbs knotting, bare. His weight on top of you was crushing—so real with almost a decade’s worth of tension, of friendship, of everything unspoken.

His touch skimmed up your stomach, pausing at the curve of your breast.

“I need you,” he said, hoarsely. “Tell me I can have you. Please.”

“I’m yours,” you reassured—just a whisper, but your whole body yearned to meet his. “I want you so bad, Kenma.”

He reached down between your thighs, fingers running through the mess there, working you open. You moaned, legs falling wider to allow him to move inside you better. You were drowning in sensation. His teeth nipped at your chest, hips grinding just barely against yours, and yet—

You wanted this. God, you wanted him. But—

“Wait,” you muttered, voice thin and trembling.

Kenma froze immediately. His eyes locked on yours, reading your face with terrifying precision. “What’s wrong? Did I hurt you?”

“No,” you said quickly. “No, I—”

Your hand pressed lightly to his chest. “I can’t—I can’t do this like it’s solely physical. Not with you.”

The room shifted.

“I thought I could,” your voice was so low, one might believe you weren’t speaking at all. “I told myself this was just for fun. A learning thing. ‘Research.’ But I can’t pretend anymore.”

You looked up at him, shame creeping in. “If I sleep with you, I’ll fall completely. I already have. It won’t just be sex to me. I don’t think it ever was.” You gulped, words turning rawer. “And if that’s not what you want… then this was a mistake.”

Tranquility. Thick. Cracking at the seams.

You felt your panic rise. “Sorry. I know I fucked things up, god. I should leave—"

“Stop,” Kenma finally spoke. Your blathering halted.

His fingers trailed up your cheek. “You think I’d let you in like this—have you like this—if it was just physical to me?” You didn’t answer. Couldn’t, really.

“I’ve been in love with you since high school, you idiot,” he said, and your stomach dropped. “I just never thought you’d want me back.”

You blinked up at him, stunned.

“When we kissed that day,” he continued, reverent, “everything changed. I didn’t want to risk scaring you away, so I thought if I gave you what you needed… eventually you’d see it too.”

He kissed your forehead. “See that I’d burn down the world for you.”

You gazed up at him, shaking slightly. “You’re not serious.”

He kissed your cheek. Your temple. Your nose. “I’m dead serious.”

Emotion swelled in your heart, hand cupping the side of his face. “Kenma…”

He leaned into the touch. “Talk to me.”

“I used to wait for practice to end just to walk home with you. I used to sit in the stands and pretend I was watching the match, but I was only watching you.”

The corner of his lips twitched. His hands ran down your sides.

“I thought I was broken for never wanting anyone the way my friends did,” you whispered. “But then you showed me it wasn’t about anyone. It was about you. It was always you.”

The atmosphere in the room grew charged with something sacred.

“I love you,” you declared, like the words were stolen from your ribs. Like they were always there between the two of you, waiting for someone to speak them to life.

Kenma was silent for one moment—just one—before… “I love you too,” he kissed you like a man reborn. This time, there was no rush.

He moved over you like he was making a vow—hands smoothing over every curve of your body, lips mapping every inch of your skin, like he was trying to memorise the sound of your breath as it caught in your throat.

When he lined himself up and pushed inside, it was slow. Intimate. He didn’t look away once. You clung to him, gaping at the fullness, the sheer gravity of him inside you.

“Alright?” he murmured, brows furrowing in concern.

You nodded, breath shaky. “Better than alright.”

He kissed you again, explosively possessive. After what felt like ages, he moved.

Each thrust was deliberate and claiming. His hand tangled with yours above your head. His other gripped your hip, holding you steady as he rocked into you, building a rhythm that made your back arch.

“I’ve dreamed about this,” he murmured into your ear. “Dreamed about you under me, begging for more.”

You moaned, eyelashes fluttering. “You have me now.”

“Trust me, I’m never letting go.”

Your bodies danced in a symphony that blurred the line between pleasure and worship. You came first, legs trembling. He followed right after, whining your name against your lips, pulsing with everything he felt and couldn’t say fast enough.

While you both lay there—spent and dizzy—you clung to each other. Because you knew this wasn’t the end.

You woke up to sunlight. Golden, slithering between silk curtains and spilling across the sheets in hazy lines.

Next to you was Kenma, his arm draped over your waist. The slight scrunch of his forehead indicated he was still deep in thought even while asleep. The sheets were rumpled around your legs, your body still sticky with sweat and afterglow, and every inch of you ached deliciously.

Oh my god, you thought with a giddy smile.

Your phone buzzed on the nightstand. You reached out, careful not to disturb Kenma, and blinked at the screen.

8 Messages from loser

1 Missed Call

1 Voice Note

You opened the texts, bracing yourself.

loser: where the hell are you?? kenma’s vanished too tf

loser: you better not have left. lev tried to arm wrestle yamamoto and lost. to YAMAMOTO

loser: i swear if you ghosted the reunion i’m kicking your ass

loser: wait

loser: waitttttttt

loser: OH MY GOD DID YOU AND KENMA LEAVE TOGETHER???!!!

loser: TELL ME THIS ISN’T HOW I’M FINDING OUT

loser: ANSWER ME FUCKER

You choked on your laugh, snorting into your palm. Kenma stirred beside you, yawning.

“Mmm… what time is it?” he mumbled, exhaustion evident in his voice.

“Too early for our best friend to be having a meltdown,” you giggled.

Kenma cracked one eye open. “Kuroo?”

You held your phone up. “He’s in panic mode.”

Kenma blinked. Then closed his eyes again and guided you down into his chest. “Ignore him.”

You laughed, cuddling into his warmth. His hair was mussed, bleached strands falling into his eyes. His fingers rubbed lazy circles into your back, like he couldn’t stop touching you in his tired state either.

“I still can’t believe last night happened,” you remarked dreamily.

Kenma nuzzled your shoulder. “I can. I’ve imagined it a thousand times.”

You flushed. “Okay, damn.”

He smirked against your skin. “You think I didn’t spend high school losing my mind over you?”

You were about to answer when his hand slid lower. Then lower still.

“Kenma—”

He rolled on top of you before you could finish. You sucked in a breath as his mouth found yours—inviting at first, then insatiable. Your legs parted instinctively as he settled between them, hardening length grinding slowly into your wetness. His body was still warm from sleep, but his touch was awake. Very awake.

“You’re gonna start something you can’t finish,” you warned.

He kissed your jaw. “Wanna bet?”

You fisted his hair, pulling him back to meet your eyes. “We’re seriously doing this again? First thing in the morning?”

“You’re naked in my bed,” he deadpanned. “If anything, this is on you.”

You were mid-laugh, mid-moan, mid-thigh squeeze when…

“I SWEAR TO GOD IF YOU—”

The bedroom door slammed open. You both stopped, unmoving.

Kenma’s mouth was on your neck. His hand was on your thigh. Your legs were definitely wrapped around his waist. Kuroo stood in the doorway like a horror movie freeze frame.

One hand still on the doorknob. Jaw hanging open. Eyebrow twitching.

You screeched and dove under the sheets like they could erase the last thirty seconds of reality. Kenma… just sighed. Still completely on top of you, showing no signs of clothing himself.

“Get out,” he said flatly.

Kuroo was pale. In a shocking display, he turned red. If possible, redder.

“I—WHAT—SHE’S NAKED—YOU’RE—WHAT—WHY—"

“By the way, I didn’t give you the code to my penthouse so you could come and go as you please,” Kenma muttered, frustrated.

“I thought you were dead!”

“Kuroo—” you poked your head out, expression absolutely boiling—“I’m begging you to forget this ever happened.”

“Oh no. This is burned into my soul. Wait till the group chat hears about this.”

Kenma finally stood up, arranging the blanket properly to cover you like a true gentleman. Instead of being embarrassed, he looked rather annoyed at being interrupted. Like this was your regular Saturday afternoon in the Kozume household.

Kuroo glanced between the two of you, hands on hips, processing.

Then he scoffed, “I watched you two lunatics dawdle around each other for YEARS. Years. You think I didn’t know?”

“Then, why are you surprised?” Kenma asked.

“Because I thought you’d tell me through a well-structured text, not with your fucking nipples out!”

You screamed in humiliation and retreated into the covers again.

Kenma shrugged. “We were busy.”

“Oh, no need to tell me.” Kuroo turned, still muttering to himself, “I'm gonna need bleach. For my eyes. For my brain. For my…”

The bedroom door slammed shut and it was peaceful for all of three seconds. At the same time, you and Kenma burst out laughing. He wrapped his arms around you, burying his face in your neck as you wheezed into the pillow, your body shaking.

“Never living that down,” you gasped.

“Worth it,” he whispered.

And then he kissed you again—slow and soft—like he had nowhere else to be.

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