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prettyboykatsuki · 2 years

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brothers best friend | k. denki

☆ tags ;; fem!reader (she/her pronouns + being referred to as kirishimas little sister), ambitious but cold!reader, charming denki, no quirk au, brothers best friend trope.

☆ wc ;; 1.6k

☆ a/n ;; oh boy

☆ synopsis ;; your brother has made it very clear that he doesn't want you around denki. but meeting him makes you forget all of it in an instant.

You've developed an immunity to flirting.

You think most of it was an indirect result of your clumsy but thoughtful older brother. Kirishima is your direct opposite. Gentle, very socialable, always smiling. He's always had wild ambitions that he's acted on and pursued recklessly.

He is picture perfect and the best example of a filial son you know, albeit rough on the edges. Even as his younger sister, you felt more of a responsibility towards Kirishima than not. Quiet, studious, unassuming. You could never be like him so you made up for it with your achievements and accolades.

And most noticeably, you're unreachable to most. You've always been reclusive but it's not helped by your busy schedule and desire to achieve. You think it'd be nice to be a spoiled kid, but it doesn't feel like something you can actually do.

The thing about being accomplished in general is that you tend to receive attention from the wrong types of men. It's given you a super power for sniffing out bad intentions ten minutes into meeting new people. You've never been easily swayed by anyone romantically.

Even if someone's attractive to you, it's ruined as soon as they open their mouth. While sometimes you wish you were more open or maybe more romantic, your cynicism has carried you so far.

And because of this specific immunity, you have never been charmed by a single one of your brothers friends.

Your brother has very attractive friends. This is an objectively true statement. His best friend, Bakugou Katsuki, is model worthy to look at. His temperament has relaxed a lot in the last 5 years making him cool and mysterious boyfriend material.

Not to you, of course. But in general. You know Bakugou too well and even despite knowing how dateable he is - you've narrowly avoided having any serious feelings for your whole life. After him is Sero Hanta, who Kirishima has only let you around a handful of times.

Sero Hanta is a casanova and a flirt. Every time you have talked, he's made a pass at you with a well-intentioned smile. And maybe if you were a little more naïve, he had potential to be your first heartbreak. Sincere or not, he's pretty tiresome.

Among his friends, you've also met Izuku Midoriya who has the classic boy-next-door aura to him, humble and awkward. Next, Todoroki Shouto, who is so ridiculously handsome and nice (and RICH) that he's completely out of your reach. Shinso Hitoshi, the cool and collected gamer who's cut and dry while also feeling dangerous.

All of them are what you'd expect of your brothers friends, exceptionally cool. You're always confronted by their dateability when you're hanging out with girlfriends and one of them comes up to you for a chat.

The phrase "would you mind introducing me to..." is really starting to make your ears bleed.

But you've never fallen for them. You've put up an iron wall about one million feet thick and have stayed on the lit path of celibacy for many, many years. Fully with the intention that dating can wait until you've graduated with a job and money. You're ambitious and you like it. And dating just doesn't seem like it's for you.

There's only one friend of your brothers you haven't met, his best friend - Denki Kaminari. Kirishima dormed through highschool AND college, but even when Kaminari would come over you always managed to miss him. He went through an exchange program in college and then disappeared for a few years.

And plus, Kirishima is pretty secretive about him in general. Every time you express interest - he redirects you and firmly sets the boundary that you don't need to be interested. You don't know much about him at all other than he's a lot like Kirishima in some ways (words from Bakugou himself) and that he's got long blond hair with a streak of black in it.

You don't... get it. What the issue is. Not really, anyway. But you've long since given up on the endeavor. If you haven't met him up until now, you're pretty sure you never would and that if you did - it would be some unlucky incident.

You are.. half-right about that.

Your big brother gave you keys to his new apartment a few weeks ago. His career is earning him big bucks but he thinks the place is too empty, so you spend a good chunk of your day in his house - using the office he doesn't need to study instead of suffering in the library.

Today is another day. Kirishima comes home from training around 5, and you're arrived promptly at 2:30. Your plan is clear. You'll study for an hour, cook something for him for after practice, then hole up and study some more. You'll probably spend the night since you don't have any classes till Thursday and you'd rather not see your roomate today.

As usual, you unlock the door. But when you come in there's a pair of shoes on the rack that you don't recognize. One pair is Bakugou's, dirty and beat up airforces. Another is a clean pair of black sneakers, too stylish to be something your brother owns. Your best guess is Sero. Since it's him, there's not need to announce your presence.

So you walk into the kitchen, bag still half on your back and ready to rifle through Kirishima's fridge for something to eat.

But your stopped dead in your tracks, knocking into what you assume is Bakugou from the glimpse of blonde. When you open your eyes to look, you're expecting Bakugou.

It is not Bakugou.

Another blonde, but definitely not Bakugou. He's got long hair, and it's a little more gold-blonde than the pale platinum. It's up to his shoulders, half-up and half down with a few strands of black running through it. When you step back, you realize how tall Not Bakugou is too. At least a foot over your head.

You blink twice, wracking your brain for who this could be. Your thoughts are scattered. He's got a lip piercing and a tattoo, just the one and honey-gold eyes.

He's... very, very pretty. And very disarming. You open your mouth only to shut it again.

"What's a girl doin' in Kirishima's apartment?" He shouts, and then you hear Bakugou say something back. The words don't really register because you're too busy staring.

"Oh! So you're his lil sister huh? I thought you were like.. a little kid. Guess it's been a while." He says, mostly to himself, then leaning in to look closer. He holds his hand out for you to shake "I'm Denki Kaminari, your brothers friend."

You have a lot you'd like to say but the words come up short.

"Oh," you say lamely, shaking his hand "Uhm. Hi. And yeah, I'm Y/N. Nice to meet you."

"Cool, cool. I've heard a lot about you. You're a student, right?"

"Yeah. Came over to study for a while and make dinner." You reply, on autopilot. He smells really good, now that he's so closed to you. Clean and kind of sweet. He's so pretty.

You can feel it fill your head, blinking up at him with dazed eyes. He meets your gaze with nothing but pure warmth and friendliness. You always knew he was extroverted, but his whole aura really shows it. You don't even notice Bakugou at the other end of the room, keeping close watch.

"Ah, we must've ruined your plans."

You shake your head, somehow troubled by the idea of it being an inconvenience.

"Oh, no. Not at all, I don't really mind cooking for more people."

"Yeah?" He grins, his tongue darting to play with his lipring. You need to stop staring "Awesome. A homecooked meal sounds really good, honestly. Traveling is fun but I missed Japan a lot."

"You haven't gone home?" You ask reflexively. He shakes his head.

"Nope. So you'll be my first one back. We should drink to celebrate. You can drink, right?"

You nod again. He smiles once more, this time with his teeth flashing.

"Then we'll have to drink for sure," He says, reaching his hand out to pat your head which makes you freeze "You should come hang out for a bit if you aren't too busy."

"I should...study. Calc 2 midterms are coming up," His disappointment makes you stumble "But after dinner is fine."

"Nice. Looking forward to it, but I won't hold you anymore. It was good meeting you."

"You too."

Quickly, you skitter into the office like you had planned earlier. Your hearts thumping in your ears as you drop your bag on the floor, folding up with your hands covering your face.

Oh god you can hear your heart beating. You're so fucked.

Kaminari leans on the counter as Bakugou comes up behind him. His eyes are lingering on the door, half smiling.

"Kirishima's gonna fucking kill you." Bakugou says seriously. Kaminari shrugs, sighing a little "Making a pass at his sister when he's not home? You're dead meat."

"But she was super cute though. How could I not?"

Bakugou tsks.

"Yeah, obviously but I don't think I've ever seen her bring anyone home. No less one of us." Bakugou says with a sigh "And being honest, if you plan on just messing with her - I'll happily kick your ass."

"Oh, come on, who do you think I am? Sero? I'm interested that's all! You don't think I'm boyfriend material?"

"I'm fucking serious, Pikachu. Don't be a dick to her, or I'll rip you to shreds."

"Oh my god, I said I'm not!" He says with a sigh, glancing at the door again "She's cute. Obviously I'm gonna be a gentleman to her. Plus I think she already likes me."

Bakugou laughs.

"Yeah, I think so too."

#kaminari x reader #bnha x reader #denki x reader #bnha fluff #im passing away #writing tag #BROTHERSW BEST FRIEND DENKI ..DFVNJGDFBJHD

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