Okay,this does involve incest. So if you don't want to read such things,you're more than welcome to wait for the next oneshot 😂
Enjoy~
No one's p.o.v
You gave a sigh of relief,"that's all mom!"
"Thank you sweetie!" She kissed your cheek,getting in the car.
"Have a good trip." You smiled.
"Goodbye boys!"
You and katsuki waved to your parents as they drove off.
He stormed back inside after they were out of sight. You followed him.
"What's wrong with you?"
"Nothing."
He went to his room,slamming the door shut.
"Katsuki,don't give me that attitude." You opened his door.
"Fuck off."
"No. What's gotten into you? You were fine this morning and now you're mad. What happened in the last 4 hours?"
"Piss off. I don't want to talk about it."
"I do. I'm your big brother. You can tell me anything. You don't have to keep secrets from me."
"Just fuck off! You're always getting in my business!"
He pushed you out of his room,closing his door and locking it.
"Katsuki!"
"Fuck off!"
You sighed,"fine."
He stayed in his room for the entire day,only coming out to use the bathroom and occasionally get something to eat. You did find it weird that he was being so grumpy but katsuki had always been a very grumpy child. It was nothing new that he wanted to be alone. So you,being the big brother and all,decided to just leave him and hope that eventually he'll talk to you when he wants to.
It was 21:30pm and katsuki still hadn't spoken to you. You were getting worried so you went to his door,knocking on it.
"Katsuki?"
"Fuck off Y/N."
"Can you please just tell me what happened?"
"No."
"Why not? I'm your big brother,you can tell me anything."
"This I can't."
"Why not?"
"Because! Just fuck off!"
"Not until you tell me what's wrong."
"Y/N I don't want to talk about it!"
"Please. If you tell me what's wrong, I'll cook something you like."
"No."
"I'll do your laundry?"
"No."
"I'll make your bed everyday!"
"No."
"I'll buy you a rare all might figurine!"
"NO!"
"Please! What do I have to do for you to tell me what's wrong?"
"Piss off!"
"Katsuki I'm worried about you. Please."
There was a long pause.
He opened his door,"you're worried about me?"
"Of course I am. You shouldn't feel like you have to keep things from me."
It took him a minute but he gave in.
He sighed,"okay."
You smiled,"so you'll tell me?"
"No,but I won't hide in my room anymore."
Your smile dropped. He started laughing,running to the kitchen. You ran after him.
"Come here katsuki!"
"No!"
You were laughing with him and chasing him around the house.
You finally got him at the couch. You pinned him down.
"Got you!"
His laughing died down. So did yours. Now it was just you on top of him.
You looked at each other,panting and smiling a little.
Your eyes wandered to his lips and you felt your heart stop.
What am I doing?!
You got up,ruffling your hair.
"I'm gonna go to sleep."
"Yeah,same."
He laughed nervously.
You both ran to your rooms,feeling not only embarrassed but also extremely flustered.
You sat on your bed.
What was that? Why did I look at him like that? Why did he look at ME like that?
You quickly went to the bathroom,looking in the mirror.
"What is wrong with me?" You mumbled.
You took a hot shower to clear your head.
After you were done,you put your shirt on, wrapped a towel around your waist and exited the bathroom.
Your eyes widened when you saw katsuki coming out of his room.
He was sweating and his clothes were drenched.
"What happened to you?"
"Nothing." He sped past you,going into the bathroom and locking the door.
You weren't satisfied with his answer so you walked into his room. You started snooping around,looking for something that could lead you to why he was so angry before.
You found his diary and hid it in your shirt. Then the door opened.
"OH MY GOD!"
"Don't be mad."
"WHAT ARE YOU DOING IN MY ROOM?!"
"I was..waiting for you?"
"WHY?"
"I.." You had to think of a lie but nothing was coming to mind so you just hugged him.
"What the fuck is wrong with you?"
"Nothing. I just..I love you man."
He didn't respond.
You let go and walked out of his room,running back to yours.
Fuck fuck fuck fuck fuck.
You closed your door and sat at your desk. You took the diary out of your shirt and started reading the entry that was made in the morning.
Dear diary,
Mom and dad left now its just me and Y/N. To be honest,I'm scared to be alone with him. I know he's my brother but when he's around me,I get..this weird feeling. I know its wrong but I can't stop thinking about him. Why do I..want him? We had a fight too. When mom and dad drove away,I looked at him and his smile gave me this weird feeling. Like I wanted him to..kiss me. Is that weird? I know we're brothers but I can't help but fantasise about him..doing things to me. Things like-
You shut the book.
"Okay,that's enough reading." You took a deep breath,"wow. Holy crap."
You started pacing around your room.
"What the fuck am I supposed to do now?"
"Y/N!!"
You froze,"Yeah?"
"Give me my fucking diary back you asshole!" He punched your door.
"Fuck." You said,grabbing the diary. You slid it under the door,"don't hurt me."
"Did you read it?"
"No."
"Liar."
"Maybe?"
"Y/N!!"
"Yes."
"I fucking hate you!" He punched your door again.
You sighed,"I love you too."
You heard him walking away.
"Bakugou?"
"What do you want?"
"I know how you feel.. And I understand.."
"You don't know shit."
"I do. I read what you wrote.. And I feel the same."
You heard him walk back.
"What?"
You opened the door.
His eyes were watering,"tell me you're fucking lying."
"I'm not."
"Don't you dare play tricks on me."
"No tricks. No lies."
"Are you making some shitty joke? Cause this isn't funny-"
You put your hands on his cheeks and leaned in,kissing him softly.
He kissed back,not hesitating at all. He wrapped his arms around your neck.
Your hands slid to his thighs and you picked him up, taking him to your bed.
You gently laid him down,still kissing him passionately whilst he moaned beneath you. Then you took your shirt off and began kissing his neck.
You pulled down his trousers and boxers then you took off the towel that was wrapped around your waist.
There was no point in doing preparation so you just entered him. He moaned loudly,one of his hands gripping your hair the other digging its nails into your back. You groaned as you thrusted into him. Slowly but powerfully. You made sure that with every thrust,you hit his prostate.
He took deep breathes.
Time skip~
You leaned in and rubbed his thighs as he sat on the kitchen counter.
He smirked,his lips barely an inch away from yours.
"Don't tell mom and dad." You said,leaving small kisses on his lips.
He wrapped his arms around your neck and pulled you closer.
