Edited: 7/14/18; 4/28/19

Katsuki stood in so much shock, that it was as if he was told he suddenly became quirkless.

You tilted your head confused at his reaction. The blonde boy suddenly came storming up to his father and you.

"Why the fuck did you allow this shit!? You actually went with this crazy hag's idea!?" He yells as if he were scolding his dad, who animatedly sweatdropped.

'Why am I to blame?' Masaru thought to himself.

Katsuki grabbed the back of your shirt and lifted you out of his father's hold, and opened the front door. "We don't need you extra, get lost, goodbye shit." He sat you down on the doorstep of the freezing cold night then slammed the door behind him.

".... Huh?" You stutter in surprise staring at the front door before you thinking, 'What just happened?'.

Seconds later, a loud bang was heard followed by muffled curses that were spewed out loudly. But, it seemed like the entire neighborhood is used to it as they continue on like nothing is happening.

When it was all calm, Mitsuki opened the door, picked you up and brought you back inside.

"Why the fuck do we have to keep that thing!?" Katsuki yelled. "It's like having a fucking dog there's no different!"

"Why the fuck are you still cussing, haven't I told you not to!?" Mitsuki yells back no longer able to hold her annoyance for her loud son. But before another argument of cusses can manifest, Masaru abruptly interrupted.

"Well a-anyway, Katsuki, your Mother and I have to prepare your sister's bedroom. So please watch over her till then..!" He speed talks quickly giving you to Katsuki and urged you both up the stairs.

The latter huffs in annoyance and lazily carried you like a pillow, looping an arm under your abdomen and since you were still 4 you weren't so heavy.

He grumbled under his breath as he walked up the stairs. "One fucking scratch, bruise, burn or tear I see and your fucking grounded, you hear me!?!" Mitsuki yelled from downstairs, destroying his plan of tossing you out the window.

"Whatever!" He yelled over his shoulder and trudged to the room kicking the door open. Looking into his room, you notice it was decently clean —surprisingly. The bed wasn't all messed up, the room is clean enough for a normal person to work in and it doesn't stink, but it does have some hint of caramel scent that made you wonder where it was coming from.

Its probably like this so Katsuki can keep his mom from nagging at him, which he finds incredibly annoying.

Without care, Katsuki tossed you onto the bed, which sunk under your weight. From the sudden weight, the blankets flew up and landed over you. The boy watched you struggle under the tangling sheets before rolling his eyes and heading to his desk that had unfinished assignments he planned to continue before his mom came.

The room was quiet except for the scratching of pencil on paper.

You successfully untangled yourself from the blankets and observed your surroundings.

Everything poked almost the same as your room in the orphanage except for one item that lay on a high shelf.

"Who's this?" You asked holding an action figure of the No. 1 hero, not that you know at that time.

Tv has always been an off limit for children under 9 in the orphanage, barely even be a privilege to even be used by any of the children there. So you have no idea who he is by looks. You let your small fingers trace the structure and shape of the old toy, letting your mind memorize the item before it was removed from your hand and placed on a higher shelf.

"Don't touch that," Katsuki said monotonously.

"B-But who is that?" You asked completely curious. Katsuki blinked in surprise as he took the toy back.

"You don't know who the fuck this is?" He asked you and you shook your head. "This guy is the number one hero, he's really strong. But, if I am able to surpass him —which I will. I'll be the strongest in the world. I would be so rich, everyone would praise me. I have a long future and successful carrier ahead of me. Every second count." He said.

"Uh...."

"ARE YOU FUCKING LISTENING!?!?" He yelled in anger making you quickly nod to that.

"Oh wait, then that means you must be really strong!" You concluded.

"Of course I'm strong! That's what I was telling you—"

"I knew it! I knew big brother was amazing and cool! Wow!!" You cheered in glee jumping on the bed.

"Shut your trap, it has the most annoying sound I ever heard," Katsuki muttered falling on to the bed shoving his face into the closest pillow. You tilted your head in question but took the action figure from him to observe it more.

Katsuki peeked one eye at you from the pillow and saw your chubby face that looked adorably soft and eyes that seemed to look like the stars themselves. 'Those cute eyes...' he thought.

'The fuck!? Get your head in the game! This is only an extra, not part of  your  future plans and completely is gonna be completely in your way!' He grumbled loudly in annoyance. Hearing his grumble made you look at him curiously but before she could ask their mother suddenly opened the door.

"Katsuki, we are almost done with (Y/N)'s room, you go and give her a bath. New chore, you are in charge of preparing (Y/N) for bed," she said and left the room just as the boy cussed in surprise.

"Agh! Fucking hag! Why am I assigned to do this fucking chore!?!" He yelled in anger.

"Do it you shit! I'm too happy and excited to deal with your crap!!" Mitsuki yelled through the wall that seemed to be where the old guest room resides.

"What's wrong big brother? It's only a bath..." You said still young to know that the opposite of gender isn't supposed to bath together.

'But since she is a kid, I guess its no harm...' Katsuki sighed and stood up grabbing the back of your collar and started dragging you to the bathroom down the hall opposite to the stairs.

But it came to the realization that he has to undress you and bathe you like he does the work, most likely because you are still 4. The confidence that was there before is now going down the drain and slight horror and disgust were shown in his irises.

'The horrors of having a sibling' he thought.

[So Then...]

The squeaks of the faucet echoed in the tiled room as a blonde bomb sighed in loss of interest and turned to you, who was having trouble taking off your T-shirt which was the only garment you can't remove on your own. He pinched the bridge of his nose knowing very well he has to live this through until you are old enough to do these things on your own.

"Seriously?" he huffed and roughly removed the T-shirt tossing it over the shoulder and successfully shooting it into the hamper behind him near the door, without looking.

"WOAH!!!" you awed in amazement as he picked you up. "Can you show me how to do that!?!" You asked in excitement accidentally screaming making him wince a bit because your voice was amplified in the room.

Without a word he merely dropped you into the tub that was slightly deep for you but just enough that it reached your shoulders.

"C-Cold!!!" You squealed as the shivering in the cold waters in the tub.

"Oops sorry I forgot to turn on the fucking hot water..." Katsuki said not really caring just saying for the sake of it and sat back on the dry chair he set up in the room. His arms were crossed and his frown was visible as you shivered a bit before getting used to the temperature.

Katsuki actually got so bored that he just fell asleep like that. You, on the other hand, was ready to apply the daily equipment when taking a bath but seeing the boy, who was supposed to be the one giving you a bath is asleep, you decided to do it on your own.

[--]

'[1 week ago]

"Why the fuck do you want to adopt a brat!?!" Katsuki yelled eating his dinner with his parents. This happened a week before they adopted you and haven't planned on doing it yet.

"Look Katsuki to put this in a simple easy way...

You act like a big shithead, I mean come on! Is this the child I had tried to raise!? You take these people's praises to much! You need to learn how to know the world is not spinning for you!" Mitsuki yelled pointing at her arrogant son who scowled at her.

"Of course it is you shitty hag! And if it doesn't then I will make it! The number 1 hero is my destiny and I'm going to make that happen! Then finally I can get out of this hellhole..."

"Katsuki, please know we are only doing this for you, you need to know how to care for another human being other than your own..." Masaru tried to ease the hotheaded duo.

"Yeah, cause I'm sure they won't be a girl on this world who can handle such shitty temper and arrogance..." Mitsuki muttered under her breath but still made sure to let him hear.

"WHAT DID YOU SAY YOU OLD HAG!?!"

"YOU HEARD ME WELL YOU BRAT!!"

"I DON'T NEED TO CARE FOR ANYONE! I GOT MYSELF! IT'S NOT LIKE I'M GOING TO HAVE A FUCKING SIBLING OR SOMETHING!!!" And that my dear friends is how Katsuki started his own problem'

"AAAHHH!!!!" Your screams jolted Katsuki out of his short sleep and he stood up in surprise to find you on the floor whining that you hit your arm at the sink whilst trying to reach the shampoo.

"What the fuck were you doing?" He grumbled in anger of being woken up but already figured it out, he was just cranky right then. "U-uh.... oh hello dear brother! You look weird with that face, well I was trying to reach the shampoo by myself since you were sleeping, did I wake you?" You smiled innocently with hints of nervousness in your crooked smile.

"WHAT DID YOU SAY YOU FUCKING BRAT!?!?!?!" The already angered boy yelled in fury as they started a water fight, he could try to drown you but his mother has some crazy mothers hen scenes that alert her if you're in danger. And it turned out they took a bath together in the end.

'As if I'm ever going to care for this little shit!'

===============================================

Yes, I know this completely shorter than the first chapter but that was because I needed it to be in one chapter, and this one is shorter cause I changed the plot.

Forgot to warn you guys about the curse words but I guess you knew that already! I mean come on... It's Katsuki!

Peace! X3