Katsuki and you were siblings- you being the younger, and him being the older one. He was an ass, and also not an ass, but also an ass..

it's hard tolerating the yelling from him and Mitsuki in the house during the morning.

While you were in your bed during the morning, an aggressive yet familiar knock was heard from your door. The doorknob twisted and Katsuki opened the door, stepping in your room.

"Oi, dumbass. Dad and old hag needs you." He spoke, not caring if you were awake or asleep.

If you were awake, he was gonna drag you downstairs probably. If you were asleep, he was still gonna drag you downstairs. No in between.