Your brother was a big socialist, he was a year older than you (he was 17 and you were 16). One day he took one of his friends home to train and asked you not to interrupt.

When they finished training, your brother told you that Katsuki was going to stay the night and that the three of them could have a sleepover and you agreed, but your brother fell asleep quickly and left you talking to Katsuki.

-"Huh. idiot, he says to do something and falls asleep."

Katsuki snorted and crossed his arms.