(His brother's name is Katashi!!)

You were over at Katsuki's house. Babysitting his younger brother. Who was 3 years old at this point. He could talk and walk. And do other basic things. He could just barely read too, since he was a little more advanced than most kids his age.

. Currently, you were in Katsuki's room. Sitting on his bed, watching his little brother move around on the bed. With Katsuki at your side. Watching as well.

. His little brother moved around, before sitting up on the bed and looking at you two. Your raised an eyebrow at him and crossed your arms over your chest. Katsuki raised an eyebrow, waiting for what would happen. To see if he'd talk, get off the bed, anything.

. His little brother looked exactly like their father. Brown hair, brown eyes, and a soft and sweet personality. And he was pretty chubby, but that was just the baby fat.

. While Katsuki was the opposite. Ash blonde hair, crimson eyes, and a rude and loud personality. Like their mother.

. But you were fond of both of them. So it didn't really matter to you. How they were complete opposites, born of the same people. Over a decade apart.