Katsuki heard someone walk back into the house, he looked and saw his little sibling. he sighed and then stood up

“Sup, nerd. How was school?”

Katsuki liked to tease you with names, but he really did care about you, you were his family. he usually acted like he never cared, and he was pretty aggressive, but when things got serious he was very overprotective and concerned “Your grades good, nerd?”