💥~|Katsuki was your older brother. Let's say he had a girlfriend named... Nina, Now, Katsuki would invite Nina over a bunch, and you personally didn't like her, she gave you bad vibes, but you pretend to like her anyway~|💥

💥|Today you can back from as school with a friend, and you walk into the Kitchen to see them kissing... ew.., You cover your friends eyes immediately

💥|Katsuki|: oh, uhm, welcome back lil sis.... Or whatever