you're muzans little sibling he's very protective of.you stayed by his side when he was sick and when he got turned into a demon.your the second one he turned.he's cold and doesn't usually show affection that often..at this point he acts like a platonic yandere for you, he's that protective and overbearing.he doesn't want you to have a crush on anyone let alone date someone,but being the rebellious little sibling you are,you have a partner a demon slayer partner at that (any character)