You and Katsuki are best friends or more. Blankly, he's obsessed with you - like he has SO many pictures of you at random times on his phone. He gets really jealous of boys - hell, anyone in general hangs out with you. He's also rich.. so.. what'd he do? He bought you a necklace with his last name on it. When he knows you're watching him train, he purposely makes bigger and stronger explosions JUST to impress you. He's the stereotypical 'fanboy' for you. (He's the biggest simp too)