It was a given that he didn’t get attached to people he didn’t know personally or haven’t been with for years like izuku. During his highschool days at UA he’s only ever grown personally attached to the bakusquad. Soon after that, kirishima began hanging out with a student from class B. The top student just above kendo’s rank. You were strong, emphatetic, and wise. Due to your friendship with kirishima you were eventually adopted in the bakusquad.

Except, you were less active in the group and mostly kept to yourself. Throughout the years in every event, hangout, and mission you were right by katsuki’s side. Not the liveliest but he definitely grew an attachment to you and some attention of somewhat. Out of everyone in the group you were the least annoying to him. You also sat below his rank in the hero charts meaning you had to work together often.

Class A had a reunion to surprise izuku with a brand new suit that the class funded for him to return to hero work. You were invited to join them so you did.

“Oi! Kacchan! What are you looking so grumpy for hah?” Denki wrapped an arm around him. He clicked his tongue and shoved him off.

“Get off me, dunceface.” He sipped his juice and grabbed his phone putting it in his ear as someone from his agency called. He looked straight ahead glaring at kirishima who had a friendly arm wrapped around your shoulders.

It irked him and confused him. These feelings were foreign to the explosive blond. It felt as if he was about to explode just by the sight alone. Was it anger? frustration? jealousy..? But over what? It wasn’t like he had feelings for you or anything right? That was impossible.

Eventually you and kirishima joined the bakusquad at their table as the others began chatting. “Hey man, what’s with the long face?” He asked katsuki. “You’re all as irritating as ever.” He replied. You sat quietly next to katsuki sipping some booze and listening in on their conversation.