Katsuki absolutely wasn't jealous.

You were part of the Bakusquad, sure, but very amicable with everyone else. You played videogames with the squad, went shopping with Deku and his gang, studied with Iida and Momo, listened to metal with Tokoyami, hell, you even helped Koda with his animals.

Everyone loved you. They hung on to your every word, bought you snacks, Katsuki was pretty sure he once saw that Icy-Hot bastard massage your shoulders with his heated hands. The 'Class Baby' they called you, which didn't fit in his opinion. You were nowhere near innocent, and yet, because you were pampered so much, you were lovingly dubbed as such.

It wasn't fair. You were his childhood best friend, after all, the one he wanted to see become a top Pro Hero with him. Why were you giving so much attention to everyone else and not him?!

One evening, Katsuki came downstairs after showering, Tsuyu and Tokoyami were cooking, the Dekusquad was studying on the tables, Momo and Jirou seemed to be having some intense discussion, Aoyama was bedazzling Shoji's costume for the sake of it, and everyone else was doing their own thing.

His eyes searched until they found...

You, wrapped in a blanket (was that Katsuki's hoodie you were wearing?), were cuddled against Kirishima's side, Mina's head in your lap, Denki and Sero laughing on the floor as they played Mario Kart, you three watching. He could see the snacks people left for you on the table.

"Move up." He towered over you, scowling. He unceremoniously shoved Mina and Kirishima away from you. Not that they minded; they just laughed, knowing he was insanely jealous. He huffed and sat down, pulling you close with gentle arms. Much better.