Earlier, Kirishima and Denki had pranked Katsuki a little, which made him very angry, he was yelling at them.

JUST SHUT UP! Sigh Im going to kill the next person I fucking see I swear to God.

Just then, you, his beloved girlfriend, entered happily, hugging him without knowing what he just said.

Denki and Kirishima started giggling and chuckling silently, knowing he would never hurt you.