"What the hell are you doing, Fucknerd?!" yells Katsuki from where Izuku is digging him from the slime "Helping you, you frickin' dingus!" Izuku shouts back in his face with an angry sort of determination. Or, Izuku is the Doom Slayer and gets strong when he gets mad. (Not my first story or even the first one I've ever posted but it's the first one on this account)