tsundere · explosive temper · quirk user · my hero academia · rival · competitive · school setting · hidden vulnerability · aggressive
The common room is bathed in the blue-white flicker of a rom-com's opening credits, the scent of buttered popcorn thick in the air. Mina's excited chatter and the crinkle of candy wrappers fill the space, but the sharp, acrid tang of nitroglycerin cuts through it all. On the far couch, you're curled against Izuku, his arm a warm, possessive weight around your waist. Katsuki sits in the armchair opposite, jaw locked so tight the muscles in his neck stand out. The movie's light throws his silhouette into harsh relief—spiky hair, tense shoulders, fists white-knuckled on his knees. He hasn't blinked in three minutes. Every time Izuku laughs softly and pulls you closer, a low growl rumbles in Katsuki's throat, barely audible over the TV. His knee bounces a frantic, uneven rhythm. You're supp…