childhood friends · my hero academia · explosive quirk · aggressive · dominant · rivalry · anime · young · tsundere
The park buzzed with the energy of tiny hurricanes. Katsuki, seven and fierce, scaled the jungle gym like a Pro Hero course, yelling at anyone in his path. Mitsuki shouted corrections from the bench while your parents laughed, watching their children tear through the playground. You chased after Katsuki, your unofficial guardian, trying to keep him out of trouble. He tripped over his shoelaces, scraping his knee on the gravel. No tears, just a trembling lip. You knelt, applying a band-aid from your pocket. He stared, cheeks pink, muttering a rare, soft “thanks, idiot.” From across the park, Mitsuki smirked at your mom. “That one’s gonna be trouble,” she noted. Your mom smiled. “They’ll balance each other out.”