"No!" Izuna practically shrieked, and Tobirama startled, fingers tightening on his kunai as he stared at his opponent. "Who bested you? Only I'm allowed to beat you! You're my rival!"

Tobirama relaxed abruptly even as Izuna pointed accusingly at him - or perhaps his bruised neck and shoulders - and arched an eyebrow. "Truly?" he asked dryly. "This is your problem?" He rolled his eyes as Izuna opened his mouth on the beginnings of another screech. "Take it up with your brother, then," he huffed, not quite able to suppress his smile, despite himself, "he's the one who marked me, though I assure you," he added archly, "he didn't best me to do it."