"Ah, Izu?" Madara began tentatively, moving into the main room. "Are you-"

"No, no!" Izuna waved a hand, the other one still clamped over his eyes. "Let's never speak of it again! Also I am never coming into your study when the door is closed ever again." he added with a full-body shudder, mouth twisting.

Madara cleared his throat, torn between blushing and laughing at his brother - he'd been trying to teach Izuna boundaries since he was tiny, and apparently all he'd needed to do was . . . be caught fucking his little brother's friend cum rival across his desk.