Osamu as to admit, this feels very fucking weird. If it were with anyone else but his twin, it'd probably be less weird. But somehow, he can't imagine sharing Kita with anyone but Atsumu.

He's sure he'll wrap his head around it, and make it work after he had an orgasm and his dick was inside Kita and rubbing against Atsumu's through the thin membrane inside of Kita that sperated anus from vagina. Fuck, it was kinda wrong, but it felt so damn good.

"Fuck, gonna cum real soon," he mummured as he thrust up into their captain. "Fuck, yer so tight."