To be fair, Osamu's not doing much at the moment, still recovering from his last orgasm and just riding as his twin fucked their boyfriend from behind.

"Kita-san," Atsumu moaned. "Kita-san, you feel so good. Going to fill you up so much."

"Fuck," Osamu groaned against Kita's neck. "Fuck. I'm so hard because of you."