To be fair, until this moment, Osamu didn't know either. He knew Kita was trans, he knew Kita was a man, and he was attracted to him. He was the gay twin, and he liked dick. He had assumed that he'd take Kita from behind most, or Kita would put on a strap-on and fuck him, while Atsumu would take care of pleasuring Kita's pussy.

But having a dick didn't make someone a man. And Kita was a man. Of course, having a dick in someone's snatch was different than eating one out... He'd cross that bridge when they came to it. "Fuck," he moaned, burying his face into Kita's neck as he began to move.