Kirk's entire body tensed like a bow string, and he turned his head to look at Bones. Shit... He hadn't even noticed the running shower or that Bones had come into their quarters. When he was sleeping? When had he gotten so used to Bones that he could sleep while Bones came in?

Kirk licked his lips as Bones vanished, his hand tightening on Nyota's and dropping entirely from Spock's. His heart was beating faster, and there was a strange twisting feeling in his stomach that he couldn't remember ever feeling before. When had he ever gotten nervous about something so simple as sex?

Maybe when you realized there was something more going on here? He thought grumpily to himself, then looked to Spock.

He grabbed the Vulcan's hand again, eyes firm. He's the missing something.