Fuck. He couldn't have stopped now, even if he tried. Jim's mouth was so wet and hot, sucking him with just the right amount of pressure. Made Bones feel like every nerve in his body was concentrated on this one spot, where he and Jim connected.

It wasn't going to take long, he knew, so he slowed his thrusts down, trying to draw out the feelings, and let his mind open up so he could share this with Spock.