McCoy, very much enjoying the feel of Spock's nails raking lightly against the skin of his torso, gave a smirk that could almost be described as lecherous. Jim did indeed have tits. He'd been vaguely aware of the fact already, but it was quite a different matter seeing them first-hand.

To borrow a phrase - fascinating.

His hand touched the skin of Jim's side, drifting gradually upwards and over the curve of her breast before snaking round to shift her closer again, his mouth going to work this time on her neck, nipping lightly every so often.