Somehow, he manages to keep quiet as he keeps moving, and that orgasm finally hits him, quick and sudden, almost taking him by surprise, but that's probably due to the fact that she's kissing him, as much as anything else, because he knows that if his mouth were free, he'd very likely be shouting right about now. As it is, he's gripping onto anything he can find, which includes her hip, one hand braced against the wall, practically shaking as the sensations wash over him, trying desperately not to cry out.

Damn, but this was a good idea. It's only encouraged him to try it more often.