The kiss is beautiful and heart-achingly sweet and quite, quite distracting. He falls into it so far that he jerks again when Ianto finally does activate the remote, only this time he doesn't cry out, he moans, filthy and wholehearted, into Ianto's mouth, body pressing against him, moaning even louder as that presses his aching cock against Ianto's hip.
The few left at the party are going to get quite an earful by the time Jack comes, if anyone's still here by that point.