He paused, looking up at Dirk's face to gauge if that bending forward was good, or pained, or what. When he ascertained that it seemed to be a positive response, he kept his grip the same and shifted back down, then up again.

"...figuring you were probably aiming for this sort of thing to happen, I don't suppose you have any supplies?" Because wanking a guy off without lube or a condom might chafe, if he remembered correctly.