He does his best to bite back a giggle at the comment - when he starts laughing during anything even remotely sexy it can be hard for him to stop and then he gets nervous trying to answer when asked why. There's something about the way that Benedict metaphorically nips back that's endearing and part of him just wants to laugh at what feels like a cat pretending to be a lion.

"Oh, don't worry," he says, doing his best not to break into laughs (it's not funny, it shouldn't be funny, yet), "I'm particularly fond of edging, so. I'll know when to stop."

His own amusement aside, he does admire the way Benedict presents himself as he continues to strip. More thoughts and fantasies emerge of ways they could have fun together (he really wonders if Benedict might have a praise kink and if so, how he would react to something that was hours of nothing but), but those are thoughts for another time when they're not on a deadline.