Bel is taking the opportunity to watch Barcus. While Bel admits he is a bit of a showman, there is a lot to be said for sincere eagerness. Barcus isn't messing around with getting undressed, because clearly he wants what's next as much as Bel does.

As soon as Barcus is back into arm's reach, Bel is moving his own hands to touch whatever bare skin he can reach. The feel of Barcus's breath against his stomach causes his heart to jump, among other sensations. "Gods, yes. Tell me if you need me to change position. I'm in your capable hands, for now. Or other parts."

Bel might be experienced in general, but Barcus had more experience with this particular size difference (even if it was a grand total of one other person). And he did intend to make sure both of them were equally satisfied.