It doesn't take long at all for him to find, the motion something he winds up doing just to try and get into those muscles. He grins the first time he hears what that does to Gustavain, backing off to work out the other muscles before diving back into it, alternating between that and the more sensual pleasure.

"Better?" he hums, a little teasing but undeniably warm, pleased with how he feels the reaction beneath his hands. This really should become a regular thing; maybe he'll kidnap Gustavain for a day at a time to make sure he gets some godsdamn rest...