It's surely going to be an admirable effort, anyway.

For his part, Mithrun doesn't show much reaction so far; the stimulation is bound to bring more bloodflow to his dick, bit by bit, but his expression stays much the same.

He nods at Sylvain's suggestion. Though it doesn't really matter to him in this case, he does remember liking the pull of fingers in his hair, himself, back when he cared (though he could get a bit picky about the risk of breakage). So he sets a hand on Sylvain's head.

...Of course, he doesn't have much reason to pull right now, so it's really more like he's petting him.