It's the gasp that does it - the familiar sound of him distinctly getting his way. Even if he's not entirely sure that's what he was going for five minutes ago.

"Good..." he echos, fingers clearing the waistband to find new, unexplored skin to tease.

It's not an electric sizzle, maybe just a slow burn that makes an unexpected knot in his gut with the red flags getting progressively harder to ignore.