That sound is as good as being touched. He wants both, wants more of all of it. That and the firm hold on his back emboldens him. If he had any less will, he would not be able to break away, but he does, and he wants to be chased. To be told to stay put. To be forced to.

So he breaks the kiss, using his arms to push himself up and away. But there's a grin as he does it, knowledge it will take nothing to beckon him back.