That sound draws a chuckle from him as well - he hears it so rarely and always does his damndest to commit it to memory. Moments when Lenny is relaxed and content with him.

He hums into the kiss, hand light on the back of his neck. Lenny doesn't have to say it. He doesn't have to say anything because Mick knows. He shows it in every careful touch, in every little smile that's only for him, in the ways that he lets Mick take care of him.