Matt makes a sound against Sherlock's chest that could almost be pained, if it weren't for the way it trails off into a contented sigh.

He sucks on Sherlock's nipple. He notes peripherally the mess of bruises, but decides he has more or less given up on marking new territory.

(Before it was politeness. Now, with the warmth at his skin, it's especially wonderful to encounter an even-colder spot with his mouth.)

His fingers slide down Sherlock's cock, repositioning beneath the underwear he still hasn't dislodged with total success. They stroke back up.