It's not that much deeper than before, but her pulling him just that little bit further into her mouth draws a harsh gasp from him. His head drops back for a moment as she looks up at him, and he moans, one of those long low rumbling sounds he can't seem to control.

He shifts a bit, squirming to shift his legs wider apart, head lifting again so he can keep watching her. Again his fingers curl and uncurl in her hair. His mouth opens and closes several times as he searches for something to say and can only fish up more wordless noises of approval.

Distantly he knows this won't take long at all. Sherlock might be more self-conscious about that if Molly wasn't sucking all his higher brain functions out of him through his cock right now.