By now, Sherlock's practically on autopilot. Even after all this time, his body still so effortlessly takes over to lead this familiar but almost-forgotten dance.

He buries his face in Jim's neck, still not entirely sure what he wants from the man. All he knows at this point is that whatever he wants to do with Jim, it's something he should not be doing.

Somehow, that makes him want to do it even more.

A small shift of weight changes pressure and adds friction suddenly. Oh, yes. That's what he wants.