The noises he's making are incredible. She's never heard him sound like that - so needy and emotional and uninhibited. She could get addicted to those sounds.

It's the loudest ones though that catch her attention and tell her what he likes. She hears the difference and keeps doing exactly what he was responding to the most except that she speeds up even more, knowing he's close.

"Come Sherlock," she says in response to him. "Come for me. Right now."

Her eyes are open and watching his face. It's already got the most beautiful look of pleasure and pain on it.