Another Night At St Bart's

Molly can't sleep. The thought of doing nothing but lying awake all night is horrible so she makes her way to work. Of course. But there is someone there waiting for her. Someone that she didn't need to see right now but someone that she can never help but want to see. Fits with original story arc. First chapter set after 3x02, second set after 3x03. Spoilers for all of series 3.