"I need a favour." "Do come in, Sherlock, of course I'm happy to see you, anything I can help you with?" "Yes. I just said, I need a favour." "I was being sarcastic." "Really? Well, I still need a favour. Will you help?" "I don't even know what you want." "I need you to be my girlfriend." {fake dating fic - we pretty much ignore half of series 4}