The Benefits of Friendship

Sherlock happens upon Molly's (only sort of) secret, friends with benefits relationship with her ex-fiancé. He's not happy. When he sees Tom out with a new girl, he jumps at the opportunity, offering Molly himself as a replacement. Will Molly take him up on his offer for casual sex? (that may be the stupidest question I've ever typed!) This one is a two-parter!