I didn't write this but I have been given permission to post this all credit goes to Valentinesdaygreen and a link below to the original story origin http://valentinesdaygreen.deviantart.com/
(Y/N) (L/N) works for Mycroft Holmes and has for years, but when Mycroft's brother, Sherlock, fakes his suicide, Mycroft needs someone to take his place. He decides there is no one better than (Y/N) who has nearly identical abilities to his little brother, but is she up for the task of replacing the famous consulting...