Damaged

Post-Reichenbach. Sherlock has been away for three years (John has not met Mary at all) and visits the cemetery whenever John is there at his gravestone, hiding behind a tree of course. One day when John says some horrific things, Sherlock decides to reveal he is still alive.
WARNING! LOTS OF FEELS!
Also, later chapters may have some NSFW content in them. Not many of them are, but there will be a few. I will put a warning at the top of those chapters before you read them. YOU HAVE BEEN WARNED!