'Even if it takes the rest of my life..' - Sherlock fanfiction

A year after the Fall. A year after the suicide. A year after saying goodbye. But now, it's time for Sherlock to come back. He's been keeping a low profile, he's gone through every precaution to ensure the safety of his dearest, so all that is left to do is return to Baker Street. But will it be as simple as he hopes? There are a thousand doubts planted in his mind, to the point where he feels he is going insane. Does anybody even want him back? Despite all this, there is one thing Sherlock Holmes is positive of. He will spend the rest of life fighting for forgiveness. { Mentions of drug use. }