To-an-extent Geschichten

Over his countless years as Master of Death, Harry Potter has grown tired of the stupidity of most muggles and their perceived need to know everything and or destroy whatever they can't hope to comprehend. He decides to take death up on the offer of a new start. Now, as Septimus Snape older twin brother of Severus Snape, how will he change the past, or should I say the future?