Harry Potter: Heart Of A Mystic Soul
59 parts Ongoing Sirius Black is the father of all godfathers and he will do anything to prove it. He knows that his godson needs him and no one is going to stop him. Not even the leader of the Order of Fried Chickens himself. Sirius is done being pushed around and decides to step up and be the godfather James would have wanted him to be.
And if he has to team up with an entire school of magic-users known to hate wand-using wizards, then so be it.
(I do not own Harry Potter, no matter how much I want to. This is a different version of my Raised By Roses story.)