This Time Around

What if things went very differently on that fateful full moon at the end of Harry's third year? What if Peter Pettigrew did not escape and Remus Lupin got his wolfsbane potion? What if all it took was someone who wasn't there the first time? (Self-Gratuitous fix-it-fic) "900 years of time and space and I've never met someone who wasn't important." – Doctor Who.