Okay, first for all, thank you so much for this wonderful gift! I wasn't expecting anything like this (although with Beholder, one never knows what to expect, so I guess that's good XD) and it was a wonderful surprise.
I absolutely loved your Sirius here -- he was just note-perfect and so much fun to read. I loved your James, Peter and Remus here too, plus the other cameos like Caradoc Dearborn. The whole side-story of Petunia's wedding, and Sirius's 'wishes' for James were just too funny...and I love that they came true (sorta).
Rosmerta was lovely here, and her relationship with Sirius was just wonderful. The sex was hot as hell, and I freely admit I have a great love for wall!sex and knee-tremblers. *fans self*