What I like most about it is that the characters aren't OOC. Sirius is still the Sirius hinted at in the books; sure, he's dark, but there was always that edge to him. It's like moving the torch to a different angle so that the shadows each person casts are altered.

And that's about as much poetic critique you're likely to get out of me with the flu. I can say, though, that I really did enjoy this, and I'm glad you're proud of it.