Interesting premise. Well told.

I'm really interested in where you're going with this. I always thought that Remus wouldn't have accepted Sirius's supposed betrayal easily. I figured he was so conflicted that he never told anyone about Sirius being an animagi or about the secret passages even after Sirius has been sneaking into the castle. It's really nice to see him doing something about that. Snape is a good addition too. Dumbledore does some pretty questionable stuff and it's nice to see that at least one of the teachers has some questions about it. I'm looking forward to seeing Remus's response to meeting Harry. He needs parents.

great beginning. how you got the two of them in the same room without bloodshed is awesome.

Can't wait to see what happens next!

Great start!
Looking forward to more :)