Very nice. Marriage Licences might have been a bit unnecessary but what the hey, to truly fool people around them.
I think Remus/Sirius is one of the most likely pairings in the Harry Potter-verse, I mean do you _ever_ hear about Sirius having someone in his life? Or Remus either for that matter? Only the cradle-robbing Remus/Tonks shudders
Anyway, great stuff! It all makes a lot of sense to me, and I'm really looking forward to more.