From the journal of valis2: I do remember that I was in a bookstore in some city, maybe it was WA, and I picked up a book about Harry Potter, and it mentioned that Sirius Black was the staunch support system for Harry (well, for that one year, I suppose), and that he was an Anamagnus.

You can get anything publish now it seems. Although substituting "brother" for "lover" is quite a big error. ;)