I loathe Sirius as a character in much the same way that I loathe James Potter as a character. But I love Remus, and I'm all about what makes the characters I love happy. Sirius seems to have done that, so I do ship them a little bit. And I really disliked the PoA movie when it first came out, but when I re-watched it, it really grew on me.

I've been wanting to read Dumbles/Grindlewald for awhile, but haven't stumbled across any, and you've piqued my interest again!