Well, that was just perfectly delicious...and I don't mean just the sex. Snape and Black are so IC that it's easy to imagine this is canon. Especially that last line. God. That was perfect. I read it twice to actually make sure that's what it said. And then I just had a melt down, basically, because really...that was just a brilliant way to tie it into canon. Marvelous fic.
Oh, and the sex was...mmmm...*points to icon*
LD7