musesfool, whose rec list was recced you, is also an excellent R/S writer. She has, alas, moved on to Supernatural, but her stuff is classic. Cate does some lovely happy puppy fic. (Ridiculously cute and fluffy, but in the best way.) copperbadge / sam_storyteller's R/S fic is here in case you haven't already found it. Just to warn you, Laocoon's Children 3 languishes in WIP hell. Of course, all of these are fairly major, so you might already have seen them.

I'm pretty sure I have more tucked away on my PC (am currently on laptop) but my flatmate's parents are down there, and I don't fancy trying to explain Harry Potter fanfic to them. :o)