What are you guys go-to's for artists in this category? Some of my favorites are:
demimond23 (nearly always anal, often multiple insertions)
valmar (anal only loving girls)
saneaz + ike_marshall (furry art, but main focus is anal)
These have lots of content on rule34, so go check them out.
More suggestions are welcome, I'll see if I can update when I find more amazing collections