Um...not sure what exactly you're looking for since I pretty much love the kink, but some of my favs are:

Completely Pleased Sam/Cas - Pre-come kink/dirty talk
Except Thou Bless Me Cas/Dean - Heavy S/M
The Air Moves In to Fill the Spaces Where My Body's Been Sam/Dean - I'm not sure what I can say except holycrapthehottestthingeverwritten. Come play,I guess.
Untitled Prison Sex Pornlet Sam/Dean - prison sex, really aggressive Sam, in public

And some of my favorite porny authors (in no particular order and some are friends' only):
annabeth - masterlist
atimi - masterlist but the kinky stuff is over here at telete
rivers_bend - masterlist

There's lots more, but that should set you up good for now.