I think I'm covering every possible pairing you can make from those four, plus solo and group. It's kind of scary, and for all that it's sexual, it's not NC-17 at the moment.
I still support all of these fics! Yes. Don't be scared. You are a woman confident in her porn skillz! (I have two words for you: awesome foursome.) I will definitely read them all and comment. And be very happy.

Vive la porn!