Fic: Dirty Pretty Things (Dean/Castiel/Sam, NC-17)

Uh.

Title: Dirty Pretty Things
Rating: NC-17
Pairing: Dean/Castiel/Sam
Words: ~4,500
Notes: Um. So, once upon a time, my friend cautionzombies wrote an epic D/C AU, 300 Things. Lots of people loved this fic, but I am probably the only person who both a) loved this fic and b) also kinda sorta shipped her Sam/Dean in it, too. (I'm a bad person.) I mentioned this to Jen, and, because she is indulgent, she wrote me half a Sam/Dean ficlet set in her 'verse in the indeterminate college!Sam future. And then, because I am a bad person, I wrote her filthy dirty threesome porn back. So, yep, this is an AU of an AU, kinda sorta springing from a fic that never got posted. */o\* I have on good authority that there is a sequel to 300 Things in the works, which will not feature any brotherfucking, BUT I FIXED THAT FOR YOU, JEN. fjgbkjdgbfg I'll shut up now. Jen, I ♥ you for letting me do this. ;) And thank you, annundriel, for looking it over for me. ♥
Summary, non-tl;dr version: This is the best idea Castiel's ever had. Technically, it's set in someone else's AU, but essentially it's just dirty threesome porn with human!Cas, so, you know. :)

( There's sweat in the hollow of Dean's clavicle, a sheen of it breaking out all over his skin )