Hmmm, had to think about this one, lol. This is pretty opposite of my normal tendencies since I normally like to receive/dominate and I'm terrified of std's/pregnancy.
I think my kinkiest fantasy would be one involving 2 hard-bodied, large (not huge) cocked guys. One is fucking me doggystyle from behind while I'm giving the other a blowjob in the front. The one in the back starts by rubbing his dick all over my pussy and anus before pounding me in either hole and switching back and forth...the one in front might push my head (not too hard) into his dick...and at some point the 2 guys will acknowledge each other with a high five or something. After I get the guy in front off, the one in back lifts me up straight to his chest and he's grabbing my tits while still pounding me hard and fast...then I bend back over and the guy will cum inside my pussy and shot some cum in my ass.
This fantasy can be modified by adding another guy (below me) so I'm double penetrated or by replacing the front guy with a girl so I'm eating her pussy while being pounded from behind.
I guess my fantasy is feeling like a "slut"