Hmm....here are a few of mine.
Getting ganged banged roughly...think Cody Lane in the blue room but with condoms and no coercion. If you are unfamiliar with the scene go google it.
Being bound then shared without my consent. (Just a fantasy, do NOT try to pull this on me without prior discussion and agreement.)
Playing as a guy's "pimp" and renting out his virgin mouth and ass to TS girls*. Bonus if the guy gets to lick my juices from the girls balls from the pounding I received. Dressing him up and making him "stroll" just to humiliate him....I wouldn't share my sweet thing unless I also get to play or watch.
Queening a guy while a line of guys use my mouth...I'd spit the cum out on his body just to further his degradation.
Because of the nature of the hobby and my fantasies themselves I doubt any of these would happen, but they do make the "spank bank" more fun.
*(Aside: If you are bi, pretty, have a little "extra" down there, in SA or travel to here, and have MM's please contact me. Please, I'd like to meet my unicorn.)