It's the fantasies that make you unique. What happens in your secret thoughts - the things that you're scared to share with your significant other for fear that they'll give you "the look." The disgusted judgmental look. Or even worse. The look that shows you that they're trying to understand. The want to do this for you, but they just can't manage it.
Disgust and judgment can be turned much more easily than the other. Such an extreme reaction implies fear and isolation. Perhaps you could introduce it to them in stages and they'll convert. But the other? A lost cause.
So what are my fantasies? What do I reserve and share as the Duchess, but shelter from the Princess?
Perhaps the thought that one day I would like to participate in an orgy 0f sorts. I would like to just walk naked into a dark room, lay down on a soft cushioned floor and be open to whomever wished to partake of me.
To have that kind of freedom. Where I don't have to impress or serve anyone. I don't have to worry about ever seeing them again or doing anything other than just taking and giving whatever I chose.
Sometimes I don't want to be an active participant. Sometimes I just want to lay back, be tied up and and feel a hot hard cock just slam into me. I don't want to have to gauge his reactions and adjust accordingly. I don't want to have to contort myself or monitor my teeth to ensure that they don't do more than nip. I want to be utterly selfish and just experience the sensations.
I suspect that's why these will never move beyond the "fantasy" category. Aside from a distinct lack of plush-floored orgy invitations coming my way, I also can't justify being so selfish. Regardless of how primal and animalistic sex can be, I can't imagine ever being so completely consumed by my own wants, that I stop caring about all else.