Honestly, my brain gets stuck on the phrase 'slut princess' because it feels inherently contradictory, which I guess is the whole point. Royalty suggests control, public image, unattainability. Adding that other word flips it completely into a private transgression. The taboo isn't just about sex; it's about a person with ultimate social privilege choosing to debase that symbolically, making her subjects complicit. It's a fantasy of access and inversion.
I've read a few where the 'forbidden' element is negotiated power. She's not a powerless victim; she's leveraging her position to demand extreme acts from guards or ambassadors, creating this tense dynamic where formal protocol and explicit desire collide. The reader's thrill comes from watching her navigate those lines, using her title as both shield and weapon. That control paradox is more gripping to me than pure degradation plots.
Sometimes the fantasy gets way darker, leaning into non-consent or capture scenarios, where the 'princess' title becomes a trophy for the other character. Those stories make me uneasy, but I can see the appeal of stripping that untouchable status away entirely. It's a very specific, raw kind of power play.