I saw a post along these lines recently, and its been in my head this afternoon.
We've been dating for a little while. Im a petite, shy girl who is easily manipulated, and you are a confident, sadistic Dom/Domme. You know I struggle to say 'no' to you. You took full advantage of that, and had an all too easy time convincing me to let you start bringing more and more depraved kinks into our sex life.
You have a friend group who hang out with us, and I've been excited to become a part of the group. However, in one of our hangouts, you casually begin telling them about how you tied me up, hung clamps from my nipples, and fucked my ass. You describe the sounds I made and mimic my expressions. You talk like im not sitting :right beside you.:
Im mortified and frozen in place with humiliation. I expect your friends to come to my defense, but they simply clap, laugh, and tell you "good job."
This continues and soon (either on this visit or another in the future), your friends start to join in humiliating and using me. Maybe the kinks get more extreme as we go.

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Anyway! Thats the gist of it. Open to tweaking this if you have ideas. It can get dark and as fucked up as you want (as long as you respect my limits listed below).
About me: I'm barely 5' tall and 100lb. I have dark wavy hair to my upper back and light olive skin. My tits are D cups, so fairly large for my size and I hold weight in my hips and ass.
Kinks include anal, hole stretching/wrecking, dub/noncon, bdsm, tit and pussy torture, bondage (especially predicament), humiliation, degradation, objectification, TPE, bodymod, object insertions, hucow
My limits are extreme gore, death, needleplay (piercings and bodymod are fine), puke, and scat (forced enemas, laxatives, or diapers for humiliation are good. Just not into scat itself. )
Reddit chat or messages only. If you just want to chat about this and not RP, that's totally fine, too :)