The whole incubus mark thing got me thinking about those stories where it's not just a scar, it’s a tether. I'm rereading an older series where the mark isn't chosen; the victim gets branded after a feeding, and it makes them psychically vulnerable to the incubus. It creates this messed-up power imbalance that’s more about stalking and obsession than romance. The human character can’t sleep, starts seeing shadows, feels a pull they can’t explain—it’s pure psychological horror dressed up as paranormal.
The relationship that develops is super toxic, obviously, but that’s the point. It’s less about seduction and more about violation and the slow erosion of free will. The 'romance,' if you can call it that, comes from the human fighting that pull, trying to sever the connection while the incubus sees them as property. I find those dynamics way more tense than a lot of the flirty, consensual monster romances floating around lately. It leans hard into gothic tradition, the whole 'marked by the beast' idea, which I've always had a soft spot for.
Honestly, it makes the eventual trust, if it ever comes, feel earned against impossible odds, or it just ends in tragedy, which is also a valid take. The mark forces the characters into a cage neither might have chosen, and watching them navigate that prison is the whole story.