Bit of an unlikely request, but here goes: I'd like a het line, playing the female, where a demon of some sort (more the incubus type than any) takes interest in her because of a promise made thousands of years ago up her bloodline. He stakes a claim on her that she isn't entirely interested in honoring and they clash because of it. Permutations are definitely up for discussion; I don't have much really planned out, if you can't tell.