A man stumbles upon the territory or catches the attention of a demi-human, they get friendly and they start hooking up, with the two of them getting hooked on the idea of having sex with each other that they either decide to stay together or start seeing each other.

Open to other kinks you want to add. Was thinking on the lines of yuki-onna or the snow queen, but I can go a bit more monstrous than that if you have any ideas. No live-action or iconless. PM me if you're interested.