so-I can like-give more of an explanation-
Ok so-the tea with Incubi-The MoThErFuCkInG tEa-is that they basically feed off of people's energies. So they fuck 'em while they're asleep, and steal their energy-and the purer a person, the stronger that energy's gonna be. This registers to the victim as sex dreams, which kinda hooks them on the demon more in a vicious cycle. But because they're feeding off of a person's energy, repeated contact with an incubus can deteriorate a person's health and eventually kill them. MEANINGGGGGG-that if Mr. Incubus over here was to infiltrate the kingdom under the guise of a peaceful marriage alliance and kill their prince, no one would know-it would seem like he'd died of natural causes.