Beloved Demon by Luke Thunder
"Demons" occur in many different variants in the literature. The most popular at the moment are of course the sex demons, which are traditionally called "succubus" and "incubus".
"Succubus" — from the Latin "succubare" = to lie beneath — is the female form, supernaturally beautiful, desirable and irresistible. In this form, the demon collects male sperm in order to then pass it on to unsuspecting women in the male form "Incubus" - of course also supernaturally beautiful, desirable and irresistible - and thereby reproduce itself.