I started writing a short story that involved demonic possession. The nature of the possession is symbolic. The story is an allegory. When I shared the initial draft among some friends, I had feedback that included some questions about which plane the demon came from, and some criticisms about the mechanics of the possession.
The demons and mechanics of demon magic are based on the symbolism I want the story to use, not any particular mythology. I know that not everyone will love my writing, and some people won't get the allegory, but how can I help the reader understand at the beginning of the story that I am not writing fanfic?
I don't include other fantasy elements and I'm not riffing on any particular construct. The allegory is about how we allow our desires to possess us, only in this case, the desires are 'personified'.