I'm working on a story that involves a man's inner feminine (in the form of Lilith) taking over his body, dressing him as a woman and going to an ABS to have a massive sperm ingestion session. The twist involves Lilith having the male side think something entirely different happened. My initial impulse was to fit this in Transgender/Crossdressing. However, I don't want it to be interpreted as Lilith being a manifestation of a mental issue (a la Norman Bates). I'm considering slotting it as Erotic Horror, since Lilith is an elemental sort of sexual being. Am I overthinking this?