Gargoyle

Encyclopedia Entry:
A stone statue animated by a demonic soul. Normally the statue is sealed to its pedestal by a sacred chain, and can’t move around very much.

However, if the pedestal is damaged, the seal becomes undone. Then she can spread her giant wings and fly free, looking for human men to feed from. When she finds a target, she swoops down and has sex with him.

A gargoyle can only move around at night. When dawn breaks she changes back into a stone statue. If she is coupling with a captive when that happens, the man will also turn to stone until evening. If the gargoyle is in a woman-on-top position (which many of them favor), her partner will literally become a pedestal when the sun rises.