Hi there,
After a brief consideration of your description, I think I may know of the story you are referring to. It may be the first part of a wider trilogy titled
"The Succubus Bride" by Reif of Fictionmania which, if I recall correctly, contains the points you listed previously. A link is below to the relevant part, which I hope answers your request

.
https://fictionmania.tv/stories/read...02925641537789
Thanks,
Alchemical Night.