Well, Dungeon Defense is kinda that but not really an MC..Try the Succubus tag perhaps? Ed: https://www.novelupdates.com/stag/succubus/
Well Maken no Daydreamer has a succubus MC, but he's male and reincarnated Japanese, so I'm not sure how well he'd fit your criteria.
The WN was dropped so the translator dropped it too. Since the Author wanted to re-do the WN or something.