Angel's Fall: Hellspawn, I'm Your Great-Grandma!

[Mutual hatred + feigned civility + reunion after a long separation + rekindled romance + marriage before love + coercive possession + both leads pure + Western fantasy]

[Alluring, useless angel × scheming overlord of Hell]

A timid little angel who’s a complete pushover is hiding from one fight after another when, for no apparent reason, she’s saddled with a grave sin and forced to embark on a journey to Hell.

She’s fragile, innocent, and so pitiful that the monsters ought to chew her up and leave not even a scrap behind.

But there’s no helping it: the big shots from every corner are all captivated by her. They dote on her, protect her, support her, lift her up… and willingly fall at her feet.

And there’s more: I hear Hell is overrun with wickedness? No problem. I’ll blow up the dungeons, set the slaves free, kill the evil spirits, seize the Demon Queen’s throne, and set things right. Just a little something I can do along the way.

…

The first time they met, he robbed her of everything and warned her that they had nothing to do with each other.

The second time, he held a sword to her throat.

The third time, he threatened her into handing over her treasures.

Fine! He’d better be ready!

With the resolve to burn together, she was determined to train this bloodthirsty, brutal madman until he obeyed her completely.