After Sharing a Body with the Demon King

Mei Yushi hadn't come across anything this interesting in a long time. For instance, waking up in prison and being tortured. "You've got some nerve..." He smiled impassively, thinking that once he got out, he'd chop everyone present into mincemeat. But just as he was happily beating up the guards on his own and getting ready to break out, a voice sounded in his mind. "Please don't do that, sir..." Then his consciousness was forced offline.

Huh, so the body's original owner was still around. How very interesting. Mei Yushi smiled just as brightly in his disembodied state, already thinking of how to eliminate the soul fighting him for control of the body once and for all.

Then, after he finally managed to seize control, he instinctively looked down at his reflection in the water...

Whoa! Who's this gorgeous beauty? Damn, I can tell at a glance that this is my long-lost wife!!!

A gentle, beautiful demon with an incubus bloodline and an angel's nature, top × a mad, max-combat-power Demon King who knows how to enjoy himself, bottom

[Content warnings] 1v1, both characters are sexually inexperienced, each other's first love, extremely devoted to each other, a sweet little romance. Western fantasy setting, though not at all rigorous, and most of it is made up. The society where the top lives is based on late Stuart-era Britain, but with steampunk? (Important: The author is bad at history, so please point out any mistakes. If anyone wants to provide historical context, that would be even better.)

!!! More content warnings in the author's note in Chapter 1!!!

Theme: Some smiles conceal a soul gritting its teeth