"Good night, my Hero, hehe!"
He kissed his cheek, nuzzling back into him, falling asleep
(Oki...so I was thinking incubus x sweet/super innocent person-but we talking like-fairytale princess levels, birds fluttering around their head, flowers in their hair levels of innocence. Which makes them like the crème de la crème for succubae and incubi, who-y'know, are LITERAL sex demons feeding off of human's energy by entering their dreams and fucking them in their sleep/giving them sex dreams I shit you not that's what an incubi/succubae is because Christians really will say the weirdest shit to keep people abstinent/terrified of their own bodies-ok I'm sorry ignore my little tangent-
So the incubus starts visiting this person like almost every night-because this dude is a literal snacc. But because this person is like-crème de la crème, other incubi and succubae start to take notice of them, meaning the incubi now has competitors. So the incubi gets upset cuz he's greedy and wants this person all for himself, and decides that the best solution is to disguise himself as a human and reveal himself to this person in real life, more or less getting them to fall for him. Because at that point it'd be easier to fend the other demons off, and he'd get to fuck them in person and not just in the dreams while they're asleep. And it starts out as him just like wanting a guud meal, but he actually ends up falling for the person along the way, and like it kinda becomes a problem cuz A. they're whole relationship is built on lies and B. he's basically killing this person and C. Other demon. That's it :)
Timeskib?