Heterosexual Romance

Incubus is given a male target so he turns into a woman and likes it more than he expected.

Oneshot about an office lady who attracts an incubus with her steamy fantasies that he wants to eat, then falls in love with him.
No trigger warnings.

Girl gets dumped for being bad in bed, makes a contract to learn from an incubus.

Oneshot, incubus pretends to be a woman's younger brother and she thinks she's having inappropriate dreams. He looks very young, so along with the incest themes, this is bound to make some people very uncomfortable.
Trigger warnings: incest themes, shotacon.

Everyone Yoshino loves is dead, so she summons Belial to take care of her, and since she's still underage, he puts off having sex with her as payment for now. This is a weird parent/child type relationship but the parent is also a demon. I had to stop reading when he started torturing her human crush in his dreams and encouraging him to commit suicide.

Demon possesses a dead woman and gets mixed up with a traveling priest.

Alt title: The Charming Gentleman Is Actually A Demon? - His Addictive Touch Is Blowing My Mind

Isekaied girl is constantly raped as the saintess because her party members say she doesn't contribute, so the demon king ends up saving her.

Demon king comes to destroy the reincarnated saint, but her life already sucks so bad he says he'll make her happy first, then plunge her into despair.

Demon king seduces the saint who gives power through sex.