Unaware Masochist: Trained by a Dream Demon to Get Her Heart and Body Devoured

The same night her boyfriend dumps her for not getting into sex, the protagonist encounters an incubus.

"We need to see if you truly can't get into it."

Later that night, he appears in her dreams to humiliate her. Blindfolded and unable to resist, he takes what he wants from her. With her body and mind trained, she awakens as a masochist.

The incubus visits her every night. Some nights the dreams take place in her office, where he ejaculates inside her mercilessly. Other nights he tortures her with sex toys, forcing her to climax multiple times. Even being forced to wear lingerie and pleasure him now brings her pleasure.

Confused by the changes in her body as she's trained in her dreams, the protagonist starts to crave pleasure in the real world. The incubus suggests a contract—one that requires her to become his food for the rest of her life.

"I will devour you all day long." Unable to resist the promise of pleasure, she chooses to be devoured.

Official English:
Coolmic, MangaPlaza, Renta!