Nunsol

The leader of the Villains' Alliance, Lexion, and Korea's hero, Yu Sena, became husband and wife. The story of how she "moved" the villain leader with love and brought the alliance to collapse became a worldwide headline. But no one would know the truth. "If I had her pinned beneath me and drove my cock into her... would she cry like that?" What Lexion's ability truly was—not even his wife, and former hero Yu Sena, knew. Original Webtoon: Ridibooks

Hella is cursed to lose her magic if she doesn't engage in a sexual relationship. As she feels her magical powers gradually wane, she decides to move to a quiet village. There, she encounters a young man named Calvin, who has nowhere else to go, and they decide to live together.