Usotsuki Sensei to Emono na Watashi

Synopsis

Ameya is a sensible high school girl who has multiple part-time jobs to help out with her family's finances. One day, the principal gives her an offer too good to refuse—he'll double her scholarship if she just provides a certain teacher with a meal once a week. The catch is—Kairi-sensei is literally a demon, and his 'meal' is Ameya's touch! (Source: MangaDex)