Okusama no Kaifuku Jutsu The Animation - 1

Shion, a boy who cannot show his magical abilities even after reaching adulthood, was left to the care of a family specializing in magical research. An experienced healer named Ruya, who promises to teach him how to manage on his own. But in order to handle magic correctly, the guy needs deep knowledge in the field of sex.
Therefore, the rui decides to go against his marriage vows and deprive the Shion of virginity, while teaching him how to correctly satisfy the woman. At least until he learns to control his magical abilities ...