This live-action adaptation of Benkei Natsume's popular incest series follows a strict mother who takes responsibility for relieving her adult son's urges so he will focus on studying. As long as he obeys her rules, he can fuck and creampie her almost every day. At first she hides her face, suppresses her moans, and allows only doggy style, treating it as a chore. But her virile son's relentless pounding and repeated creampies make her feel more than she intended, and she gradually becomes shamelessly aroused. Soon she actively dominates him and, after cumming again and again, allows positions far beyond their original arrangement.