Miyuki had just about reached one month since losing her husband. Her emotional wounds remained unhealed, and she spent her days distracting herself through masturbation. By chance, her son witnessed her in the act. Though caught spying, the son honestly confessed his attraction to his mother's ass. Bound by the unbreakable tie of blood, and recognizing that her son shared the same desires as her late husband, Miyuki reluctantly resolved to let him touch her buttocks. This incident rapidly deepened the unexpected relationship between mother and son.