After giving birth and devoting herself to child-rearing, Mio, a married woman, was surrounded by a warm family and lived happily. However, since becoming a mother, she and her husband no longer shared intimate moments, leaving her sexually frustrated. Her father-in-law, who lived with them, did not overlook this. One day when her husband was away, she was swayed by her father-in-law's skillful persuasion and forcefulness, and he took her postpartum virginity. Her tightened vagina was filled with his enormous penis, and her heightened sensitivity caused her body to repeatedly convulse and climax. She was subjected to intense pleasure for an extended period, leaving her forever imprinted with that overwhelming sensation.