With her husband away on a long-term job assignment, Ai lives with her daughter and son-in-law. Life is peaceful, but she masturbates every day to ease the loneliness of her husband's absence. One day, she realizes her son-in-law Ichiro has been peeping at her. Instead of stopping him, she becomes fixated on his huge cock and starts wishing he would use it on her. When she learns that he and her daughter have a sexless marriage, she flaunts her K-cup breasts and seductively tempts him day and night...