While their new home is being completed, an adult daughter and her husband Kento temporarily move in with her parents. The atmosphere turns tense as the father pressures the busy young couple to have a baby. One day, Kento confides in his mother-in-law that his enormous cock has left him and her daughter in a sexless marriage. When he shows her a cock far bigger than she imagined, she gives in to desire and lets her son-in-law pound her deep, betraying her role as a mother.