Mio is a married woman who has just given birth and is busy raising her child. She was surrounded by a warm family and spent her days happily. However, since she became a mother, her husband and I no longer have sex, and she is frustrated. Mio, who is in the prime of her life and is bored with her body, is not overlooked by her father-in-law who lives with her... One day, when her husband is away, she is seduced by his skillful speech and aggressiveness and loses her postpartum virginity to him. His huge cock is forced into her narrowed vagina, and her body becomes so sensitive that she repeatedly climaxes in convulsions. She is implanted with the intense pleasure of climaxing for a long time...