Mio remarried in the hopes of building a happy family. However, soon after her remarriage, she was seduced by her stepson Atsushi, and they would have affairs whenever her husband was away on a business trip. However, Atsushi's demands gradually escalated. One day, while her father was sleeping drunk, Atsushi forcibly played with his stepmother's body, and Mio also became immersed in the lustful pleasure. On another day, behind the door of the bathroom where her husband was bathing, Mio gave him a blowjob as he told her to... and became Atsushi's sex slave. Then, while his father was away on a business trip, Atsushi invited his friend over to have sex with his stepmother. Atsushi enjoyed watching her writhe in agony during creampie sex with his friend, and he joined the group himself...