Mio remarried to build a happy family, but soon after her remarriage, she was taken by her stepson Atsushi. Every time her husband went on a business trip, they would have an affair. However, Atsushi's demands gradually escalated. One day, while her father was drunk and asleep beside him, Atsushi forcefully molested his stepmother, and Mio herself became engulfed in that lewd pleasure. On another day, as her husband entered the bath, she performed fellatio on command... transforming into Atsushi's sex slave. Then, while her father was away on a business trip, Atsushi brought friends home to have sex with his stepmother. After savoring the sight of his stepmother writhing in internal ejaculation sex with his friend, Atsushi joined in himself…
