After the son ejaculates inside her, he uses oral sex to force an erection and then penetrates her again, resulting in endless incestuous sex. (Satsuki Mei VENX-068)

As Satsuki Mei ages, her increasing libido troubles her. Her disharmony in their sex life further angers him. One day, frustrated by her unfulfilled desires, she sees her son's erect penis and, unable to resist, assaults him…