Even when her son is at home, the stepmother Yu engages in lewd sex with her father-in-law from daytime. This was enough to make the NEET Yoshihiko erect. As these incidents piled up, Yoshihiko began to see Yu as a 'woman'. Noticing this, the highly libidinous Yu accepted her stepson, and finally, the two... Since then, even when his father is at home, the son seeks out his mother's body, and they go at it from morning till...
