The son, who was at an age where he was living a frustrating life, had even begun to use his mother as a wank. One time he would masturbate by smelling his mother's underwear that she had taken off, and another time he would masturbate by peeking into the bathroom... The son, who had been living like this, had even begun to fantasize about forbidden acts with his mother. And when they got into the bath together, he finally couldn't hold himself back...