Rin's mother has a strong libido. But my father is light night. That's why my mom is always frustrated. Yosuke was aware of his mother's suffering, but pretended not to see that his son could not do anything about it. However, when Rin is masturbating, he sees a lonely expression and decides his heart. I will comfort my mother ... It was Yosuke's kindness. Rin accepts his child only once. However, Yosuke, who has drawn the blood of Rin, is so unequaled that he makes Rin go crazy.
