My daughter brought her boyfriend. Kaori congratulates the two of them, but as her mother, she decides to stick her nails in the hands of the young boy. ``Make sure to use birth control.'' Up until this point, I had said what I was supposed to do as a parent. However, Kaori's actions, which naive boys love, gradually go beyond the scope of her parents. Have you not had sex with your girlfriend's daughter yet? Maybe she's a virgin? Her boyfriend is irritated as he gets to her core. Kaori's naive reaction suppressed her estrus.