True and abnormal sexual intercourse

Housewife's life with husband and son. There was an article that the female hormone was activated by sex in the magazine read. It is sex to invite the husband after a long time to regain the woman. The son who peeped at it will be devoted to the next morning. Son to hide pants. He finds a son with semen in cleaning. That night, Kaori says to his son, "don't be regular, you're bad for your health". He was asked by his son, and he was only a hand at first, but he was a little bit away.