The mother of a friend - the final chapter - Kako Oikawa

As he grew older, Satokako couldn't control the increasing desire for sexuality and lived every day immersing herself in a masturbation at night. It was Nobuaki, a friend of his son, who smelled such frustration. When I came to stay at home, I looked in secret at Rikako's daily routine. That night, Nobuaki, who had a sluggish laugh, spoke at the ear of Satoko. "You took a picture of her masturbating, didn't you? do you want me to turn it off? then what should i do... You know what I mean?"