Recently, my son's appearance is strange. He says he is studying in a room, but he doesn't let him in the room even if he calls out. Mother Sachiko is worried and sneaks into her son's room. Then there is one erotic book in Soko. When I ask my son, he says, "I've been sick recently and can't concentrate on my studies." Sachiko, who was surprised but noticed her son's sexual desire, reached out to her son's crotch, saying, "OK, leave it to my mother."