Mika is a little sloppy but loves her kind-hearted son, Keita. One day, I accidentally discover an erotic book in Keita's room while cleaning. Mika was upset when she touched the adult part of her son, who she knew for the first time. A few more days later, when I entered the room, I witnessed Keita masturbating with an erotic book. Mika reminds her son that she is a little disappointed, but at that moment her son suddenly changes ... Mika is forced to push the cock that suddenly erected ...