Unable to endure her husband's violence, Ryu escaped to a local hot spring inn with her son Kenji. However, Ryu has always loved Kenji, who protected him from his husband, more than his son. Ryu can't control himself and sucks on Kenji's cock in the room. However, the act was witnessed by the innkeeper. Ryu is forced to give a blowjob as a hush. After that, the mother and child who confirmed each other's feelings sought each other's bodies at the hot springs at night.
