Yura, who has been married to a man with a stepson for two months. Although her relationship with her husband is harmonious, she struggles to build a bond with her stepson Tomoya. One day, Tomoya, who has an excessively strong sex drive, asks Yura to help him masturbate... Overwhelmed by the joy of being called 'mother' for the first time, Yura helps her son release his tension as a mother would. However, Tomoya does not stop at one ejaculation and repeatedly asks Yura for help whenever he finds an opportunity. Initially, Yura cannot refuse and goes along with it, but eventually, she starts to offer her assistance on her own.
