Rei, a mother who enjoys happy days living with her daughter and son-in-law. However, she witnesses her son-in-law Mō using her missing underwear as material for masturbation. It seems the cause is their sexless marriage... Rei, sympathizing with his unused massive dick, says 'I'll help you instead of my daughter' while becoming aroused and seducing Mō. Despite knowing she's his mother-in-law, Mō can't contain his excitement at her lewd behavior and exposes his rock-hard massive dick to her...
