The Toda family consists of a husband, wife, and mother-in-law living together. One day, the mother-in-law, Emi, accidentally buys a sex cream instead of a beauty cream. Once you buy something, you can't help but want to use it. Applying the cream to her private parts increases her sensitivity, making it impossible to control her lust. With her daughter away, she figures it's okay... She takes her stepson's cock in her mouth and guides him into her own mature pussy. Unable to resist the allure of her cute and sexy body, her stepson cums inside her. This unprecedented pleasure... The two of them, unable to forget this feeling, keep having sex over and over again.