Fumi was diligently cleaning the house as usual. But today was a little different. Her husband had gone on a mahjong trip, and her son Kazuhiko had been called to help out at the family farm. With no one else at home, Fumi let her guard down and began indulging in masturbation using an extra-thick adult vibrator. Unbeknownst to her, Tohru, Kazuhiko's childhood friend, was peeping from the garden. Passing by by chance while killing time, Tohru caught sight of Fumi impaling her pussy with the thick vibrator, writhing lewdly as she drowned in pleasure. His heart racing at the sight, Tohru grew intensely aroused and desperately desired to have sex with Fumi, so he pretended it was a coincidence and stepped into her view.