One day, several months after Yutaka, the nephew of Reiko's husband, moved in with the Sawamura family due to his uncle's job transfer, an incident occurred one night. As Reiko got out of the bath and entered the changing room, she found Yutaka sniffing her dirty underwear that she had just taken off. 'What are you doing!' Reiko was shocked, but her forgotten female instincts were ignited by Yutaka's erect penis...
