It all started by chance. When Satoshi went to the bathroom to get soap from his mother Yuko, he witnessed Yuko naked in the bath through a gap in the door. Her dripping wet breasts, her bare skin dyed pink. The image of her overly seductive body was burned into Satoshi's mind and wouldn't go away... And then that night. "I'm sorry, Mom. I just can't help it..." Satoshi said as he groped Yuko's body. Yuko unexpectedly became his daughter's nighttime guest...