Shihori has been living with her daughter and son-in-law for the past six months. Every night, she hears the sounds of her daughter and son-in-law having sex, which makes her body hot and she starts to use it to comfort herself. One day after dinner, Shihori falls asleep in the living room and her daughter and son-in-law start having sex. Shihori wakes up, but feels awkward so she pretends to be asleep. After everything is over and her daughter falls asleep, her husband reaches out to her body and asks, "Are you awake, mother-in-law?" She ends up accepting his advances. After that, she refuses him, knowing it's wrong, but instead she begins to crave his penis...