Ayako had a stronger sexual desire than most people. Even though she is now in her fifties, she still has sex with her husband at night, but she is not satisfied with just one time and begs for more. However, her husband has recently become weaker, and she is feeling frustrated. Her son is secretly spying on his parents. One day, feeling horny, Ayako invites a delivery man into her house and cheats on him. Her son is watching them, too, and taking pictures of them on his phone. After the delivery man leaves, the son shows Ayako his phone. He then orders her to suck his dick if she wants his mother to keep quiet...