One day, my son brought his friend Kousuke. Her mother, Mariko, who was bored with her everyday life, happened to see his erect penis and became lustful and decided to eat it to kill time... No matter how many times she fucked him, she couldn't resist his unparalleled love, and she continued to be fucked countless times. Since then, Kousuke has become obsessed with her exuding adult charm, and from that day on, he visits her almost every day. However, Mariko, who felt the limit of his bottomless sexual desire, finally...