JUL-691 Maiko Ayase is invited by her mother-in-law who wants her son-in-law's big dick all the time.

Maiko, a mother, lives with her daughter and her husband, who was worried about her husband living alone. - On the surface, their relationship was good and there were no problems, but his frustration built up and he indulged in masturbation every night. - Then, her son-in-law, Hikaru, secretly peeks at her naughty behavior... - When Maiko learned that he had a big dick, she couldn't control her overflowing lust and seduced him obscenely at every opportunity. - The son-in-law, whose big cock swells due to his mother-in-law's repeated lewd behavior, can't stand it anymore...