Nanako Yoshioka, a mother-in-law who drowns in licking sexual intercourse with her son-in-law who loves cunnilingus

Nanako Yoshioka is a mother-in-law who finds herself in a compromising situation with her son-in-law. Her son-in-law indulges in his favorite pastime of cunnilingus, and she becomes the object of his affection. As they engage in non-stop intercourse, it becomes clear that the son-in-law has a strong desire for oral sex, specifically cunnilingus, and Nanako is more than willing to oblige.