A popular series of amateur male and female monitoring projects. This time, strangers of the opposite sex challenge the 'naked thigh' method! If an experienced older sister teaches a virgin boy things like 'deep kiss,' 'cunnilingus,' 'fellatio,' '69,' 'handjob,' 'boobjob,' and more, for each lewd act completed, he will be awarded a prize of 100,000 yen! However, 'naked thigh' is mandatory! The virgin boy, excited for his first time, ends up continuously ejaculating. Seeing such a naive performance, the older sister gets excited and proceeds with live insertion and continuous live ejaculation!?
