After witnessing her busty older sister, whose younger brother had just been dumped, imparting her techniques of "simulated orgasms that will definitely bring women to climax" and "sex that will absolutely make women feel good," she unexpectedly became overly skilled and indulged in incestuous sex. (Yayoi Mizuki LULU-202)

Yayoi Mizuki (the older sister), with a lewdness deviation score of 72, gently teaches her younger brother, who is heartbroken after being dumped, how to make women feel good through sex. This includes techniques for pleasurable kissing, the structure of the vagina, licking the genitals for a realistic orgasm, and thrusting techniques that facilitate vaginal orgasm…