A shocking experience as a home tutor for sisters from an all-girls school. The younger sister, who had started to be interested in sex, unexpectedly practices kissing. The stairs to adulthood continue, evolving into a small-breasted groping H game. It naturally progresses to insertion. The older sister, who had been watching secretly, doesn't want to be left behind and begs me for sex education. After secretly making her ingest an aphrodisiac and giving her kiss training, the shy big sister transformed into a slut.
