Lris, who has just turned 18, is masturbating in her bedroom for the first time when her older sister, Lila, unexpectedly catches her in the act. To her horror, Lila turns out to be quite interested in her younger sister and decides to personally show her how to pleasure herself. With her sister’s guidance, Lris begins to really enjoy herself. Unexpectedly, their activities are discovered by their mother, Sylvia, who happens to be passing by…