My sister and her friends are curious as a teenager and watch a naughty DVD and a book in my brother's room. - A shocking image to see for the first time. - Dirty music enters the hearts of women. - Beginning with a soft kiss, taste each other's local parts and experience the first climax. - Suddenly, with the appearance of her brother, she slams sex education into her sisters who are obsessed with pleasure. - Her sister's complicated thoughts lose to pleasure and approach her brother with her emotions exposed.