She looks like a child, but her body is that of an adult! Her younger sister, Mao-chan, is still developing her H-cup breasts. Her knowledge about sex is practically nonexistent, and she still wears cotton panties. But her interest in naughty things she recently discovered won't quit! With her limited knowledge, she teases her older sister's boyfriend with her panty flash! The prominent stain on her kiddie panties is adult juice?! Filled with the pheromones of a 20-year-old, her first experience is a reverse cowgirl sex session driven by instinct! She has sex in the sexy lingerie she bought after realizing she's attractive, and now she's officially part of the naughty adult club!
