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Her younger sister Ria is a beautiful girl with long, slender arms and legs, but a bit of a natural. One day while she was taking a nap, she saw Ria wearing a panty, and even though she knew she shouldn't, she couldn't resist looking at it. When she wakes up, Ria whispers to her with a smile, "Do you like to look at underpants? The next day, I took advantage of the fact that she was out of town and was seduced by her for three days.