Her younger sister Noria is a slender beautiful girl with long limbs, but she is a little natural. - One day, while she was taking a nap, Ria-chan was panty-skimming and she couldn't help but be fascinated by it, even though she knew it was wrong. - Then she woke up and Ria-chan smiled and whispered, ``Do you like to see my panties?'' From the next day, she took advantage of her absence and seduced her for three days.