The world of adult butts and thongs has arrived! The one who has come to the family is my cousin Ai Aoi Hoshina, who I've met for the first time in 10 years. She's become a beautiful woman in the 10 years, and she wears only miniskirts, so her panties are amazing. And when all the panties are thongs, I can't stand it anymore... but for some reason she keeps showing me her panties and teasing me. And I finally succumb to the temptation and have sex with my cousin...