Ichika is very good at work but very sloppy at home. He often doesn't wear pants, only underwear, making his little sister unable to take her eyes off his beautiful butt. Knowing that his cute little brother is still a virgin and desires his butt, Ichika immediately wants to help him get rid of his virginity. So Ichika repeatedly uses her butt to seduce her little brother, and the little brother quickly succumbs to her beauty. And so, his virginity is officially stolen by his beautiful older sister. After that, both sisters “play” with each other every day. Both of them promise that even if he has a girlfriend, he will continue to “be close” to Ichika like now…