To teach me how to fuck - Ichika Hoshimiya

Ichika is very good at work but extremely sloppy at home. She usually doesn't wear pants, only wears underwear, making her younger brother unable to take his eyes off her beautiful butt. Knowing that her cute younger brother is still inexperienced and craving her butt, Ichika wants to help him get rid of his inexperience. So Ichika constantly uses her seductive butt to entice her younger brother, and he quickly surrenders to her beauty.

And so, her younger brother's inexperienced life is officially taken away by his beautiful older sister. After that, the two sisters "play around" with each other every day. They both promise that even if her younger brother has a girlfriend, he will continue to be "intimate" with Ichika as he is now...