My older brother, who recently made her gal debut, chose to practice sex. ■The Two W-Floating Pistons with Less Knowledge of Sex, Sumitre Kuramoto

A sister who decided to become a gal. I decided to practice sex if I had to get into a gal chopsticks! My brother was chosen as the opponent! i'm watching an av, but i don't have any practical experience... However, I am embarrassed that I can not do well when "the day" comes, and there is also the dignity of my brother and sister and practice piston! Maybe it is because of blood relationship, the compatibility is super bad! It is genetic that there are also places where extermination is not! Even if you do not notice each other and flow backwards, you will be in pursuit of a large amount with W runaway piston!