A younger sister decides to become a girl. When I became a girl, I had to practice sex because I was ashamed! The person chosen as the opponent is my brother! I watch AV, but I don't have any practical experience... But when "that day" comes, I will be very embarrassed if I can't do well. Perhaps because they share the same bloodline, their compatibility is super excellent! It is inherited with all places unequally! Even if you don't notice that each other is going backwards, you'll have a massive chase with a W's escape piston!