My little sister decided to become a gal. Once she becomes a gal, she has to be flirty, so she decided to practice sex! The partner she chose was me, her older brother! I watch adult videos, but I have no experience in practice... but when "that day" comes, I'll be embarrassed if I don't do it well, and I have my dignity as an older brother, so we practice pistoning together! Maybe because we're related by blood, we get along great! We both inherited our sexual prowess! Even when the flow of fluids comes back without us realizing that we're both cumming, we still keep going wild with the pistons and cum inside of each other!