My sister decided to become a gal. Once she becomes one, she has to be flirty, so she starts practicing sex! And the partner chosen for this is me, her brother! I've watched AVs, but I don't have any practical experience either... But if I can't do it right on 'that day,' it'll be embarrassing, and I need to maintain my dignity as a brother. So, we practice piston movements together! Maybe because of our blood relation, our compatibility is superb! We're both incredibly virile; it must be genetic! Without realizing that the other has already climaxed, we continue with reverse flow and double rampant pistoning, culminating in a massive internal ejaculation!
