In this adult sibling role-play, I am still a virgin after failing during my first attempt at sex with my girlfriend. My kind, busty sister offers her body so I can practice, but insists on rubbing between her thighs because my first real penetration should be with the woman I love. As we rub together, her pussy becomes wetter and I can no longer resist moving my hips. I accidentally slip inside without a condom and cum in her. Instead of getting angry, she cums wildly while keeping me buried inside for three consecutive creampies.