As he sat next to his step-sister watching a movie, he couldn't help but notice his growing erection. She looked at him and smirked, knowing she had that effect on him. As the scenes on screen got hotter and steamier, they both began to explore each other's bodies, succumbing to their forbidden desires. Their moans of pleasure were drowned out by the sounds of the movie, but they knew that this was the only time they could indulge in their taboo lust