My stunning girlfriend's curvy stepsister pleasures herself while I reveal my manhood to her

I've been harboring a secret crush on my girlfriend's stunning stepsister for quite some time now. Every time we're alone at home, I can't help but find myself drawn to her irresistible allure. Her luscious curves and breathtaking beauty are simply too much to resist. One fateful day, I found myself alone with her yet again, and I couldn't resist the urge to reveal my throbbing manhood. As I unzipped my pants, her eyes widened in surprise and excitement. Unable to resist the sight, her fingers began to wander, exploring her own blossoming desires. Her beautiful body came to life as she pleasured herself, her lips aching for my touch. The sight of her stunning form, her big tits and curvy ass, was enough to drive me wild. I couldn't resist the urge to join her, our bodies entwining in a passionate embrace. Our shared pleasure was palpable, our moans echoing through the empty room.