Secretly watching my stepsister's solo playtime turns me on

I've been harboring a secret desire for my stepsister ever since she moved in. Her voluptuous curves and alluring figure are just too much to resist. One fateful day, I found myself in her room, unbeknownst to her, as she began to pleasure herself. The sight of her luscious big tits and round ass being caressed sent a surge of desire coursing through my body. As she continued her solo play, her moans grew louder, echoing throughout the empty house. Unable to resist any longer, I made my move, taking control of the situation. The sight of her writhing in pleasure, her tight ass being filled, was enough to make me cum. But the show wasn't over yet. As she reached her climax, her body convulsed in pleasure, squirting all over the place. It was a sight to behold, a testament to the raw, primal desire that had taken over.