I pleasure myself while observing my stepsister's derriere, and she unexpectedly catches me inside her. She craves to mount it

I was indulging in my usual routine when I caught sight of my stepsister's mesmerizing derriere through the window. I found myself drawn to her luscious curves, and before I knew it, I was pleasuring myself just by imagining her. To my surprise, she caught me in the act. Instead of being upset, she was intrigued and eager to join in. She seductively bent over, revealing her ample assets and enticing me to explore further. As I delved deeper, she moaned in ecstasy, her voluptuous body writhing in pleasure. She then took control, skillfully performing oral pleasure on me. The sight of her luscious lips and her enticing gaze was too much to resist. She eagerly mounted me, craving a raw and intimate connection. Our bodies moved in perfect rhythm, creating a symphony of pleasure that left us both breathless.