Hidden in the shadows, I watch my best friend's sister, a captivating brunette, as she retreats to her room for some private time. Her hands roam her body, pinching her nipples to hard peaks, and dipping into her wet slit. She moans softly, unaware of my presence, her big ass bouncing as she grinds against her fingers. The room fills with her sweet scent, and I can't help but imagine those long legs wrapped around me.