In a moment of surprise, I find my step sisters mounting my shaft in a steamy encounter

I was taken aback when I stumbled upon my step sister in a compromising position with my best friend. The sight of her riding his throbbing hard cock was too much to handle. My heart raced as I struggled to fight back the urge to join in. Despite my initial reluctance, I found myself succumbing to the temptation. I could feel my arousal building as I watched her petite frame bounce up and down on his massive shaft. The sight was enough to make me rock hard, and I couldn't resist the urge to join in. As I took her in my arms, she eagerly returned the favor, taking me deep into her mouth. The sensation was overwhelming, and I found myself lost in the moment. The thought of my step sister and my best friend was enough to push me over the edge, and I let myself give in to my desires.