After a heated argument with my stepsister, I found myself in a compromising position, with her threatening to reveal my dismal grades to our parents. Desperate to avoid the consequences, I resorted to a proposition - a favor in exchange for my silence. With a mix of fear and curiosity, she agreed to perform oral sex on me. As she unzipped my pants, her eyes widened in surprise at the sight of my massive member. Despite her initial hesitation, she eagerly took me in, determined to satisfy her step-brother. The sight of her petite frame working my cock with her skilled mouth was enough to drive me wild. I couldn't resist taking control, guiding her in a passionate session that left us both breathless. Our encounter was far from over, as she eagerly straddled me, riding my throbbing cock in a frenzy. The intense pleasure led to a wild romp in various positions, ending in a satisfying climax that left us both spent.