In the dimly lit room, I watch my stepsister's curves undulate as she silently fingers her tight pussy. I can't resist joining her, she guides my throbbing cock deep inside her, her tightness enveloping me. We fuck hard, her moans stifled, my grunts muffled. I feel my orgasm building, her pussy clenching around me. With a final thrust, I release my load inside her, our eyes locked in silent understanding.