Eighteen-year-old me, innocent yet curious, finds myself in a taboo dance with my stepmother. She catches me masturbating, her eyes widening at the sight of my big cock. Drawn to my youth and size, she can't help but join in, guiding me to her ass. I push my thick, straight cock inside her, and she gasps, her tight hole stretching to accommodate me. I fuck her hard, her big ass slapping against my thighs as she begs for more. I cum deep inside her, filling her ass with my load, before she cleans me off, her eyes filled with a mix of guilt and satisfaction.