No one's home, and my stepsister, with her big butt and big dreams, sees this as the perfect opportunity to practice her deepthroating skills on me. She's in a black bodysuit, her curves accentuated, as she takes my cock in her mouth, going deep, her throat contracting around me. She's a natural, her head bobbing, saliva dripping down her chin, until I can't hold back any longer. I grab her head and fuck her throat hard, pulling out to cover her face in my hot cum. She smiles, licking her lips, pleased with her performance.