Stumbling upon my stepsister Alexa and her boyfriend Camilo in the act, I couldn't help but join in. Alexa, with her luscious curves and big ass, was riding Camilo's massive black cock in cowgirl, her big tits bouncing enticingly. I offered to join, and she eagerly accepted, moving to blow me while Camilo continued to plunge into her. The sight of her chubby cheeks spread wide, taking his thick cock, drove me wild. I came hard, pulsing my load into her mouth, but Camilo wasn't done. He flipped her onto her back and pounded her pussy until he filled her with his hot cum, leaving her gaping and creampied.