Unwitting brother's surprise as step sister fucks sex doll behind his back

My step-sister sneaks into my room, ready to indulge in some naughty fun with my favorite sex doll. She\'s a fitness fanatic with a tight, black body and big, luscious tits. Watch as she skillfully pleasures me, then mounts my hard cock in missionary position, all while her step-sister is just below, oblivious to our escapade.