Flip your step-sis upside down, her thick thighs resting on your shoulders. Her big, natural tits hang, jiggling with each thrust. You grip her waist, slamming your cock into her waiting mouth. She takes it, her eyes watering, makeup running. Your balls slap her chin as you pick up speed, fucking her face rough and raw. Her muffled moans vibrate your cock. You pull out, your shaft coated in spit, and she gasps, her lips swollen and red, ready for your load. You stroke, ropes of cum hitting her lips, chin, and cheeks, dripping down her face and onto her heaving tits.