Frustrated and horny, I find myself alone with my stepsister, her tight teen body and big tits a constant distraction. She catches me stroking my big cock, her eyes widening at the sight. With a mischievous grin, she offers to help, her small hand wrapping around my shaft. She jerks me off expertly, her pace quickening as I groan in pleasure. I can feel my load building, my cock throbbing in her hand. With a final stroke, she milks my cock, my cum shooting out in thick ropes, coating her hand and tits. She laughs, licking her fingers clean, leaving me breathless and satisfied.