An unsuspecting girlfriend's afternoon delight turns into a backdoor surprise as her boyfriend's curiosity leads him to her tight, untouched ass. Gently probing, he soon finds himself balls-deep in her quivering hole, pounding her relentlessly. The intense pleasure takes him by surprise, and he can't help but explode inside her, filling her with his hot cum. She gasps, shocked but thrilled, as she feels the warmth spread within.