Hidden behind the door, I caught my busty, blonde stepsister masturbating. Her shaved pussy glistened as she thrust a thick dildo in and out, her big ass bouncing with each movement. Unaware of my presence, she continued, moaning softly, her large, natural tits swaying. When she finally noticed me, she gasped, her face flushing with embarrassment, but I could see the lust in her eyes.