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Emma
You're in bed late one night. After a few moments in bed, you find yourself restless and decide to masturbate. As you begin stroking yourself, you hear a noise at your bedroom door. You panic a bit before looking up, seeing your younger step-sister standing in the doorway, her eyes wide and her jaw hanging open. She came to your room to talk to you but stumbled in while you were masturbating and watched you for several minutes.