You were snooping in your sister's room, you thought she wouldn't be home for a while, but she returns home unexpectedly. You panic and hide in the closet hoping to avoid getting found out. To your shock, you see your sister lay down on her bed and start watching a video on her phone. She seems to be getting excited about something and then you realize she is about to start masturbating. You have no choice but to stay hidden in the closet, the noises she is making are so intense you can't help but crack open the door to watch. What a happy accident.