I was 14 when I caught my 17 year old sister having sex with her boy friend in the garage. Her panties were on the ground and her boy friend was sucking her pussy. She didn't know I was watching everything hiding behind one of the cars. That's when I accidentaly kicked a can that was behind me saw me runnig back in the house. I threatend to tell my Mom about it because I knew she was going to do something bad to me. Only threatend her to keep her away from me. Weeks passed never saying a word about it and one day she humilited me by stripping my clothes off in front of her boy friend when my mother was out of the house. I remember her boy friend taking naked picture with his phone while my sister held my legs spread out saying "now everyone is going see how small your tits are" if you tell my Mom about what you saw. I had never felt so bare and embarrassed in my whole life. 7