This isn’t my story but it’s my 13 year old sister’s. Yes I know, she’s a whore. She doesn’t care about herself and I know I should have stopped it. So I was sitting in a three seat aisle. I was sitting with my sister and a cute 14-15 year old boy. I’m a 20 year old and I’m taking care of her in Colorado while our parents are still living in Germany. So anyways, she was trying to sleep. Or so I thought. I was trying to sleep as well. And then I noticed that she looked at me, examined if I was really asleep. Then I noticed she made sure everyone was else was sleeping. And then she took off her blanket, and unbuckled herself and hopped on to the boys lap. I noticed that she had already been giving him a hand job based on how hard he already was. And then I watched her take off her panties and put the blanket back over herself. And then I heard her moaning softly and saw her  bouncing up and down really fast. And then she threw her head back and silently orgasmed. And then started to make out with him and then she crawled back into her seat and started to put herself back together. She started doing her hair and spent a few hours doing her makeup and putting on her outfit for the next day. Then I went and slept for the remainder of the flight. When I woke up there was only one hour left and she was talking to him and they were exchanging numbers and then I got up and got ready. When I came back they were making out again. That’s when I said ” you guys at least used a condom, right? And next time check if there’s anyone awake.”  And she had a look of pure terror. So yep my 13 year old sister got into the mile high club before I did.