I am a freshman at USC and I live with both my parents, and my 14 year old sister. She is quite a beauty. She is still developing, but looking nice. She has a slim figure, nice developing breast, and beautiful blonde hair. I sort of look the same but just older.
It is during summer break now, and she is off school and so am I. The other morning, I was passing by her room, and I faintly heard her bed squeak. I was curious, so I moved closer to her door. I could slightly hear her breathing and occasionally I could hear her moving her fingers in and out because her juices were making that sound. As soon as I realized what she was doing, I was horny and started to get very wet. I stood there for about ten more minutes, listening to her breaths get deeper and deeper, and her fingers go faster and faster. Eventually I waited long enough and she did a quiet moan and I could tell she was moving around. I assumed that she was having an orgasm. I had never seen my sister nude, or knew she masturbated, and when I heard her do this, I was amazed.
I could hear her getting out of her bed, so I quickly went to my room. I peeked out the door and saw that she went across the hall into the bathroom. I could hear her taking her clothes off and getting in the shower. I was very horny at this point. I hung around in the hall until she turned the water off and got out of the shower and headed for her room. I passed her on the way and went into the bathroom.
She had left some very interesting evidence. I picked up her pyjama bottoms and they had a pretty good size wet spot for a 14 year old and they were creamed on the inside. I guess she was not wearing panties and I assumed that she was masturbating and orgasmed in them because there are no locks on the door. It was really horny, so I pulled down my panties that were really wet, and I began to finger myself on the toilet. I came almost instantly. It was probably the best orgasm I have had yet.
Listening to my sister was fun, and I try to do it whenever my parents are gone because it is interesting and turns me on.
Hope you enjoyed