Last summer I was at my girlfriends house one day, when she had to go to a drivers ed class for about an hour, and told me to wait at her house for her to come back.
I was lying down on her bed watching TV and her younger sister, Paula, who was 14 was outside swimming in the pool.
Paula must not have known that I was still at her house because after she came inside from the pool she walked into the room to borrow some clothes from her sister in just a towel.
When she saw me on the bed she jumped in surprise and dropped her towel exposing her small breasts that were just starting to develop and her pussy which was covered in a small layer of hair.
At this point my penis automatically went hard, and because I was only in a pair of basketball shorts she noticed right away.
She started walking over to me and said 'I have that much of an effect on you huh, well its only fair that since you've seen me I get to see you.'
When she got to the bed she pulled down my basketball shorts and said 'I can take care of that for you if you want me too.'
So of course I said yes and she put her hand around my boner and started to give me a handjob. As she did this I reached over and put my hand on her breast and started to feel them and her tits. She did not stop me so I moved my hand down to her legs, and then to her pussy.
I started to feel her pussy and finger her, this made me all the more excited, so my cum shot out and landed on her legs, after she finished milking me to my last drop I finished her off and we cleaned up.