Peeking on my friend's little sister

So I got this friend who came to town from the country and his family still lives there. His little sister is 19 and wants to go to college here. She came up and stayed with us for a week or so when her exams were due. I never saw her, my buddy was hiding her from our group of friends, and we didn't understand why. When I saw her the first time it hit me. He was hiding her from us because she was stunning. I mean she was a ridiculously sexy blonde girl. I was aroused evidently, but did my best to not show it.

Later that week we wanted to play ball with a couple of dudes, so I went over my buddies house to fetch a football. Her sister greeted me in a towel and wet from the shover. My heart rate elevated and I couldn't say a thing. She let me in and said I could look for the ball, and went toward her bedroom. I could not resist the urge to follow her silently and peek in the door, as I always had a thing for naked teens.

My bargain had paid off. She was standing in the middle of the room totally naked.  Her white skin and blonde hair made her look like an angel. She was rubbing lotion all over her tight teen body. She went upwards from those long thighes all over her tiny ass, her flat stomach and the two perfect boobs. Then she started to try on all kinds of lingerie, that was the time I lost it and started to jerk of to her nude teen body.

Her first choice was a tiny black thong with a laced bra and she looked gorgeous in it. She played around a bit in it, squeezing her boobs and slapping his ass. She slipped out of it, and I switched gears as she put on her hot lingerie, a red set this time. Her fingers slipped in her panties and started working down there. As her moans started to become louder I snapped, and I came making a big noise. She noticed and turned toward me, but I was already running out the door yelling: 

- I got the ball, see ya! 

This was one of my most memorable jack offs, cause all my triggers were present, I love blonde babes, I definately adore teens and seeing a gorgeous blonde teen in sexyy lingerie was just too much to handle.