[Coastalm]

I was lucky enough to have my GF's (at the time) sister change where I could see a few times over the year and half we dated.
Her sister was a super cute, kind of shy, blonde that had no idea how cute she really was.
The best time that I saw her changing was when we were all at her Grandma's lake house. My GF and her Sister all stayed in the same room while we were there. I was taking a nap in the bedroom in the afternoon and my GF's sister came in and shut the door. She did not see me kind of open one eye and see that it was her in there. I did not think much of it and thought she would just get something and walk out.
A few seconds later I reopened one eye and noticed it looked like she was pulling her hair using the mirror that stretched from the floor to about 5 feet high on the wall besides the door getting ready to take off her shirt so made sure not to move and watched her take off her shirt and unhook her bra and toss it on her bag. Her back was to me but I was praying she would turn and expose her boobs to me. She did exactly that as she moved over toward her bag and got her bikini top out.
When I saw her grab the bikini top I knew what would follow next as she undid her pants and let them drop to the ground quickly followed by her panties.
In my mind she was standing there looking at herself in the mirror just wanting to massage her pussy.. but in reality who knows what she was thinking as she was standing there. I had a great view of her perfectly trimmed up pussy. I did not think it could get better, but it did. As she reached down to get her bikini bottom she leaned low enough to allow a view of her butt and pussy from behind and I remember it appearing to glisten in the sunlight.
I was hard as a rock at this point and wish I could have gotten up and slid my dick inside her so badly!
She then slid on her bikini bottom and quickly adjusted her top and bottom then silently opened the door and left the room.
I could not do anything but think of her sexy pussy and started pleasuring myself and grabbed the panties she had been wearing and took in the smell and little bit of 'juices' from her pussy that were on still warm panties.