Every summer I used to go swimming at a friends home. We've known each other all our lives and walked in and out of their home without any worries. Since they had a pool we used to hang in the basement, change and run outside. One summer afternoon I walked into the basement and started to change, I did not notice that there were some suitcases and proceeded to get naked. My friends were outside swimming and I noticed that Cindy was there. I walked to the window and peeked out staring at her hot body. With one hand on the curtain and another on my cock I started masturbating. I stroked my cock faster and did not hear the bathroom door open. I guess it must have been five minutes or so when I heard a voice "humm" to my surprise I turned and noticed an older woman with white hair staring at me and my raging hard on. Embarrassed as I was, the shock of getting caught stopped me in my tracks. She said Hi, I am Charlie's grandma...

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