My son and daughter-in-law have their own business and often had to go abroad together. They have one child, Sarah our granddaughter. Ever since she was little she was used to staying at our house while her parents were away on business. One day I was alone in the house with Sarah who was 12 at the time. Sarah was in her bedroom and I went to the toilet, which is situated next to her bedroom. As I passed her room I noticed the door was very slightly ajar and I could just see her lying on her bed. By putting my eye to the gap between the door and the frame I had a much better view. I was astonished to realise that my beautiful and supposedly innocent granddaughter was masturbating. She was lying face down and her skirt had ridden up around her waist exposing her white cotton knickers. Her feet faced towards me and her right hand was beneath her between her parted legs. I could see the tips of her fingers protruding from where her knickered mound was pressing against her palm. She was humping with a push and release motion, the edge of her buttocks clenching and unclenching rhythmically. I have to admit I found watching my pretty little granddaughter masturbate in this fashion incredibly erotic and soon my cock was at full attention. After about five minutes her thrusting became more urgent and her blonde haired head began to quiver. Her feet lifted off the bed and I noticed her toes were splayed under muscle tension. Suddenly her whole body pulsed and stiffened and she let out a faint but distinct gasp. Her thrusts were now spasmodic and violent as the orgasm flowed through her young body. Her left hand grasped the bed sheets, her knuckles showing white as she reached the peak of her pleasure. A few more thrusts and gentle pushes, a big exhale, and she lay still, her body heaving from her exertions. Then she rolled over and I quickly made myself scarce, retiring to the bathroom for much needed hand relief. I subsequently was able to observe her masturbating in this way several times between then and when she was 16. Sadly they then all went to live abroad permanently depriving me of the most erotic part of my life. But I shall never forget those times and often relive them when I masturbate.
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