When I was thirteen years old my twelve-year-old cousin Jennifer and her parents stayed at my house for a weekend. That Saturday night both parents went to see a play and left Jennifer and me with my older seventeen-year-old brother, Eric. At bedtime Eric asked us if it was ok if he went to his girlfriends house for an hour. We both said that we were fine and not to worry about us. Jennifer had a hot little body for a twelve-year-old and liked to show it off.
That night she was wearing a tiny shortie pyjama that showed off her great legs and tits. I just got horny thinking about her. However, we both said goodnight and went to our own bedrooms. Shortly after, I started to hear thunder and heavy rain. The lightning was so strong that it lit up my bedroom. All of a sudden, Jennifer was knocking at my door asking if she could just sleep in my bed until the storm was over. I said ok and she immediately ran under the covers.
With every burst of thunder she hugged me tighter. I was getting very aroused with all of this. She kept hugging me and accidentally brushed her hand over my erect cock. I put my arm around her and told her not to be scared. With that she pulled my head towards her and started to tongue kiss me. I was shocked that she even knew how to kiss. As we kissed, she put her hand in my briefs and started to rub my cock. I then put my hand inside her panties and started to rub her pussy.
She was all wet so I put my finger inside and started to finger fuck her. She was moaning and shouting how good it felt. We both were literally shaking from the excitement. She kept pumping me faster and faster and I kept fingering her faster and faster until we both came in a huge explosion. We both calmed down and cleaned ourselves up. We heard my brother coming in so she ran back to her bedroom. In the morning we both had a grin on our faces when we sat down to breakfast. We had other occasions to be alone after that and we repeated our first experience together. I will never forget that first time.