This happened when Jim and I were 15.
Jim and I lived in the same street since we were five years old. Growing up together we experienced everything together. This also goes for sexuality. It actually all started when our parents were off at work and we had nothing to do. Already the idea of being at home with our parents away for some hours made us horny. We would go to my dad's office and strip naked. First we would look at some porn magazines and then we would sit across from each other and play with our dicks. Most of the time Jim would start gently rubbing my balls and get my excitement going. Slowly stroking my cock would send hot feelings all over my body and make me come all over his chest. I would return the favour, Jim always came with great force. Spreading his sperm all over by body would remind me all day about our adventure.
One day my dad was at work and my mom would be out for work as well. Although we would never tell each other we could tell we would have our get together again. Unfortunately just before we were ready to go upstairs my mom returns!! What a bummer.
With our bodies still hot and horny mom tells us she wants us to come with her doing grocery shopping. It was raining so we didn't really feel like it. Driving over to the supermarket she tells us she has to stop to pick up something at a shop. She leaves us in the car with the comment 'It might take a while.'
Jim and I looked at each other like this was a message. I took my pants off and Jim started stroking my hard cock. The excitement of being seen made me come hard and quick. We cleaned everything up with a tissue and now it was Jim's turn. His cock was hard and warm and felt soft as ever. Just a few strokes was enough to send him to heaven. We cleaned up and threw the tissues in the dump bin outside. My mom returned after 10 minutes and said the car smelled funny!!
We both grew up and our paths split. We still see each other once and a while, but are both straight and are married. Still I once and a while think back about those days.