This happened one night a couple of years ago. My cousins were over, as our parents went out to a party, leaving us alone to hang out with each other for the night. It was me (I was 14 then), my cousins Dan (12), Tim (12) and Pat (14).
The night started out as any other night of hanging out together, but then we ended up in my bedroom. In my room there were bunk beds on one side and a pull out couch bed in the middle. We started to watch TV spread out in the room on the different beds and stuff like that Then we started to get horny. Dan said that he wanted to have sex, so he took a blanket and pretended he was having sex. He was moving around and making noises.
We were all laughing and found it funny, but started to get a little hornier ourselves. We all started to do the same thing as my cousin, and then Pat had to go downstairs for something. While he was gone, my cousin came out of the blanket and we could see that he was naked. He didn't show us his whole body, but we still knew he was naked. This got me in the mood, so I started taking my clothes off, and then Tim followed suit. A little after that, Dan took away the blanket and was completely naked right in front of us. This got me hard and even hornier, so I took everything down and revealed my hard cock to my younger cousins. My big, hairy dick amazed them. They kept commenting on how big it was and how it was making them horny. This got me even harder, so I started stroking-off right in front of them.
Since they were too young, they just played with their dicks. We all got on to the big pull out couch bed and started stroking and rubbing our dicks, even touching each other's dicks a little too. It was very hot and as we were doing this, Pat walked in and saw us. All did was tell him to join the fun, so that was exactly what he did. He took off all of his clothes, jumped on to the bed with his huge hard cock and jerked off.
We did similar things to this a couple of times after, but haven't done it in a while. I hope to something like this again.