My cousin was only one month older than I and as he lived nearby we saw each other every day. He discovered masturbation first and clued me in on it. Masturbation wasn't the focus of our relationship and we had good times together growing up. However, we did share times of jacking off together!
One day in the heat of the summer he told me that he had discovered something that I might like to do, but that we would have to go to a nearby watermellon field. He wouldn't tell me what it was, but it was summertime and everything was an adventure. We got to the field and then went around the fence line to the back of the field where trees prevented anybody from seeing us. It was early afternoon and was really hot.
He then told me that he had 'made love' to a watermellon when it was hot and that it was a great feeling. He knelt down with a watermellon in front of him and started rubbing his hands all over it. I did knelt at the other end of the same watermellon and immediately threw a boner. He pulled his sweats and underwear shorts down and so did I. There we knelt (probably looking very foolish) with a hot watermellon in front of us with our dicks sticking out.
He had his pocket knife out and plugged (cut a round hole) the watermellon on his end at just the right angle. He handed me the knife and I did the same. He looked at me. I looked at him. We were goth grinning like a possum. In we went into the sloppy watermellon. The noise of our in and out movements only made me get harder. The hole was just the right size and going in and out with the rind putting pressure on the head of my dick was a great feeling. It didn't take long and we both plunged as deep as we could into the watermellon and shot our loads. Sort of a prelude of 'cumming together'!
All good things cum to an end and our dicks became limp and the session was over. We put the plugs back in place, pulled up our underwear and sweats and went to my house to raid the fridge! For some reason we never went back but I remember it as one of many wonderful sexual experiences growing up!!
Also, take a good look at the next watermellon you buy!!