One day, David, the boy who introduced me to mutual masterbation got me to help him, and his sister, erect their tent in the nearby woods. When it was built he said he needed a pee, but I said your sister, who was with us, will see. He said 'it doesn't matter as she often gets in my bed and plays with my cock'. 'She likes it and wishes she had one.' I said I didn't believe him so when he got back from peeing he told his sister I didn't believe she played with it, so show him. She pulled down his shorts and pants and immediately took hold of his cock, which was hard in a few seconds and started to wank him. He asked if I would like her to do it for me. Watching them had made me get an erection, so of course I said yes. I helped by pulling down my trousers and pants and she took a good grip of my cock and it only took about five minutes for me to reach an orgasm. Felt marvellous, but she wouldn't let us touch her pussy.
About a week later he asked me to come to his house as his brother and friend wanted us to bring them off. His brother had taught him to wank, and he me, so I went with him. He said his parents and sister were away shopping for the afternoon. We went upstairs to the two boys bedroom, the sister had the small front room. On the two beds were the two boys naked with lovely erections that they were stroking. They told us to strip and sit across their thighs so our cocks were against theirs. I had David's brother whilst he wanked his mate. We wanked each other for quite a whilst then my wanking partner said he was cumming and shot all over my stomach. David's partner immediately shot his load on seeing my chaps cock explode.
We went into the bathroom to wash off the first cum I had ever seen, but David said he saw his brother cum every time he wanked him, at least twice a week. No wonder he was good at teaching me the pleasurs of life. Whilst we washed each other we wanked together until we both got that marvellous feeling, that all the guys reading this will remember.