I was a latecomer!
By the time I was 15, Robert and I had been fooling around for years. He was two years younger than me and we both loved sneaking off up to the mountains around our homes (we were close neighbours) and getting dirty. We generally used to show each other our cocks and play with them till they got hard but neither of us were able to ejaculate. Robert's mother knew we were up to something because when we returned from the mountains she sometimes made us put our hands out so she could smell them for 'peter smells'. Maybe she just liked the smell.
Anyway, one time Robert asked me to come up the mountain with him after school because he had something to show me. I guessed it was more than just his dick because I had been seeing that since we were infants.
When we got to one of our favourite hiding places in the deep bracken, we both pulled down our trousers and underpants and revealed our semi hard cocks. Robert had a delightful long thin cock with gorgeous red pubic hair, just like on his head.
This time it seemed different as he bade me watch him carefully. He began to stroke his cock more meaningfully than ever before. He kept this up for maybe three minutes getting red in the face and breathless. This was new! Remember I was two years older than him but had not yet began to cum.
He eventually cried out 'Look at this!' and came. Great spurts of semen shot out over the grass and Robert gave out the most explosive groan. I was amazed and just a little jealous. But my turn would come.