When I was 13 my step-dad's younger brother moved in with us; he was only two years my senior. We shared a bedroom since the house was small. One day I walked in on him in the bathroom. He was stroking his uncut penis, and told me to watch, I might learn something. I had never seen an uncut penis, and asked him if I could touch it. He told me to wait until he finished, then I could.
When he came, I was fascinated with his ejaculation, as I had never seen one before. He let me fondle his now softening penis, and I became aroused. Mine was still pretty small, and I was hairless. He assured me I would grow. Later that week, I was home alone, and was in the bathroom. I sat on the stool with my pants around my ankles, and started stroking my penis. It was too sensitive to stroke as he did, since I am circumcised, so I just stroked below the head. The more I did it the better it felt, until I suddenly had a dry orgasm! It felt so good, I kept stroking, but that was it for the present.
On another occasion, we were alone and I asked him to touch his penis. we went into the bathroom and dropped our pants to the floor. Both of us were hard, and I took the opportunity to feel his penis all over. I pulled the skin back from its head, and then sat on the edge of the tub as I inspected it and stroked it for him. It was the first time I had really inspected another penis, and I was fascinated. He became impatient, and started stroking himself. He stopped and then looked me over, and fondled me a bit. I told him about my dry cum, and he reassured me that one day I would make cum as he did.
He took up his jacking again, and soon came. I had begun stroking myself, and as I watched him, began to feel myself coming. It was another dry cum, and would be another year before I actually ejaculated, but in the meantime I enjoyed regular masturbation, and when we had the chance, I would masturbate my uncle to orgasm. We would masturbate together on occasion, and masturbate each other, until he went into the army at age 18.