As a late starter this was my first experience of seeing a guy cum. I already wrote a story of my first mutual jack off but this also really happened
I was always a rollerblader and often went through our park which was one of the biggest in the world. I have to admit though I was a late starter in puberty although I got erections a lot. I never knew what to do about them till this day I was rollerblading when I met this guy who was 15 and started talking to me how good I was at rollerblading, which got me flattered a little being 13 but looked a lot younger.
I showed him a few tricks then we took a break in a really isolated area where we took a break and sat down on the grass, he told me he was not gay or anything (not that I would know much about that being so behind in puberty) but that he found me very attractive and I was giving him a hard on that he had to take care of as he had really tight jeans on.
To my shock he took out his penis which was so huge compared to mine and started to pull his foreskin back and forth. I commented on how his cock was so large and what he was doing when all of a sudden he let out a loud moan and this white stuff shot out of his penis. I thought something was wrong when he said it was natural he asked me to show my penis to him which was so small even at 13 when he put his thumb and index finger on it it and started to pull the foreskin back and forth and gave me a lot of pleasure and got me hard.
My cock was so small compared to his although he told me it would get a lot bigger as I got older which was so true. I think I had a dry orgasm which been at that age was a little embarrassing but would get the real deal later on with both male and females which I will be so happy to share. But this was my first time to see sperm spurt out of a cock. More stories coming soon.