I would have to say that my very first orgasm where I actually ejaculated was by far the most memorable. I was completely alone and masturbating. I had orgasms before, but they were "dry" orgasms and felt completely different. Don't get me wrong, they were great, but there was something very different and special about this one. I was lying on my bed, completely naked and stroking away. I started to get the usual "tingly" feeling in my penis. It was generally around this time that I would get lightheaded, my body would stiffen up, my breathing would quicken and I would get complete body "rush" This time, something felt different. I kept stroking and started getting the usual feelings, but this time they were much more intense! My breathing became quick gasps. My legs became rigid. My penis got harder and swelled like it never had before. All of I sudden my penis started to jerk and twitch as a strange, unknown fluid squirted from the tip and I almost blacked out from the sensation and pleasure!!!
Yeah, that would be the first time I ejaculated; I was nine years old when it happened. I was with my "girlfriend" and we'd been at it for a while; I would be fucking her, have that warm, good feeling flow over me (and as had been usual when having sex with someone), and kept right on screwing her. The next thing I knew, I... wasn't feeling all that hot; my heart rate sped up and I could hear it in my ears; I felt dizzy and nauseous and I was having a hard time breathing and 100% sure that I was dying... and then I don't know what happened; it was like I blacked out or something but the next thing I knew, she was saying, "You did it!" over and over. I recovered enough to ask her, "What did I do?" and she pointed down between her legs and where my dick was still inside of her... and there was a whole lot of white stuff oozing out of her pussy. "You shot the baby-making stuff!" she said with a lot of glee. "Do it again!" I did do it again and this time it felt amazingly good but not as good - or bad - as that first time. I felt... stupid because she had known what I'd done... and I hadn't had a clue. Still, that moment - the seriously intense feelings - are permanently burned into my memory and will never be forgotten. And I never found out how she knew what I'd done, by the way...