I remember being around 12 when a buddy introduced me to jacking off. My penis was just at the stage of starting to grow larger and at first I masturbated using just my fingers. It wasn't long before it developed enough to start using my fist - discovering that spit or vaseline made it even better.
For what seemed like forever I would jack off feverishly - I remember closely inspecting my cock to see if there was any indication of semen. I knew the goal was to ejaculate but I didn't really know what to expect. I would masturbate until my cock would take on a vibrating buzzing sensation - hitting euphoric peaks that I thought must be orgasms - and each time I'd stop long enough to inspect it - hoping for any indication semen.
Then one night I was jacking off like a monkey in heat, when I felt a storm brewing in my groin. I knew something different was about to happen - then BOOM! My whole body tensed up and I was bucking around like a man possessed! Cum shot out of my cock and hit me square on the forehead. More shot out across my chest and stomach. I rushed to turn on the light so I could inspect it. I was so proud of myself!
After cleaning myself off, I still had a stiff erection so I tried to do it again. I had another orgasm but only a small dribble of cum. I must have jacked off a hundred times that first week, shooting small loads of cum all over the place.
For whatever reason - I thought I had better take a couple days off to make sure i wasn't addicted - sounds funny, but that's what went through my mind.
By the third day i couldn't stand it anymore. I made a big deal out of it that night - lit some candles and incense - read some penthouse stories until my hard on wouldn't let me ignore it anymore. I got the surprise of my life this time when I came - spurt after spurt shot out of my cock like a geyser! I had cum in my hair, on my face, the wall, the pillows, my chest, stomach. I couldn't believe how much came out and how far the shots flew through the air. My next fascination was seeing how far I could shoot a load. Some of them had to fly three or four feet.