I had been jacking off of 4 years when I was 12, and had started ejaculating. I always had orgasms, but they were dry. My penis had grown from a 3 inch hard to 4. In the middle of a session, my penis seemed to flex suddenly and stretch out to 6 inches.
At 12 years, I usually managed 2 or 3 jackings a day. On one of these days, I experienced a rite of passage I'll never forget. I started as usual with my penis hard before I got my clothes off extended to its full 4 inches.I lubed it up, jacked slowly until I felt the first twinge, stopped until it quit bouncing up and down, and then began again. By then the vaseline had thinned out and was making a squishing noise as my fist went from my thinly furred pubic mound to my recently circumcised head. When I felt the next twinge, I stopped again, looked at my pecker and saw it was bouncing up and down and jerking in and out which was usual when I had been jacking for as long as I had during this session. (About 20 minutes.) While I was admiring the beautiful red color of the shaft, I felt a sensation in my pecker similar to what I felt when I contracted a muscle only in addition something seemed to relax. Then my pecker sprang up to about 6 inches and thickened so that it looked much fatter. It now had a valley in the middle of the top from the base to about 2 inches toward the head and 2 bulging sections on each side of the valley. I was amazed, and began jacking again furiously until I shot the biggest load I ever had till then. It took about 5 minutes for my penis to begin softening, and when it did it remained swollen with a bulging head for several hours. Jacking was never the same after this. It was much more pleasurable. I may add to this, tell how I began jacking with both hands, and describe the difference in sensations before and after circumcision.