I think I got the original idea from a story I had read at 'Solo', so even though it may sound similar, it's something new for me that I wanted to share. I had a large above-ground pool put in this year. What turned me on was the pool waterjet. I had to adjust the angle of it to get the maximum pleasure, but when I found it I was on my way.
I developed two techniques, both similar to start. But the faster method was to pull my foreskin back when my dick got good and hard, and the jet on my uncovered glands would make me shoot in no time. But the other technique, my favorite, was to never touch my dick with my hands and not pull back my foreskin. I would start off with my soft dick letting the water jet bounce it around while I moved my hips forward and backwards as if humping the jet of water. Soon it would get rock hard and stop moving around, just jutting straight out. I let the direct jet of water hit the underside of my dick, following the big vein from the balls to the head. Sometimes stopping to concentrate the water on the spot right under the head. The cock is so rigid it will sometimes move to one side or another, but usually once it is this hard it stays concentrated in the direct center of the jet. The thrusting of the hips back and forth is all the movement needed, often putting the tip of my cock right against the opening. You can keep 'massaging' your hard dick for a long time before shooting, just back off from the water pressure. When there is no turning back, I move about 3 feet to the right and shoot into the intake skimmer opening. No cum floating around in the pool, and a fantastic orgasm.