I would drill a small hole in a large bucket. Possibly add a valve. Fill it with water and hang it over him, adjusting it so that a small trickle of water goes into the funnel. Not enough to drown him but enough that he has to keep swallowing it. Then I would tie off his penis and wait until he is so full of water that he is just dying to take a piss. You can tell by thumping his stomach over the bladder. It will sound like a ripe watermelon and will be moaning. I would turn off the water so as not to injure him. Then, I would grab his dick and release the kmot. As I massaged the area, I would only allow a small amount of urine to release, thus building the urge even more. Once he was erect and hard and he seems unable to stand it one more second, I would let go and allow the urine to shoot straight up like a beautiful fountain soaking him and I as I continue to message his genitals. He will enjoy a burst of endorphins as he feels the release and I will most certainly enjoy having control .
Oh... rinse, repeat.