About two-thirds of the time, I find myself stimulated to an orgasm. The other third, I'm just taking in the feeling of being full and then emptying myself out, filling again, emptying, and repeating (or not) as many times as I wish. That is a different level and type of satisfaction that doesn't require an orgasm.
When I stimulate myself to an orgasm, there are generally four different ways/conditions that I enjoy:
1) Use of the silicone double balloon nozzle to stimulate one of two types of orgasms. Usually in conjunction with a soapy/glycerin enema. The nozzle is long enough and inner balloon large enough that when when I rub the hardened shaft of my penis, the pressure back through my pelvic region works in conjunction with the peristalsis to gradually stimulate a deep anal orgasm that radiates away from my prostate. Once it gets started, it is largely "hands-free."
2) With one of my long tubes inserted and fully held by the retaining ball, I like to fill myself completely with warm water and then rub myself to a rather intense orgasm. This works best standing and allows me to feel both the tube throughout the length of insertion and the fullness from the enema solution. These are usually after the initial flush out enemas but may occur on the first filling if I can get the tube fully inserted. I have noticed these also tend to be the highest volume enemas I take (5+ liters). The after effect of pulling the tube and allowing such a large volume to flow out is quite pleasurable.
3) Use of latex double balloon nozzles or my SNCMAX3 to fill myself and hold the enema while I masturbate to orgasm. The SNCMAX3 sometimes challenges my ability to cum because it puts so much pressure on my prostate. But having the rectum very full with the combination of the enema inside me is pretty intense.
4) Finally, a variant of 3 (above) is to use one of the balloon nozzles and fill myself as much as possible and hold the solution in (for a bit) through the inflation of the balloon. I'll sit on the toilet and began to stroke myself towards orgasm. There is a point during this arousal period where I can deflate the inner balloon and extract the nozzle and use the sphincter and rectal muscle power to hold the enema in. If I leak a little (or a lot) there is no problem. I tend to edge myself along this because the sensation of clenching the rectal muscles and the building orgasm is really quite incredible. The challenge is how many minutes can I do this? One of my HRMs confuses this as bicycle riding because my heart rate gets up into the aerobic energy zone during these sessions. When I cum, there is no problem holding the enema in. However, as the contractions subside, the rectal/sphincter muscles will relax and I'm left with long outflow gushes of enema solution.