Yay for pleasurable orgasms! I hope you go from strength to strength. For me, after the first few rather shaky efforts, I found my orgasms were at least as pleasurable as before, and often more all-over-the-body than before.
If you had your prostate removed and what came out is watery, it could well be urine - remember, the prostate removal also took out one of the valves that controls urine. Now, the only remaining valve is the one that used to control semen. In other words, it used to open at times of orgasm. Now it has to be reprogrammed to stay closed during orgasm. It usually takes quite a few months.
For a diagram see https://www.recoveringman.net/bladder-control-after-radical-prostatectomy/
The good news is - urine is sterile, so it is not such a big deal to dribble or spurt a bit of it during arousal or orgasm.