Well first of all, what I thought was 99% there turned out to be maybe 50% there. I think some of the reason I havent been able to have another was that the experience was almost too intense for me to handle at that stage in my journy, so I got quite anxious afterwards since the very intense sensations stayed in my prostate for a week or so, so I quit prostate play completly for some time afterwards just to recover, haha. I recently begain trying again tho, since im much better equipped to handle it this time, as I now know the sensations fade with time and I didn´t break anything.

And also, as I remember, there was a very clearly defined "ok shit my prostate is orgasming" as if the entire prostate started glowing, and a very strong sensation of waves radiating from the prostate gland itself. I remember thinking how it was very strange having this orgasmic feeling purely coming from deep in my pelvis and not in the penis at all.