Different kind of Chairgasm

Hi all,
Having not used my MGX for a couple of weeks now due to lack of private time, I decide to have a go for a short time today knowing I wouldn't be interrupted.
I inserted it and sat at my computer for a couple of minutes and it felt very nice.
I felt the need to pee so I went to the loo but wasn't able to for some reason?
I returned to the chair and noticed (I think) that my full bladder was causing very pleasant sensations.
I began to rock back and forth on the chair and (I'm sure) I could feel the MGX rubbing my prostate.
I kept this up for a couple of minutes and the pleasure continued to increase until I finally had a wonderful orgasm, but with ejaculation.
I didn't touch my penis at any stage so my ejaculation was involuntary or at least hands free.
I really enjoyed it but is a full bladder likely to help this process?
It seems to have helped me in this instance.
Until this episode I hadn't really experienced anything much at all with the MGX except for the pleasure if feeling the MGX inside me. I was a little disheartened up until today but this experience has given me the confidence to go on.
Any comments?
Thanks
MrBater