First calm seas orgasm (i think)

I am giving another update on my progress to hopefully help others on their journey in the same way the forums have helped me massively

In the last 12 months or so i have progressed more than in the previous 12 years (after going numerous years with rarely, if ever, using my aneros). Tonight i think i reached another milestone.

I have 2 models, a helix and progasm. I use my helix far more/

Tonight i was using my helix when i got some involuntaries going pretty quickly while laying on my back with my knees up. I tend to contract my PC muscle and sometimes my rectum (pushing out gently), but have now learnt to try not to tense either my body, penis, other anal muscles, when feelings appears, as I would if trying to achieve ejaculation - this is a guaranteed way to halt progress

I find that holding these mid-strength contractions usually starts involuntaries, and i have to be careful not to push harder, or relax too much that i release the contraction, whilst actively trying NOT to push for an orgasm. I need a real mix of concentration (to not revert to type and try for an orgasm vs. relaxing)

I was more aware tonight that i was holding the contraction, making the muscle feel isolating (because not tensing up elsewhere) which had the feeling of the aneros being suspended inside me, almost pushing outwards due to PC/slight rectal contraction. I was able to keep my other muscles relaxed so that the intensity of the involuntaries and subsequent pleasure built. I occassionally felt what could be described as 'mini-orgasms' where i felt pleasure in times with involuntary contractions inside my ass/on my prostate - this feels really nice, but not quite fully orgasmic.

after 45 minutes or so i lay on my front, which typically brings on voluntaries quicker, possibly because of the 'pushing out' contraction behind harder to maintain while face down. i had some contractions and pleasureable feelings again, some of which could be mini orgasms. after 15-20 minutes i felt the aneros move on its own and was able to let it happen, it moved into a position on its on and then i felt it start to pump rythmically as if i was orgasming. this lasted 20 or 30 seconds and was accompanied by mild orgasmic feelings but also a calm seas feeling (wave of endorphins?) going through my body from my head down. This was a really nice feeling and the pleasure waves continued but subsided a little. 

after about an hour and a half i finished the session as I was getting tired, but really happy with the progress. thanks to everyone on here with their useful contributions. hope this helps!