What to call it: A rise in pleasure, sucked-in Aneros, nice feeling, then fades away

Yeehaa MyTurn!!!!

Sounds to me like you are making progress! 😀 😀 😀 It could very well have been a mini-O. I have had one of those so far, and what you are describing sounds very similar. Have a look in the Aneros WIKI glossary for definitions. You can read about my so far one and only mini-O experience in my Blog if you want.
I dream of incredible progress. - Aneros Blog Entry

Does the Aneros have to be sucked in in order to do its thing (involuntaries, etc)? Or did it "know" that it needed to embed itself deeper to reach (the best part of) my prostate? Or is my body aware of to what extent the MGX must be sucked in?

From what I've read and personal experience, I don't think anything has to be any certain or specific way on this journey. Each persons experience tends to be unique. Don't obsess on the details and the how's and why's of what happened. In my own mini-O experience I just relaxed and observed the sensations. There was no contractions of any sort that I recall. That doesn't mean it will be like that for you. I'm just giving you a comparison as a possibility of what might or could happen.

Love_is

I would say one good tip is to come to feel that an orgasmic resolution is no longer important. Enjoy the experiences for what it is. Someone else said it better than me. Basically, try to learn to feel (even when having sex or masturbating) that you are satisfied before ejaculation. Then these mini-os or whatever they are will be satisfying as well. Having this feeling will only help you progress faster.

I mean... I've not even had a dry-o yet so maybe I don't know what I'm talking about, food for thought!

I would say from my experiences that this is a beginning of building towards being something productive; P-waves, Super-O...who knows. For me it always sucks in deeper and it starts to progress from there. Your journey is progressing!

Yes, I only felt a little "disappointed" that I couldn't have built on the pleasurable foundation, not that I actually actually needed an orgasmic resolution.

Yesterday's session, I think I had 1 and 1/2 of these rise-peak-fall pleasureable Aneros sucked-in deep and involuntarily contracting moments. It seems to work best when I fantasize ("mind pictures/mind video"), although I keep porn on in the background to keep me at a decent baseline arousal. I felt the need to vocalize a little! I love them.

I can't write much coz I'm having another session soon.

Hello MyTurn, 🙂

It seems to work best when I fantasize ("mind pictures/mind video"),...

I think that is an important step for you to have taken and to understand. It's interesting though, in my own experience I've found that sometimes I can create these mental images and sexual fantasies and it makes my arousal and thus pleasure sky rocket. And other times where it doesn't do so much. One of the keys I've found is to be open to finding what arouses you, as it does not always stay the same. Sometimes I'll be surprised as to what thoughts and images makes me aroused! LOL That's all part of self exploration I suppose. 😀

Love_is

Hello MyTurn, 🙂

I think that is an important step for you to have taken and to understand. It's interesting though, in my own experience I've found that sometimes I can create these mental images and sexual fantasies and it makes my arousal and thus pleasure sky rocket. And other times where it doesn't do so much. One of the keys I've found is to be open to finding what arouses you, as it does not always stay the same. Sometimes I'll be surprised as to what thoughts and images makes me aroused! LOL That's all part of self exploration I suppose. 😀

Love_is

Tell me about it. My last session was a little hampered by the fantasy, which I found a little unsetttling. Actually it wasn't so much a fantasy as it was a recalled "still image" of someone I haven't seen for a decade. Weird. No attraction in "real life", but possibly that person, together with some other images (2 girls that used to get on my bus to school in the late 90's and who I spoke to once in like 2001 in a club), it seems did the trick.

This thing sure is confusing, but more of an "experience" than penile stimulation, which to me, is just a process by which to reach ejaculation. Almost like someone massaging your back in order for you to reach relaxation. Prostate stim really is a journey - unpredictable, surprising, limitless.