This does not quite fit in with the options or aforementioned stages of immobility, but at least in my fantasy world I would LOVE to be barely mobile. I could still do most of the things I can do now, but everything physical becomes a complete struggle. Stairs, clothes, standing, walking, showering, etc, all become a sweaty ordeal which only makes me lazier, then fatter, then more and more helpless until I am verging on actual immobility.

A lot of things, but the surprises in particular that come from transforming from a lifetime of thinness to a state of extreme fatness. The increased appetite, capacity, and perpetual gluttony. The increasing fear and avoidance of any kind of exercise. Bumping in to things. Physically struggling to do simple things, like reaching far or just standing up. Going from a medium size shirt to a XXL. Etc. I love these daily surprises and reminders of how fat I have become!

My short stature and expanding waistline are now causing my belly to bump into the kitchen counter (among other things), which makes it a real struggle to reach things on high shelves like plates or food. Struggling to reach for my food is such a turn on! I even had some trouble reaching across the breakfast table this morning, since my belly was pressed right up against it.

I have a closet full of outgrown clothes. I'm pretty sure I could dig up some 32" or 34" pants, though I'd have NO chance of even starting the zippering process on those since I've swollen up to around 50" (though I can squeeze into slightly smaller pants).
Actually I just got back from vacation, bringing the only 2 pairs of pants that still fit with me. Naturally I popped a button when I bent over to reach my feet, so now I'm down to 1 pair that "fit" sort of... awkward but arousing.

The only thing that’s waned for me is the conscious, intense, active gaining I engaged in to achieve my current weight/plateau. It really is a major commitment, and more difficult to sustain without a partner.

On a less conscious level, however, my sexuality is deeply intertwined with my fatness and desire to get fatter. Every time I’m reminded of how fat I’ve become, or even just THINK about these things, I get turned on. That’s not something I imagine will ever wane.

My experience is very similar.
When I was younger, thin, and fit, I always imagined myself in a masculine, dominant (even sadistic) role both sexually and as a feeder. Then, when I really committed to gaining and started to get fat and soft and weaker, my sexual impulses inverted.

Now I can only imagine myself in a submissive, masochistic, feminized, feedee role. I think there is definitely a parallel between the weight gain transformation of the body and this kind of transformation of the mind...

Thanks for the post. I wish I could add more right now. Food for thought.

Feminization is definitely a part of my fantasy life. I like to imagine a dominant feeder incorporating estrogen along with my daily feeding. Maybe I’m aware of it, or maybe she or he is just sneaking it into my food — either way, as I get fatter, my moobs turn into breasts, my hips widen, my muscle mass decreases, my body hair thins, my skin softens... Meanwhile, my feeder is working out like crazy, getting stronger and even more dominant while I become weaker and more helplessly submissive.

I weighed 143 lbs (also 5’4” - very short) in 2013. My goal to date has been 243, because 100 lbs gained seemed like a nice round number. Unfortunately I’ve been stuck at a plateau around 220-230 forever now, but I KNOW if I do make my goal, I’ll want to reset the goal posts to 300, then 330...

Delivery.
Also, I get almost no exercise -- except when I walk across the street to buy snacks.

Well said. God bless neuroplasticity!