Id love to "fill out" without doing any of the work myself. Either secretly, or someone stuffing me. That way it could be out of my hands and I could plausibly deny being fat because of any bad habits I had or anything I was doing. I would feel like this part of destiny was decided for me. Getting big was just going to happen, I might as well accept it.
Fantasy of being a lot fatter than I am is currently a big turn on. I guess maybe because I'm not there yet. I imagine myself wearing a nice outfit of a tight polo shirt and khakis or buttondown shirt, and my belly rippling as I walk, spilling over my belt.
I'm turned on my the concept of like, losing control of my weight. Either because I become addicted to food, or because I surrender my body to a feeder, either way I'm gripped by a fantasy of helplessly watching my body slowly inflate into a helpless mountain of flab around me.