i've often felt this
and i've had a fantasy similar to above about slowly getting bigger through the day, in mine though a bit different in that in mine i'd gain 1cm diameter an hour over a certain amount of days then grow quicker near the end
at the same time it would be really awesome to be sooooo fat that i/you're virtually round like a basketball
, in all these fantasies with me the health risks were non existant if only it was the case in real life
i've also fantasised women feeding me and or literally making me really fat