In Fattystria, a fat AU of MLP's Equestria, most everyone is fat or frequently encounters a situation of sudden and rapid weight gain or inflation. Most on purpose, others on accident, some can be looked at both ways.
These are their stories.

OC tag for Original Characters that appear in the pictures and (consequently) the stories.
Other tag for Canon characters in the same situations as the OCs.
Fetish Tag for Weight Gain and Inflation (nothing NSFW)

Art Contributors
dwgahagan (Fur Affinity)