i've thought about this a lot, it's a blend of a lot of factors. i love seeing people get changed by fat, both physically and mentally; i like the idea of not having to think about anything besides pleasure and growth; i'm obsessed with lavish excess, and pursuing said excess with no restraints while you plump bigger and bigger is awesome; and a big thing for me is being utterly catered to, with every demand and whim satisfied until you're massive, spoiled, and blissed-out. there's probably even more reasons but that's what comes to mind as the major things rn