I can't say anything that hasn't already been said, inspiring game. Are you entertaining applications for a contributor/collaborator on the project? I'm a programmer going on 15 years, and know enough about prose writing to be dangerous, but wouldn't go anywhere near as far as calling myself a "writer." If anything I'm just a halfway decent roleplayer.
A few folks have suggested a gluttony stat, and I'd like to +1 that because it could be used to introduce a more consistent difficulty curve with the in-game economy. Come to think of it, what I really have in mind is more of an expansion on the hunger/satiation mechanic that already exists, potentially as inputs to whether or not a girl will let you take her to bed. A gluttonous girl could gain more affection from being stuffed, but lose more affection if you run out of money before she gets there, so high risk/high reward. For a non-glutton this can work against you, as the girl can be "too full" for sex, not sure if that's already a thing or not.
The corruption mechanic you've mentioned a few times is also really interesting. I'm thinking about dating difficulty changing with the obesity rate. Consider a girl with neutral feeder/feedee proclivities, who the player turns into an obese glutton but keeps her neutral - meaning she's always starving but derives no sexual pleasure from the act of eating. This girl should get boosted negative affection events if overall obesity rate is low because of social pressure, although there's also room for expansion there with a self-esteem stat that could be similarly manipulated by player choice.
TL;DR: you managed to write an insanely flexible framework for any sort of text-based dating sim, and the possibilities are basically endless.
Thank you for your thoughts! I'd love for how stuffed the girls are to play a bigger role in sex scenes, rather than just a line at the beginning. Girls rejecting sex due to being too full is a good idea. I also plan for fullness to make them much more sensitive in the sex minigame I'll be creating in the update after next.
Making the obesity rate affect how self-conscious the girls are is a really nice idea. I do want the obesity rates to have a greater effect on the game & explore them more generally. The tricky part is handling it without needing to write lots more dialogue to handle all the different factors that can influence the girls!
Thank you too for your offer to assist with the project. Right now, I'm keeping it solo only, but I do plan to add a modding system to the game at some point. I'd welcome people to create their own mods to change how mechanics work or add more content.