A potential idea I've thought about was for a Gluttony stat that all girls and possibly the player could have. Basically it's a stat similar to fitness that can rise and lower as the game goes on, maxing out at 100%.
It's main propose would be to allow girls to naturally gain weight without needing to go on a date with you, similar to how the Dizzy employees gain weight while they work. It should be a hard stat to raise as it could end up making the game a bit too easy and should also stop effecting weight once they reach barely mobile to avoid automatically immobilizing them. Maybe it could be linked to Dizzy items or upgrades. Dizzy addiction could also automatically raise the stat to 100%
I just think it'd be fun to raise a girls gluttony to max and leave her alone for a few months only to check back with her and she how's she's gained hundreds of pounds. Could even change some dialogue making her much more focused on food and eating. If she's living with you, you'd catch her scanning the fridge or pigging out on the couch.
it would really be more of an aesthetic change, but i like the idea of these kinds of statistics being displayed as over 100%, leaning into the idea of their appetite and desire growing far above normal. Under the hood, it would work like a normal stat. but a normal NPC, untouched by the player, would have it listed as a percentage between 0-70% or so, Like Fitness, but the true cap is 999%
I'm sure this is all moot since it's probably a ways away, though I do think the appeal of the gluttony stat would be the way it adds some autonomy to the girls. The Dizzy's addiction is already one of my favorite features in how it adds passive weight gain, so maybe it's more a question of balance or tuning?
I certainly like the idea of making the girls more independent characters who make their own decisions in the background of the game. The next update will include a little more in this direction, but perhaps they could have their own things going on that they could tell you about, such as a failed diet or having to size up their clothes.