I have 4 ideas in total and all of them could be toggled to make the game harder/more erotic or just nice features, you probably wont add any of these because they are hard to code but still thanks for reading if you do and thank you even more if you add one!
1. Could there be any fattening that make the game harder, there is weight classes like the preg except it comes from overeating or eating unhealthy food or they can combine and it stays until you sleep, die or exercise and you can ban certain ways to get rid of it like sleeping doesn't get rid of it, so then you have to go die or exercise in a new place like the gym once city gets released.
2. stuff like slime inflation can be permanent or just last longer and same goes for preg and could there be more preg versions like if its a slime you look slimy and can only get it off by showering.
3. can there be more character customization like wider shoulders, height, a belly, ear placement, bigger boobs. select coloring (like you click the part or something like that) and your digit grade ho high your heels go up to.
4. my last idea would be mimics that can copy things like shelfs or boxes and can only give you small clues to how its not real like its out of place or is moving a little.