Tried the game out for the first time a little bit recently and overall impressed with what you have created Trinian Games and had a few suggestions that might be worth thinking about ...
1) Character customisation - I don't know how much you can do with the 3d renders but two obvious choices would be optional pubic hair (common default in most games is on with optional off) and an additional smaller and larger breast size option (if the current is a C cup then a small B cup and a large D cup - still within a plausible size for an adult).
Could further tie those into the game with punishments at school for not shaving and in general have some alternate flavor text if the character breasts are smaller or larger.
2) With the ENF and Humiliation elements being core features one of the punishments could be forced nudity for a period of time.
Maybe the only 'clothing' allowed to be worn is a lanyard and card explaining the punishment which prevents further punishment for being naked in public.
3) Painted / False clothing as options to 'wear' in public with a chance to not noticed by NPCs, like 'the recover the phone quest' early on.
Allows the effects of going commando with the normal underwear color effects if not caught out at school (easier if shaved) with more adventurous characters choosing to go out in only a painted outfit as an examples.
4) Don't know if this is already the case, But the option to choose to leave the house naked would make some sense for a particularity corrupted main character.
Painted clothing might allow a less corrupted character to leave the house naked sooner as an example.
5) Limited watersports elements where it would make sense - Leaning heavily into the additional humiliation elements of both not being able to hold it and not having the privacy to deal with it.
Perhaps this could be limited to a general description with the player and non player character reactions to whats happening.
Example: the main character is stuck in the stocks for an extended period and gets the urge to use a bathroom ... obviously can try and hold it (which may or may not be successful) or let it go if they like the additional attention (has a humiliation kink)
Lastly - seeing as I'm sure somebody is going to make the assumption - I'm suggesting things that I think would be a reasonable fit for the game and not necessarily the things want to see.