Based on what you said, the main sandbox will be improved,but i would definitely like to see the girls visit the house more often, or at least have Asia be more present in the house because of what happens at the end of the current content.
But i would definitely like it's not neccesary since it would make the game much larger than it has to be, but I would like a larger world to explore and "have fun" in with the main cast. Cause while we do have 3 areas we can go, it feels like there isn't much to do in them because of their size but the sandbox just feels empty in general which is why I'm guessing you would like to expand on it.
All the best though and the game is really fun as it is, bless your heart for giving it to us weirdos XD