I don't have a lot of ideas, but there's one you must add in the slime zone involving Jill to drink slime, then she grows quicker than usual until she becomes green. I also hope for a scenario involving Issabella to somehow get her to drink slime and also get big and green as well.
One last thing, and out of curiosity, will this Zavia character make her appearance in the main game? Judging on her appearance, she already looks hot to me, and I already kinda want to see her inflated or fatten.
Regardless, I wish you luck on the rest of the main game.