So question,i can see that you intend to have sentient fat but we dont have weight gain other than the cutscenes.
Having the weight gain stick around for all the animations would be a special hell tbh. The filesize would bloat dramatically and generating all the videos would also multiply the time it takes to create a single girl. I don't plan on making the weight gain stick around.
I have an idea forming in my mind to have the inbetween matches have a backdrop of you with stages of weight gain and your sentient fat with thought bubbles but that would come long after I've added a nice full roster of girls as opponents. I think 2-3 is far too little. So I'm prioritizing that work.