Weight swap where the story ends with both girls being fat

[Orima]

I'm looking for a story where two girls swap weight through any means. Fat girl and thin girl become thin girl and fat girl, yadda yadda. But what I want is for the story to end with the thin girl being at least chubby (either by not losing all the weight, or regaining weight, I don't care). Any plot can happen inbetween, I just want it to have that sort of ending.

Bonus points if there's reality alteration, but it's not a requirement.