Rarity takes her health very seriously, especially where it concerns her physical appearance. It's not always easy to do so, especially for one with such decadent desires, but fortunately she has prepared herself with all the necessary vitamins and minerals to keep herself in peak condition.
And something a little extra, just for that bit of oomph a mare needs to be particularly eye-catching.
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Contains the following: fat, slight slovenliness, bimbo, chesty quadruped, and RariTwi teasing.
Chapters (2)
So the mane 6 are massive because they're taking a new medicine? I'm very confused
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Ostensibly the vitamins aren't supposed to actually make anyone "bigger", rather they reallocate mass to a particular kind of shape. This is most noticeable with Rarity but vaguer with the others. Are we to imagine that Twilight is also fat normally? Who knows, I didn't bother to think that far ahead.
This is a one-off thing, it was just for the sake of thinking about a particular body type, it's not really supposed to be that complicated of a plot. ¯\_(ツ)_/¯
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Interesting. It makes more sense now. It's...enhancing certain areas on them.