*I'll be frank I did this out of a desired to have a soft warm onesie to have during this cold season of the year (at least for the tropics).

The backstory here is that a particular gym trainer (the story behind this piece exist in the pokemon universe I suppose) had made a small deal with the parents of a eevee pokekid (if your familiar its the one with the eevee onesie) to babysit them and did expect to lose to the deal.

Now the trainer has to babysit the kid while the parents handle some errands. However, the kid has some other ideas, using a loophole in the deal to make the trainer slip on a onesie like her. The trainer initially thinks it's ridiculous until the kid produces a large box. The trainer opens it and is shock to find a Cinderace onesie just her size.

With no other options around she slips it on much to the kids excitement (of having a life-sized soft and warm Cinderace 'plushie') and her embarrassment.
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Character(s) - BlueLilytZ
Pokemon© - Nintendo, Gamefreak