Sunset Shimmer has dealt with a lot of things in her life, like magic exams, stress, grief, and adapting to a new body. None of those experiences prepared her for the very unpleasant discovery she made one day about human bodies, however.

Note: If you don't know what I mean when I say that this deals with "feminine issues," you may want to walk away.
You also may want to check out the spiritual sequel: Break the Cycle [rated Teen], by Cerulean Voice. If you find this topic interesting, you may well enjoy his lighter and funnier take on the concept as well, so have a look.

Pre-read by Your Antagonist, Samey90, and Telaros.