I'm going to be blunt here, the sex change happens way too quickly and without explanation or logic. Twilight just decide to turn the character into a mare like that?! Why would turning a possible cheating guy into a mare be her or anyone reflex?! Also, why does turning Sil into a stallion makes it fair? Why would Sil even want this? Hasn't she just seen her boyfriend cheat on her? Your characters don't act in a natural way or you don't give the readers enough information to make it seem natural.

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Other than the change, was it okay after that?