Disappointment was all Sweetie Belle had brought to Rarity all week. It tested Rarity's patience, but one day. One important day. Sweetie Belle pushed Rarity over her limit. Wicked ideas filled the designer's mind about how to get back at her sister. But those ideas may have also made Rarity lose her sanity.

Edit: I will most likely remake this, making it less confusing and with better writing structure.