TCB Event #5: The Fabulous Crossover Fiasco. Based on Midnight Shadow's 'A Twist in the Tail - Community Service' series.
Follows Chapter 3 of http://www.fimfiction.net/story/4662/Twist-in-the-Tail%3A-Community-Service. Simone thought she had struck it rich while looting the Conversion Bureau. But an accident with pontification potion left her a unicorn mare, trapped in Equestria and planning her revenge on the young kid that might have been responsible.