Twilight's recently ex-coltfriend; Spellcraft, really wants to get into Twilight's metaphorical panties. But after trying to cop a feel too early in the relationship, he was dumped. Now he plans to swap bodies with another stallion to start all over again. A new stallion in town is the perfect candidate. However, things don't go as planned when it turns out the stallion he's swapped with is actually Twilight's brother! Trapped in the body of Shining Armour until he satisfies his need for Twilight's body, he believes the only way he can ever have what he wants, is to take it.
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If you want a build up to the fun, read from the start.
If you're only here for fuckery, Chapter 3 is where you should be---(Anything about the story you should know you can get from the description)

Contains: Coarse Language, Rape and (sort of) Incest.