It all started with a series of mysterious magical readings picked up by Twilight Sparkle that were heading towards Canterlot. A mysterious magical force is starting to infect people and turn them into ponies, but with her friends already starting to change, Sunset Shimmer seems to be the only one who remembers they were ever human.

What will happen? Will she be able to stop this or will there be no humans left?

This has sex scenes in it tied into human to pony transformation, but its more of a clop with a plot thing. All characters are at least 18.