One day, while looking through a new spellbook, Twilight discovers a strange, foreign, yet oddly familiar word.

Anthropomorphism.

So, after some goading by Rainbow Dash, Twilight reluctantly decides to test the spell out to see if they can't decipher the word's meaning.

The result of this spell will ultimately change the ponies, their relationships with one another, and possibly all of Equestria as we know it.

Contains lots of sexual themes, anthropomorphic ponies, several kinds of transformation, futa, and expansion (and maybe some other things... I may have missed something).

Enjoy!

Update 7/11/13: Wow... I cannot believe the amount of attention this is getting! I mean, really. It's STILL on the front page's popular stories list. How, I don't know, but I'm attributing it to you guys for lack of a better answer! Sooo... thanks!

Update 7/12/13: Okay, we're out of the limelight now. I'm surprised it took this long for people to stop caring.
Also, if anyone can find a good busty anthro pic that passes the SFW requirement, please let me know. I've tried to find one, but the only good one I found was shot down by the mods.