You never expected your wish to go to Equestria to mostly come true, and you never expected to meet Flash Sentry, and you never realized just how little documentation you need to rent a woodchipper.

This will end well.
With an audio reading by ShadowOfCygnus
Mild gore, second person, sex tag for innuendo

Mark is a Brony who has just watched the series finale of My Little Pony: Friendship is Magic. He is overcome with sadness, but then a magical character offers him a chance of a life time. He takes it.

Rip n' Stitch, a notorious serial killer terrorizing America has just been caught by the FBI. However, when bringing him in, he slipped out of his cuffs and ran deep into the bureau. He tried to hide in a room that was supposed to be locked and fell through a portal that was supposed to be sealed.

Now a team of three has been assembled to go after the killer. This has happened twice before in the past and an alien world full of peace and happiness is in danger.
Eureka; a criminal profiler, Hawkeye; an FBI agent, and Vortex; an ex-marine must travel to this world incognito and stop Rip n' Stich before he harms any of the natives. They must blend in and apprehend him undetected.

But their biggest obstacle may be giving up their hands for hooves.

A canon part of the PonyEarthVerse.
Added to Twilight's Library on 12/4/2014.

I knew I should've called in today. I wasn't sick, but at least I would've avoided all of this mess. One moment I was making myself comfortable during my lunch break for some off the clock zzz's; the next, I'm a blue stallion background pony trapped in a kennel and robbed of my personal effects.

You say you've heard this song before? Care to hum me a few bars?

EDIT: Awesome new cover provided by JazzyQ
Extra Character Tag: Batpony.