FMTM fully rewritten on December 12th, 2019.
Old version backup
Big Mac is also in this story.
Part 2:From man to mare: chaotic convergence
Part 3:From man to mare: an aching heart
Part 4:From man to mare: I love my mommy
Part 5:From man to mare: Time to tell

Derry Wilhall; a man having received a large inheritance from his grandfather, decides to live like he's always dreamed: alone and separated from society. A little excursion through the woods for some sight seeing throws him into the throngs of another world. "He" ends up in a body that is not his and will see things from another perspective.

Humanity is on the brink of a golden age. Interplanetary travel has allowed mankind to venture beyond our atmosphere with utmost ease and efficiency. We have achieved brilliant technology that allows us to run our automobiles on Hydrogen fuel, biotic implants that allow us to become superhumans, and nanotechnology that can perform the most intricate and swift operations for us. But, have we come this far for nothing? In all manner of impossibility, another Universe, Equestria, penetrates our own cosmos. The former of the two, Equestria, threatens to overlap our own universe, overwritting all of existance as we know it. The Only solution? Well, there is no solution really, but there is Conversion. Conversion allows Humans to live with sanctity, knowing that they are safe from the inevitable rise of Equestria. Of course, the price is your own Humanity, as you must relinquish it in order to become one of them. Many refuse the possibility of it, but they are only delaying the inevitable. This brings us to our main character, Delvin. Delvin is a freelance mercenary and the son of one of the greatest Human innovators of all time. Living in a city dedicated to Human innovation and superiority, becoming an Equestrian was the last thing on his mind. But when coming in contact with a deadly drug, his life takes an unexpected turn down a one way road.
*In my own variation of Blaze's Conversion Bureau universe, Earth is not the dystopia many CB universes entail. Earth is slightly better off than we predict it to be in 50 years, and when the ponies arrive, all manner of hell is released. Although welcomed by the United Earth Government, many still oppose them for their unwelcome arrival. Earth's citizens in turn are more reluctant when faced with Conversion and the harbingers of the supposed apocalypse. This means that the Human Liberation Front has one of the biggest followings ever and there's LOTS OF PONY RACISM. NOBODY LIKES PONIES IN FUTURE EARTH. GET OUT! With that said, Enjoy!*

Cyrus, a young man, living on the western seaboard of the united states is one day handed a vial of liquid of unknown effect and origin by a drug-dealer snooping about his neighborhood. He learns to live with hooves, a tail, a mane, and as a MARE. He deals with the social stigma of being a pony pre-conversion bureau opening and lives with the fact a decent majority of his neighbors are HLF members.

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

I used to think that life was boring. Same routine everyday. Get up, go to school, learn, go home, go to bed. But when everyone's favourite rainbow comes to town and follows me home, things get magical!

I put the comedy tag on because of the random bits of comedy.

During a traumatic event, an outsider finds himself flung violently into Equestria. His physical form is warped into that of the inhabitants but will his mentality follow? And even more importantly, will anypony truly accept him for who he is? Take a journey alongside this inexperienced youth as he finds himself in a strange new world with very different customs and tries his hardest to find a place for himself where he didn't before. A pity he can't even remember his name...

Okay, the basics. It's first person almost entirely. Very, very long chapters. I try to wrap them up around twelve to thirteen pages but a few slipped over that, especially towards the end. I'll release them slightly stagnated, as I'll be making final revisions as I go. Character tags are NOT final. I'll add more main characters as they show up in each chapter. Expect an update one or two times a week, probably. I adore reviews and structured, constructive criticism. Even if you just want to say you like it, that's fine too. :) I write stories to entertain peoples, so any evidence I get that it's working will encourage me. I hope you enjoy the story!

Have you ever had a dream that just seemed so real, that it was impossible to say for certain that it was even a dream at all? A dream that, despite all of its impossibilities, seemed to re-write your entire perception of reality, re-writing your sense of what—and indeed, who—you are? Accepting change is hard enough as it is. But when you're a somebody who wakes up as a somepony, how do you cope with the impact such a drastic change has on your mind and body? With changes like these, it must surely just be a lucid dream—albeit a suspiciously accurate one—just brimming with potential and ripe for exploration. So you might as well suck it up and make the most of these distressingly…unusual circumstances, and seize this psychological adventure before you wake up and the dream ends.
After all, this couldn't possibly be real, so the dream must come to an end eventually…right?

It's not real, it can't be real. Ponies are just cartoons and some fanfics on the internet. The wings, the hooves... I'm just having a bad dream!
I wish that were true. But pain, friends, and a strange drink are telling me this is all too real. I'm a pony now and I think the world is falling apart.
People, the end is nigh, the world has decided to go out with a bang, and it's taking us along for the ride.

*Loosely based on "The Conversion Bureau" universe.*
*Note about the art. Chatoyance was very kind to create some fan art. Just as a little note though "John" has brown hair not bond. Just a little tidbit to keep in mind while reading. Thanks so much again Chatoyance!*

It can be said the multiverse is a series of rivers, each one its own reality, all flowing infinitely close to each other, but never touching. When one river receives a sudden influx of energy and overflows its banks, touching another reality in the process, two species must come to terms with their sudden awareness of the other. And as the deeper ramifications of their meeting become apparent, both species must make a choice as one.

While this is a direct sequel to In Duty's Name, it is not required to read it. It is recommended, as it will help you get to know everypony better :)

This is a re-imagining of The Conversion Bureau universe as originally created by Blaze. All Canon characters are (c) Hasbro and Studio B. All Original Characters are (c) to their respective owners

When your life is as dull a gray as the world that surrounds you, the mundanities can make it all seem meaningless. Sometimes all we need is a little color -- or six -- to reintroduce us to what truly makes life worth living.

*6-16-2017 Edit, added Rainbow Dash tag because it triggered knighty.*