Unexpected Turn Of Events

What would happen if a teen male appeared in Equestria? What would happen if he was mutated a bit from the messed up spell cast of Twilight Sparkle? What would happen if Fluttershy found him first? What would happen when Celestia gives him a mission? Well, I guess Nicholas Burton will need to expect the unexpected! OC/Fluttershy, may or may not have Human/Pony lemons.