Son of the Moon
Disclaimer: My Little Pony: Friendship is Magic is owned by Hasbro and Harry Potter is the property of JK Rowling.
"Talking"-conversation
'Talking'-thoughts
'Talking'-text, writing
PNMM-Post Nightmare Moon
A/N: This story is based off an idea I had for Seeking Friendships' Home but deemed it too complicated for that story. Also the HP world and the MLP world are separate in this story. Edited as of 06/16/2013
March 14, 1991 AD
Number 4, Privet Drive, Surrey, England
A ten year old Harry Potter lay in his room, which was just a cupboard under a flight of stairs, trying to get some rest before the next day's chores started. As he tried to get to sleep he began to create a world in his mind without his relatives, the Dursley family, a world filled with Griffons, Pegasi, Unicorns, and regular ponies. A world where he could find friends and a family that would actually care for and love him for who he was.
Harry's last thought before finally falling asleep was a simple wish: 'I wish I could go and stay in that world, forever and be loved.'
As Harry slept, he was unaware of his body changing shape, from that of a Homo sapiens, to that of an equine, a unicorn to be precise. The spell that his mother had placed on him to protect him in this world had expired five years early, a result of his mistreatment at the hands of the Dursley family.
March 14, 995 PNMM
Canterlot Royal Palace, Canterlot, Equestria
Princess Celestia watched as the Moon rose above Canterlot, seeing the Mare in the Moon on its surface and shed a small tear as she remembered her sister, imprisoned there for one thousand years. Turning away from the sight, Celestia was prepared to retire when she heard a voice echo in her mind.
'I wish I could go and stay in that world, forever and be loved.'
Looking around Celestia saw no pony near her, not even members of the Royal Guard were close enough to speak to her. Deciding that she was hearing things after a stressful day of holding court, the princess turned to head to her chambers when the Moon seemed to shine brighter for several seconds before fading. Turning back to look at the Moon, Celestia heard the same words in her mind again, and this time chose to find who or what was contacting her, as only member of the Equestrian Royal Family could communicate through their minds, but it was supposed to be used in an emergency.
Focusing her magical powers Celestia cast a search throughout Equestria and beyond, wanting to locate members of her family: Cadence was in Manehattan, Luna was on the Moon, and Blueblood was lazing about in Canterlot, but for the first time Celestia found another member of her family, a small ten year old foal, a colt, in another world. To the amazement of Celestia, the colt's magical signature bore a close resemblance to Luna's.
On this discovery Celestia was shocked enough that she was forced to sit on her haunches and stared outside. Thinking back nearly one thousand years she remembered that her sister Luna had disappeared from public eye for nearly a year with a tan coated Earth Pony with an hourglass cutie mark, before returning as Nightmare Moon and tried to overthrow her. Now it seemed that Luna had had a foal during her year away, but had managed to hide her child in a world where nearly one hundred years in Equestria was one year there.
Recalling that the colt had wished to come and stay in a world where they would be loved for all time, Celestia rose from the floor and gathered her powers once more, focused on bringing the foal to Equestria and to his true family.
England
With Harry asleep, Celestia's magic found nothing resisting it, and wrapped around Harry's body, embracing him before bringing him across the barrier separating the worlds, depositing him on the floor beside Celestia. A side effect of his return to Equestria was that any memories of a Harry Potter, the Boy who Lived were blocked, while any written records were left intact.
Canterlot
Princess Celestia was forced to sit back down as the power required to bring her new nephew into Equestria was more than she had expected. Exhausted but happy when she saw the young colt curled up on a small blanket beside her, she took this chance to examine her nephew and she saw many things that made her uncomfortable: the colt was little more than skin and bones, there were multiple scars along his back, on his flank there seemed to be burn marks, and at least one of his legs appeared to have been broken and improperly set. Resolving to ask him about this once he had awoken and gotten used to being in another world, Celestia gently picked him up with her magic and placed him on her back, taking care not to interfere with her wings nor potentially reinjure him.
Walking slowly so as not to disturb the sleeping colt Celestia made her way towards her chambers for a much needed rest, and eventually on reaching them, she placed the colt on her bed, making sure that he would be comfortable before joining him in the bed, spread a wing over his body and fell asleep herself.
Several hours later Harry awoke to find sunlight streaming into his eyes, causing him to raise his head in shock.
'What happened? Sunlight has never reached my cupboard before…' Harry's thoughts trailed off when he became aware of feathers covering his body, which now seemed much shorter. Glancing about he saw a white wing covering a small body, which Harry quickly realised that it was his. Looking around he saw that he was in a bed chamber, and spotted a mirror on one wall, with which he could just see his reflection: He had somehow been turned into a unicorn during the night, as if by magic. He could also see that the wing was attached to another being; it too had a horn in addition to the wing.
Throughout his examination of the room he was in and the shock caused by his reflection, Celestia had awoken as well, and decided to make her presence known by removing her wing from Harry's body. As soon as she did this, her nephew's head turned towards her and looked into her eyes.
"Good morning young one, I'm Princess Celestia, what is your name?" Celestia asked as gently as she could, thankful that the colt had not immediately tried to get away from her.
Harry's reaction to Celestia speaking was not what she had expected: Harry immediately tried to get away from her and promptly fell off the side of the bed onto the floor, nearly striking his head on it.
"It's all right young one, you are safe here; no pony will harm you." Celestia said, trying to keep Harry calm as she rose from the bed and made her way over to him. Once she was in front she lay down on the floor so that she would not be as intimidating.
"My name is Harry Potter princess, why am I here?" Harry said; getting up once he had recovered from the fall. He found standing on four limbs to be a strange sensation and did not look forward to learning to walk with said four limbs.
"You are here, because I heard your wish for a family and to be loved forever last night. Harry, I am your Aunt." Celestia responded before seeing Harry sit back down on the floor in shock.
A/N: This seemed like a good place to stop for the first chapter. It is short, and I shall endeavour to make following chapters longer. This takes place about a month before the Mane Six get their Cutie Marks. There are no prophecies, no seventh Element of Harmony, and I know I will get flak for this: there will be no Harry/Luna, or Harry/Celestia, or Harry/Cadence pairings: they are family in this story and that is a line I will not cross.