James Potter was not meant to be out of bed at 1.30 in the morning. He was also not meant to break into his parent's garden shed to steal his (confiscated) broom to practise quidditch. He was also not meant to borrow his mum's wand to achieve this with.
However, being James Potter, he was currently doing all three.
Still, if he hadn't been sneaking about so late at night, he wouldn't have discovered the dwarf that crashed through a portal in mid-air into said garden shed.
James lit his mum's wand with a quick 'Lumos' and then cautiously stepped forward and peered into the wreckage.
"Who's there" he called out warily.
A few moments passed before a groan could be heard from underneath the planks of wood. Keeping his mum's wand out just in case but not wanting to leave the person there, James began shifting the pile until he came across someone who looked rather like an overgrown child.
"Who are you?" he asked.
The figure sat up slowly, rubbing his head. He looked around the garden, feeling dazed and rather confused, before his eyes landed on James.
"Fili, son of Vili, heir to the throne of Erebor" he said slowly, slurring his words. "Now who in Mahal's name are you? And where are Kili and Thorin?"
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James stood there in shocked silence for a moment, staring at this… man? Dwarf? What did he call him? Was he a muggle? He said heir; was he some sort of dwarf prince? The young wizard felt just as confused as this "Fili" looked; he decided it was best to try and take charge and do something.
"Right Fili, come with me; we'll go inside and get you sorted out". He didn't think telling his mum and dad about this was a good idea; they might ask questions about why he was outside at that time of night in the first place.
"I will not come anywhere with you until you tell me who you are!" said Fili angrily. Suddenly, to the great surprise (and delight!) of James he pulled out two gigantic twin swords from behind his back and pointed them at the teenager.
"Now I have no wish to hurt such a young child of men" said Fili. "But you will tell me who you are, where I am and how did I get here!"
"Well" James said slowly. "I am James Potter, a, uh, 'child of men' as you called me. I'm a wizard. Are you a wizard or a muggle?" He cringed internally, praying he hadn't just made a massive breach of the statue of secrecy.
"You are a wizard?!" exclaimed Fili. "I thought there were only five! Do you know Gandalf?"
"Only five?! There are thousands of us!" laughed James. "Who's Gandalf?"
Fili shrank back suddenly, feeling panicked. If he was in a place where there were thousands of wizards and no Gandalf, then just how far from home was he?
"I must know" said Fili. "Where am I?"
"England" said James. "I'm home from Hogwarts for the summer holidays. That's in Scotland by the way."
"Where are the Blue Mountains?" cried Fili desperately. "Where is Erebor? Am I still on Middle Earth?!"
"You aren't on Middle Earth, just Earth" said James cautiously, not wanting to panic Fili. "I've never heard of the Blue Mountains but I've heard the name Erebor before. If you come inside, we can have a look in the library for a mention of it. I think it's in a storybook somewhere."
"That is strange" said Fili worriedly. "Very well, I will come inside with you."
James smiled happily at him. Suddenly though, he frowned as a thought occurred to him.
"Mum's going to kill me if I don't fix the shed" he said. He waved his wand at the destroyed pile on the floor and said "Reparo". In an instant, the shed was as good as new.
James laughed as he led an astonished Fili inside.