"I so hate trying to find new humans to play with," the Guide sighed, crossing her arms. She sat at the top of a mountain, gazing down at a small village. She had visited it in the hopes of finding someone interesting enough for her to move around, but to no avail. "I so wish those Winchesters weren't still in the wizarding world, they would have been…" Her voice trailed off as an idea occurred to her.

The wind picked up around her and she waved it away with a flick of her wrist, a grin beginning to light up her face. Perhaps the Winchesters from this time period were currently disposed, but there were infinite other time periods she could take them from. "Have to be careful though," she muttered to herself. "It can't be too far back, they have to know about the angel and the demon. It'd be easier if they were on good terms as well. Time for a bit of a trip, I think."

She laughed and vanished on the spot, the only remnant of her presence was the imprint of her hands on the snow. But soon enough they were swept away by the wind, leaving nothing. Traveling through time was simple, laughably easy in fact. She possessed powers equal to that of the god of this world, and even had a few tricks up her sleeve that he did not. Multidimensional travel, for instance.

"Dean, the Mark won't just go away!" Sam said loudly, his seat lying on its side after he had stood up rather violently. "You can't just ignore this!"

"Says who?" Dean asked, sipping at a bottle. His tone was bored, uncaring. "The way I see it, Cain fought the Mark for centuries. Who says I can't do the same?"

"So, what? Are you just going to stay here in the bunker forever? Drinking and going on hunts when you find one?" Sam demanded, slamming the table with the palm of his hand. "What about when a Hunt goes south? What then? Still think you are going to be a Hunter when you are a monster?"

"Aaand pause." The Guide said, materializing in the other chair at the table. Her eyes were sparking with interest, an idea having been planted in her brain by Sam's words. "That sounds like a lovely idea."

Sam and Dean, their argument instantly forgotten, pushed to their feet and simultaneously reached for their weapons. Sam drew the demon-killing knife whilst Dean pulled his Beretta from the small of his back. "Who the hell are you?" Sam asked, assuming a knife fighter's stance. "How did you get in here?"

"Can't ward against something you don't know about," she advised them, kicking her feet up on the table. "Now, shall we get to business?"

She waved her hand and the Winchesters were suddenly back in their seats, unable to move except to turn their heads. "What the hell?" Dean asked of no one in particular, struggling against the magic. "Let us go!"

"Oh, relax," she rolled her eyes and smirked. "The older versions of you were so much more agreeable. Oh! Maybe that's because the angel and the demon were there. I'll just bring them here, shall I?"

She snapped her fingers in a remarkably Crowley-esque way and, just like that, the angel and the demon were there as well. She had apparently conjured chairs in the same motion and the new arrivals were sitting at the table alongside the others. "What the bloody hell is this?" Crowley, clearly confused, growled. He fixed Dean and Sam with an accusing look. "If you needed to summon me, I do have a cell phone."

"This wasn't us," Sam said, nodding at the Guide.

"What are you?" Castiel asked, his eyes narrowed. A flash of understanding appeared in his eyes and he leaned back slightly in his seat. "You are a Guide."

"Very astute, Castiel," she beamed at him happily. "Would you mind quickly giving them an overview of what I am? I told the older Winchesters and I really do hate repeating myself."

"Cas, what the hell is she?" Dean asked, a hint of worry edging into his tone. If this thing was powerful enough to trap an angel and a demon without breaking a sweat, it meant powerful.

"She is a Guide. They are multidimensional beings. They like to meddle in the affairs of worlds, changing things to better suit their tastes and whims." Castiel struggled against the magic that held him to no avail, wishing that he could summon his angel blade. "They are incredibly powerful. Stronger than even an archangel."

"Oh, please," she scoffed. "Your God and I are probably right around the same level. Well, mostly. He might have a bit of an edge on me here. But, hey, that's alright. Now, to get down to business, I have been so bored. You have no idea just how much of a trial it is to find interesting humans to relocate."

"Whoa, what do you mean relocate?" Dean asked, cutting her off as she opened her mouth to speak again.

"I mean there are plenty of other worlds and dimensions that I think you would do well in," she said brightly, examining her nails.

"I don't know if you have taken notice, but we seem to be doing fairly well in this world." Crowley said irritably. "And if you don't mind, there are issues in Hell that demand my immediate attention. People to kill, deals to finalize, demons to torture."

"Plenty of time for all that once you get back," she told him sternly. "Don't worry, I'll be returning you to this exact moment in time after you have finished up your time in Idris."

"Idris?" Castiel asked, "I am not familiar with that city."

"Well, you won't be there," the Guide said, grinning. "I think, Castiel, it is high time that you were returned to heaven with all the power of an archangel. Play by my rules while you are there, or I will make you."

The angel vanished in the next second, and the Guide turned her attention to Crowley. "Now, the demon. This earth only has one layer of hell, but I think you have earned your title as one of the Greater Demons. Ruling an entire world by yourself, what do you say?"

Apparently what Crowley said was of no great import to the Guide as he too vanished after the Guide finished speaking. "What did you do to them you bitch?" Dean roared, struggling against the magic even harder now.

"And… the Hunters…." She mused, pursing her lips. "You know, I wonder about this. There are Hunters where you are going, Shadowhunters to be precise, but I think that I have a much different idea for you two. You are so used to being Hunters, what about when you are the very things you hunt? Yes, I quite like that idea. Oh and, of course, I think that you two need a makeover before you go."

Dean and Sam felt a curious sensation envelop them, simultaneously hot and cold. It only lasted a few moments before it ended and both Winchesters felt something terribly different about themselves. Dean glanced over at Sam and his jaw fell open in shock. "Sammy?" he asked, his voice catching in his throat. "Y-you're-."

"Young," Sam said, looking over at Dean. "Dude, you're a teenager!"

"So are you," Dean said, horrified. "What the hell?"

"Yes, much better," she said happily, rising from her seat. "You will fit in much better there. Well, by age and appearance at least. I am afraid that Shadowhunters aren't very charitable to werewolves and vampires at the point in time I am sending you. But I think you will manage."

"We aren't werewolves or vampires," Sam said, wincing at the way his voice cracked.

"You are now." She smiled, waving her hand and sending them away.

She leaned against the table and sighed, crossing her arms. "Well, this will certainly be interesting." She said to herself. "I do hope that they don't die too often, rewinding time too much can be annoying. Maybe I'll reset them and make them Shadowhunters if worst comes to worst. But, for now, let's see how they handle being monsters in a world like that."

So, before I enter the world of Mortal Instruments, I thought I would preface this. This will take place throughout the first books in the series, potentially into the Clockwork series as well depending on its reception. In case it wasn't clear, I am not making Sam and Dean shadowhunters, I thought that the Hunter idea was a bit done. So I made them monsters. I look forward to your thoughts.

Cheers, Hallowed.