Disclaimer: I am not the owner of Blue Exorcist or Once Upon a Time

In Storybrooke, two new people had just arrived. No one had seen or heard from them, considering they kept to themselves and simply observed for the time being. A man with a white suit and matching white top hat stood next to his brother. With bright green hair, he truly would stand out among normal people, but at the moment, he was only watching as people came and went from a certain bar in this small town.

"Are you sure that's them? Last I heard, they weren't even in Assiah anymore." Amaimon asked, crouching down on the sidewalk with Mephisto standing behind him. He was leaning on his umbrella, smiling as he observed the young boy walk back inside, pocketing his phone with a frown on his face.

"Of course I am, there is no doubt in my mind. Can you not sense it within him? The power that is so similar to Satan's own flames." Mephisto asked.

Amaimon frowned, looking closer at the boy vanishing behind the doors of the Devil's Tavern. The demon began chewing on his nails as he studied the boy, turning back towards Mephisto once Ryan was no longer visible. "You may be right. Can I play with him soon and find out?" Amaimon asked, looking interested.

Mephisto sighed, moving along the sidewalk slowly. There was something else he needed here, after all. "Not yet, his power still remains sealed away. I'm sure you remember that much from our time in that realm." he commented.

Amaimon frowned, standing up and walking by Mephisto's side with his hands in his pockets. "Right…it seems I shall just have to wait a little longer before I play with him." the Demon King of Earth stated, while Mephisto smiled in agreement.

They both stopped in front of a building in town, with a sign outside calling it Gold's Pawn Shop. "You do realize this town itself is an oddity. Until twenty-eight years ago, it never even existed, and then suddenly it appeared. I've been watching it closely ever since, but something seems to have changed as of late." Mephisto commented, pushing the door open to the shop and walking inside.

A man stood behind the counter, smiling at the two demons who walked within before getting back to work on cleaning one of the antiques from the shop. "Is that so? Just what happened here, brother?" Amaimon asked.

Mephisto only smiled, his teeth showing as he knelt before a display case in the store. Within, a blade rested on display, sheathed in blue with a red case lying below to carry it within. A piece of paper rested on the base of the case, charred on the edges as if it had recently been on fire. "In due time, all will be revealed. For now, there is work to be done." Mephisto claimed, rising to his feet and glancing over at the shopkeeper.

"Is there something I can help you with?" Mr. Gold asked them, seeing the two observing the sword and walking closer. "This is truly a lovely piece, isn't it? The Koma Sword, I believe, excellent craftsmanship. If you'd like, I can pull it out for you to take a closer look."

Mephisto smiled at him, clasping both of his hands over the end of his umbrella. "Yes, quite so. In fact, there is no need to even unsheathe this blade, there is no doubt in my mind of its power." he insisted.

Gold smiled in return, leaning over the counter. "Well, just what are you willing to give me in return for such a blade then? I have to admit, I've grown quite fond of it over the last few years. Its value…well, it would be hard to put a price on such a thing." Gold commented.

Amaimon watched with interest, frowning at their interaction as Mephisto continued on with the discussion. "I see, in that case we best be off. I do not believe we brought the proper funds with us to purchase such a fine blade." Mephisto insisted, waving for Amaimon to follow.

"Have a nice day, I do hope you learn to enjoy our quaint little town. It is so rare to see new faces these days." Gold commented, while a small bell rang from the door opening in front of Mephisto.

"Did you not want the sword, brother? You could have taken it with ease, after all, that man was just a weak human." Amaimon asked, sounding confused as they moved down the streets of town. A few people gave them strange looks, their presences finally noticed by the others.

Mephisto spoke quietly, not wanting to alert the others. "He is more than he appears, a being of that other realm we were in. It seems as if Gehenna isn't the only realm with magic, Amaimon. We are in for a real treat here. Imagine the wonders we'll see once they bring it to this world!" Mephisto insisted, sounding eager for what was about to come.

"So, are we taking the sword later?" Amaimon asked, still interested in what had occurred just moments ago.

Mephisto's eagerness fell just a small amount, leaving the demon smiling at his brother. He gave Amaimon a small nod, glancing back towards the shop as they stopped at the end of the street. "Indeed we will. After all, it is about time we returned it to our dear younger brother, don't you think?"

Amaimon nodded, looking only mildly more interested as he stood next to his brother. "Yes, I believe it is. After all, the sooner he gets his powers back, the sooner we can play."

Mephisto smiled wider, glancing out at the town here. He was glad he left Japan for this, things here were so much more interesting than back home. After all, it wasn't everyday you got to see a demon awaken, especially one as powerful as the son of satan.

(Many years ago, in the Enchanted forest)

Rin knew he had messed up, but it wasn't entirely his fault. He had just been trying to help, but unfortunately, that meant getting on his step-mother's bad side. That was why he was in this prison, a place built to contain even the most powerful of enemies. Regina had claimed to put him here because her other cells were full, but Rin knew better. She was afraid of him, seeing Rin as her son. At one point in time, she had seen a bit of herself in Rin, but the boy had buried his anger and hatred deep down within him.

Now, he was out of options. Shoved into a prison cell, he did his best to try and break free with sheer force. The walls of the cell were supposed to be impenetrable, designed to hold some powerful magic user Rin hadn't heard of before. They held up to that standard, refusing to even budge when Rin slammed his fists against the bars, tearing up his skin and leaving his knuckles bloody as he slumped down to his knees, waiting for some sign that this was just a nightmare.

"Is this really him? To be honest, I'm not all that impressed." a voice called out in the darkness, making Rin's head snap up.

On the other side of a cell was what appeared to be a young man. Rin didn't quite know how to react, considering the guy had green hair. No one had hair like that, and to make it even more ridiculous, the guy had a single green spike sticking out from the top of his head. "Who the hell are you supposed to be?" Rin demanded, seeing the boy crouch down and study Rin for a moment.

"Oh, no one special. After all, I just came to pay my little brother a visit, but it seems I won't be able to do even that right now." the man commented, sounding only mildly disappointed.

Rin frowned in confusion, glaring over at the man. "What kind of an answer is that? I'm not your brother, I don't even know who you are!" Rin shouted.

"For someone so weak, you really do have a loud voice." Amaimon commented, tilting his head as he rose to stand straight. "Either way, I'm not allowed to play with you yet. It seems as if they are still sealed off within you, so I'll just have to wait a little longer. I promise to return later, and then we can have fun together."

Rin stared at him with wide eyes, watching as the man moved to walk out of the cavernous prison he found himself in. "Wait! Damn it, get me the hell out of here at least!" Rin shouted, but it was too late. The other man was gone, and Rin was left alone in the darkness, waiting for a rescuer that would never arrive.

(Today in Storybrooke)

Night had fallen in Storybrooke, and now it was time for the demons to get to work. The pawn shop had only a simple lock on the door, after all, and it was child's play for Mephisto to get inside. "Keep in mind, Amaimon, the people of this town are not themselves. The magic in this place…well, I must admit I'm impressed humans are capable of such powers. No one seems to remember a thing from that other world, and for the time being, it would be best to avoid mentioning it."

Amaimon sighed, nodding in agreement as he stood on the other side of the pawn shop. Mephisto was busy dealing with picking the lock on the display case. "I still don't see what the big deal is. So what if the humans don't remember? Wouldn't that make them weaker?"

"Perhaps, but humans have a nasty habit of surprising others the moment they are underestimated." Mephisto smiled brightly as the case was opened, the lid opening with ease. Inside, the sword was ready for the taking, almost pleading with him to grasp it in his hands. "You'd be surprised how many times the exorcists tried killing me in the past. They really aren't all that fond of us."

"I've never had issues with them. Maybe they just don't like you." Amaimon looked rather uninterested, picking at something underneath his nails as he sat on one of the counters of the pawn shop.

Sometimes, it was hopeless trying to explain concepts to his brother. Lifting the red-cased sword, Mephisto gave a slightly forced smile to the other demon. "That is to be expected, considering you spend nearly all of your time in Gehenna. Tell me, when was the last time you actually visited your domain, brother?"

Amaimon blinked, his head leaning back and staring at the ceiling for a moment. "Hmm…I can't say. Likely around the time Rin was imprisoned I think. Unfortunately, that visit was cut short. You called me to that school of yours, claiming some emergency that had to be dealt with. Did you really need me to cause such a major distraction?" Mephisto only grinned, his teeth flashing towards his brother. That had been an interesting little piece of his game, one to get the vatican looking in the wrong direction. After all, he couldn't have them discovering his weapon before he even began to sharpen it.

"Perhaps if you learned to behave yourself, the distraction wouldn't have been so major." Really, just being spotted would have been enough, but Amaimon had wanted to go exploring. A simple visit to an amusement park had turned into a destructive rampage, nearly destroying the place and closing it down for months while it was under reconstruction. It had been just about to open for its peak season too, so Mephisto wasn't going to take his planned trip there this year. Those rides had always managed to calm him down after a stressful day of running True Cross Academy. "Besides, it got the job done. It wasn't as if Rin would have been all that amusing anyway. He still has no idea of his heritage, despite his potential."

Mephisto began to walk towards the door, slinging the strap of the case over his shoulder to carry the koma sword with him. Pushing the door open, he glanced back and waited for Amaimon to follow. After a moment, the green haired demon glanced over at him, tilting his head before shrugging and jumping to his feet. When he landed, he seemed to spread out his arms dramatically before running towards Mephisto, with an odd energy in his walk. "Oh, you are right about that, brother. Then again, that is why you brought me along now, isn't it? I'm the one that's going to get to test his potential."

"Oh yes. I can't think of anyone else better suited to the task, Amaimon. First, we have this little pesky matter of a curse to deal with, however." Walking out onto the sidewalks, Amaimon blinked at him with a frown. "Breaking it would normally take years to manage, but from my time in this other world, I've come to realize that there is more to this spell than meets the eye. The man who created it designed it to be broken, dear brother."

"And you are going to break it?" Amaimon focused on Mephisto for a moment, watching as his brother began to smile, folding his arms behind his back.

"Oh, heaven's no. That would be a waste of my time, especially with the way exorcists are already concerned about this area. They seem to think the numerous accidents occurring as residents leave town are related to some kind of demonic activity. The sudden appearance of an entire city…well, I don't have to explain what that would cause." He gave Amaimon a slight smirk. "No, the curse can remain in place for all of eternity, for all I care. My focus is going to be on restoring our dear brother's memories…and from there, we can see just how much pressure it will take to unleash his true power, the power he was always destined to wield."

The only noise in the street beyond the wind was Amaimon's clapping and gleeful laughter in response. "Yay! Finally, something entertaining to do." Spinning around, Amaimon laughed again and reached towards Mephisto, trying to grab the sword. Frowning, Mephisto dodged with ease, letting Amaimon pass by him harmlessly.

"All in due time, Amaimon. For now, we must have patience." Glancing over his shoulder, Mephisto couldn't help the smile spreading on his face. "After all, we have just potentially angered one of the most powerful magic users in this town. Perhaps the entertainment from him will be enough to satisfy you until the real challenge can begin."

It took me forever to work out this chapter. Sorry for the delay, but I really wanted to try and use this chapter to pick up the plot a bit more and steer it away from canon events in OUAT. Not that a lot of those things won't be happening, it is just likely that I'll gloss over the drama going on in Storybrooke with Regina/Emma/Henry to focus on different events going on as well. Plus, with the delay, I've realized I can't remember nearly as many specific details of season one of OUAT anyway, so it works out better for me too. I hope you enjoyed! Feel free to review and tell me what you think!