Note: This takes place right after Team Natsu rescues Makarov from Alvarez and Ajeel attacks them - before Laxus arrives to save the day. (Fairy Tail), and during the Battle of Marineford (One Piece), immediately after the escape from Impel Down happened. Since this is a fanfiction, needless to say that I'll make changes to the story to fit the plot, and any plotholes will be explained later on - so please, be patient, first chapters rarely ever manage do fill in every single blank - nor should they. I'll try my best to make it worth your time :)

This is my first crossover fic!

Hope you all enjoy it! Feedback is always welcome :)

• •

• •

The power blast was amazing.

Wendy watched as the member of the Spriggan 12 prepared to attack, looking unconcerned at their group, while Lucy stardressed to Scorpio's form and Natsu and Erza both powered up. The sky dragon slayer herself summoned the air around her, while silently casting supporting enchants on all of them.

The clash happened fast, and as Ajeel summoned a rather huge amount of sand monsters, Natsu and Gray launched counterattacks.

Lucy was about to attack, too, when one of the sand monsters Natsu blew away dropped a red key on her feet. She grabbed it, feeling a huge amount of power coming from it, and noticed a weird symbol on it.

"A red key?" She inquired, analyzing it.

"Tenryuu no Hokkou!" Wendy startled the stellar spirit mage by taking down a sand monster about to hit her. "Lucy-san, be careful!"

Lucy blinked twice to understand the situation, but her mind felt a little too light, and she couldn't really think straight.

"Open: gate of-" Lucy started, and a huge magic circle formed beneath her. Wendy stepped back as she felt the magic coming from it – she had been getting better at sensing those things, or anything else that reflected in the air for that matter.

Ajeel stopped attacking and focused on the blonde, which made the rest of the Fairy Tail mages turn their attentions to her, too.

"Lucy?" Natsu called, frowning. "What are you doing"

"How did you get that key, brat?" Yajeel shouted, launching straightly at Lucy, while blasting a powerful sand attack that sent all the other mages away, including Mest and Makarov.

The attack aimed at her was visibly lethal, but Lucy didn't seem to notice it or mind it. Her eyes were focused on the red key as if she'd been hypnotized.

"Lucy!" Makarov shouted, watching as the sand arrow made its way towards her, and then exploded.

They all waited for the dust to settle, only to find Natsu standing in front of the blond mage, looking all the more enraged. Wendy sighed in relief, but Lucy was still acting weird. It looked as though she was trying really hard to remember something, or focus on something - or at least that was what Wendy thought of the scene.

"the sloth demon, Abaddon." As she finally finished her sentence, both Natsu and Yajeel attacked each other.

What happened then wasn't clear, on even comprehensible, but it changed the mages' lives. The land exploded, creating such a loud sound and incredible visual that people from Alakitasia could hear and see its light. Sorano, waiting on the escape ship for them, felt the sea trembling and a shiver down to her bone. Zeref, watching from afar, not really seeing the fight but the land itself, retreated into a darkness that would later be the fairies very own enemy.

The Fairy Tail mages involved weren't able to react to the explosion aftermath. As it happened, Natsu only managed to pull Lucy and jump to the side, landing near Happy. Erza grabbed Wendy and Carla grabbed Gray, and as a coincidence, or maybe fate's decision, they all jumped towards the same place, landing side by side on the ground.

Still, the explosion was too much for them to escape. Mest was barely able to teleport himself and Makarov to the escape ship – even missing it and landing on the sea – and when the sound and the dust ceased, there was nothing where the fighters once stood.

Nothing but a scarf made of what looked like scales.

• •

• •

Lucy woke up to the smell of sweat and garbage, and the sound of loud and creepy voices. It was noisy, even noisier than the guild usually was, and they sounded a lot heavier and scarier.

Looking up, feeling dizzy and with a huge headache, she realized that she was in a cell, and the noises came from other cells, where prisoners were making a ruckus about her showing up out of nowhere. Some were asking her to strip, others asking for a key, some were just having fun with the noise. Very few were complaining that they were living one very crazy day.

She rubbed her eyes, confused, looking around into her own cell, but it was gladly empty and, to her relief, open. So apparently nobody was being imprisoned in the cell she had fallen into, to her luck.

"Where am I?" She asked to herself, looking at the red key in her hand only to find out, now even more surprised, that it had turned black.

"Hey! Princess! Let us out!"

"Yeah! Let's have some fun!"

"We'll be nice to ya'!"

Lucy tuned out all voices, focusing on the situation and looking around the place. There was a hole in the ceiling, too perfectly done to be from an accident. No, she could tell someone did that on purpose.

The open jail cell plus the hole lead to the easy conclusion that someone had escaped, and that the way out was upwards.

Looking for her keys, she grabbed the one she needed and focused, relieved that she could still feel her magic.

"Open, gate of the lamb, Aries!"

"I'm s-sorry!" The ever so gentle spirit appeared with her signature greeting line. She looked around in fear before turning to Lucy.

"Can you make me a staircase?" Lucy asked, ignoring the surprised prisoners. She didn't need to be a genius to guess that none of them were innocent, if their dirty words were anything to go by.

Aries nodded and made a wool staircase towards the ceiling. Lucy climbed it fast, with the spirit behind her, and they reached the upper level.

... where she almost froze to death.

"How the hell is there snow here?!" She protested, hugging herself as the cold hit her, "the level below was hot as hell!"

"L-Lucy-san, did I do good?"

"What... Yes, Aries, thank you. You can go," she said with a smile, closing Aries' gate and opening Virgo's in sequence to ask for warm clothing.

Once that was provided, Lucy closed her spirit's gate and, now in warm winter clothes, tried to figure out her situation.

She remembered finding a red key in the middle of the battlefield and picking it up. It made her feel lightheaded, weird... as if she were, for a moment, a stranger in her own body. Then, she opened the gate, even though she had no clue of what gate that key was supposed to open in the first place...

And then the world exploded, Natsu grabbed her, and they fell.

How did she end up in a jail cell underground alone?

Just as she started walking again, she heard light steps coming from behind her - and then she heard howls.

• •

• •

The battlefield was one messy and explosive place. Pirates and Marines fought one another until the very last breath, and neither side seemed to gain advantage over the other. Whenever a shichibukai made an attempt on one of the big figures – Whitebeard or his division commanders – another strong pirate would block them. Not only that, but the group shielding Strawhat Luffy also proved to be quite the challenge. Strawhat himself struggled through the battlefield, intent on getting to his brother.

Ace watched everything from above. He watched as his old man tilted the entire island – even the sea – to one side, causing the city to crumble and many marines to lose their balances. Even some pirates, the ones who arrived with Luffy, slipped and fell left and right.

The platform he was held at, however, remained unharmed, as the three marine admirals finally moved, keeping anything from hitting that place. After that, the wall Ace heard them talk about so much finally rose, closing them in and shutting the pirates out of view.

Just then, something fell heavily behind Aokiji, making a crumbling noise on the ground.

"What the hell?!" A marine officer shouted, turning to see what had happened. Aokiji, as well, turned to see what had crashed behind him, and Ace tried to see from his spot on the platform, but the admiral was blocking his view.

"Oh..." Aokiji's ever so calm voice reached his ears, "it is a girl." He commented, and now even Akainu turned around to see what he was talking about. "A little girl and a cat."

"Have you been drinking, Aokiji?" Kizaru asked, also turning around and raising both eyebrows.

"O-Oi, should the three admirals be looking away from the battlefield like that?" A marine officer asked from a place below, sounding nervous. "The pirates are making a path through Oars!"

"It's a little girl with a cat indeed," Kizaru commented, while Akainu turned back around and melted the ice where the pirates were standing on. "I haven't seen her before in the battlefield, have you?"

"O-Ouch..." A female voice made Ace wish he could see the girl. She sounded young. "Where... What..."

She looked up, big, brown eyes facing Aokiji, and then they looked at her surroundings. The cat was safe within her arms, as if it was a plushie.

Her eyes widened when she heard the pirates and marines shouting and then saw the battlefield, with pirates struggling not to drown and to reach the platform.

"Girl, how did you get here?" Kizaru asked in a light tone.

"I... I don't know... Where..." She hesitated, and then looked up, to the platform where Ace was, as if she knew that there would be someone there.

Her eyes widened when she saw the guy on his knees with two men holding swords above him. From where she stood, she could see him, but he couldn't see her. Only blue hair that flew in the wind.

"Don't look at that, he's a criminal," Aokiji spoke, while Kizaru was forced to turn around to manage the situation in the battlefield as pirates approached again.

Just then, a pillar of water fell heavily in front of the three admirals, forcing Aokiji to turn back around, and making the girl jump back, startled.

"IT'S STRAWHAT LUFFY!"

"Girl! Get out of here!" Aokiji spoke, before he moved against the guy who landed on the place, holding a pillar in his hands.

Just then, the cat opened its eyes.

"Wendy?!" She spoke, looking up at her friend, then at the battle ahead of them.

Wendy stared at the entire scenario in awe. She couldn't for the life of her figure out where she was or what was going on. She knew it had to do with the key Lucy had found and the gate the blonde opened, but what happened after that was a mystery to her.

She knew, however, that she managed to fall into a battlefield, one of the likes she'd never seen before, not even during her time in Fairy Tail. There were hundreds of people fighting, killing, shouting war cries. And some seemed to use magic, others used only weapons.

She couldn't feel magic power coming from any of them, though, not even the man currently using ice to fight the kid.

"Wendy! We should leave this place," Charle told her, and she shook her head negatively.

"I can smell the sea all around us," she told the exceed, dodging a scrape of pillar that the boy had kicked all around. His body seemed to stretch and do very weird things, she noticed. "We can't go anywhere, and I don't know if we're close to any other islands, so it's dangerous to just fly off."

"This is dangerous, though!" The exceed protested, as they dodged something else. "What is going on here?"

Wendy looked up at the man, the criminal, in the platform. She could catch pieces of dialogues everywhere, enough to have an idea of what was going on.

"They're going to execute that guy," she told Charle, and she looked up as well. The guy's eyes were fixated on the elastic kid. "He's... I think I heard the word pirate used for his rescuers... I think he's a pirate. These guys..." She showed Charle the men who first talked to her, "they're something called Marines... I think they're the ones going to execute."

"And pirates want to save the guy? Aren't pirates evil?" Charle questioned.

Wendy shrugged. She had never seen a pirate before, there weren't many in Fiore.

"Gear Second"

Just then, the elastic guy's body seemed to change and he suddenly moved a lot faster, surprising both Wendy and Charle. However, one of the men who helped Wendy moved even faster, and managed to hit the guy.

Then she heard the words.

"Proceed," she looked above to see the two men holding the swords begin to lower them. The so called criminal widened his eyes, still watching everything, and Wendy had a strange feeling that something wasn't right.

She widened her eyes, but before the blades hit their target, something threw both executioners away from the guy.

"Wendy! This is dangerous!" Charle protested as a man made of sand suddenly clashed against a man dressed in a weird feathery costume. Just as she agreed and looked for a safer place, the elastic kid was stabbed in the shoulder by one of his opponents.

"Charle, something's wrong," Wendy finally spoke, leaving fear and confusion aside. She could figure out what happened later, right now she needed to survive, and make sure she didn't leave there with a bad taste in her mouth. Charle looked up at her. "They... Do they remind you of anyone?" She asked, pointing at the elastic kid, who, despite being extremely wounded, refused to stay back down, intent on saving the criminal guy... Ace.

She heard the name "Ace" yelled by many people, many pirates, all driven towards the guy.

"Now that you mention it..." Charle frowned, taking in everything "the kid's got the same stubbornness as our guild members."

"They're all fighting to save that guy... Ace," Wendy looked up, again dodging stuff that flew around the battlefield. Nobody targeted her - why would anyone target a young girl who'd done nothing against nobody? - and she could easily dodge anything thanks to her senses - they'd gotten better after a year of training. "They don't care about what happens to them, Charle... I don't think he can be that evil."

"Wendy! You can't just assume things!" Charle spoke, exasperated, knowing what was probably going on in Wendy's mind.

"Nobody evil has that many faithful friends!" Wendy spoke, now with more confidence. Just then, a ship suddenly appeared in the middle of the pirates' area, coming from below the ocean.

"Don't try to interfere!" Charle scolded Wendy then, "we're alone here, and look! They have a freaking giant carrying the ship, and a large mustache man that seems strong! Yet the Marines, as you called them, don't seem to be that much in a disadvantage either. We can't just pick a side carelessly! You're not Natsu!"

Wendy smiled, and Charle knew she picked the wrong words.

"Natsu-san wouldn't have waited enough to make sense of the situation," she agreed, looking up as a man spoke about making a move. "he'd have joined the fight right away."

True, Charle thought, but that's not my point!

"Charle, we're going up there," she looked at where Ace was, determined to do as she said. "I want to talk to him."

Charle nodded, ignoring the urge to point out that there were crazy strong people fighting and she was acting as if they weren't in danger. There was a man using earthquakes going up against one who used ice magic, as powerful as Gray's! It was just like Wendy not to care about that - she'd been under the influence of Fairy Tail for too long, Charle thought.

Charle flew her up, from behind the platform, so few people would see them. However, the two men standing up there did see them when they landed.

"Is she the girl Aokiji was going on about?" One of the men inquired, approaching her, unafraid. "Kid, this is no place for you, go back down!"

"Don't tell me she's in Whitebeard's crew too," the other man spoke to Ace, who turned his head around to face Wendy, seeing her for the first time. He frowned, surprised to see someone that young there. "The cat's a zoan type, too, apparently."

"Never seen her in my life, gramps," Ace told the man, and Wendy's eyes widened.

"He's the only brother I've got in this world!" At these words, Wendy's head changed from Ace's direction to the battlefield, and she saw the elastic kid in terrible conditions, in the hands of pirates who seemed to try and help him - against his will.

"Brother?" She repeated the word, looking back at Ace. Now everything made sense. "You're his brother?"

"The world's learned of that today already, don't act like a fool," he spoke to her in a cold voice.

"Hey! Don't be rude!" Charle scolded him angrily.

"He's too hurt, Wendy," Charle commented, looking at the elastic kid who couldn't seem to stay still. His recklesness and stubborness reminded Wendy of someone else, and she smiled at the thought. "They won't make it!"

"The cat's smart," the grandfather spoke before jumping down and attacking some pirates. Judging by everyone's reaction, he was quite legendary, Wendy noticed.

"Kid, I don't want to attack you," the remaining marine told her, and she sighed. "Leave the platform."

"Sorry, sir," she spoke in her ever so gentle voice, and that seemed to surprise both him and Ace, "I don't think he should die."

"O-Oi, kid..." Ace called, now staring at her, "don't be crazy! You'll die!"

Wendy smiled, and they both watched as the air seemed to get agitated around her.

"Charle. We're saving him!"

N/A: soooooo, I know there's too much dialogue here, but I tried to cut as much as I could. This chapter follows chapter 567 of One Piece, with slight changes so Wendy can meddle there. The story will pass from Fairy Tail's point of view in these next two chapters - and then shift to One Piece's characters point of view. I'll try to make it as entertaining as possible, and they will, of course, eventually meet.

I'm always open to feedback, so feel free to leave some. :)