This is gonna be a pretty short story, but I did enjoy writing it and I hope you enjoy reading it!
"ISLAND!"
Luffy's joyous shout rang throughout the ship, and the Strawhats gathered on the deck. The sun was beginning to set, casting orange light over the thick jungle of the small, sandy island.
"Yes, Luffy, thank you," Nami said, patting his shoulder. "We can explore tomorrow, got it? It's already getting late, and—"
She looked around and spotted Luffy running into the trees.
"Luffy!" she yelled, but he was gone. She hung her head.
"Oh, he'll be fine," Zoro said dismissively. "Worst-case, we can go look if we hear yelling."
"Okay, but what if there are wild animals or something in the woods?" Usopp exclaimed, peering into the trees. "And what if one of them eats him, and—"
"He'll be fine," Franky said, clapping Usopp's shoulder.
Luffy looked curiously at the thick, curtain-like vines hanging from a tree branch. He brushed them aside and went past, finding himself in a moderately-sized, shaded area, completely blocked off by trees, bushes, and vines.
He grinned and looked around. "A secret place!"
And then he spotted something in the center.
"What's that?"
"See, Usopp, he's fine," Zoro said, cutting off Usopp's rambling of some story about a man made of rubber who wandered into a forest alone and never returned.
Usopp looked over the railing to see Luffy coming out of the trees. "Oh, yeah, he—LUFFY, NO—"
But Luffy had already rocketed himself onto the ship, crashing into Usopp and bringing them both to smash into the railing.
"Luffy, you have to stop doing that," Usopp grumbled, brushing himself off.
Luffy laughed, brushing away some debris from his face and scratching the old scar under his right eye. "Sorry!" he said cheerfully without a trace of sincerity.
"Dinner's almost ready, by the way," Zoro said, helping Usopp up.
Luffy sniffed the air and began to drool, but he shook his head and looked at Zoro, grinning. "Before that, Zoro, can I show you something?"
"Sure," Zoro said, folding his arms.
Luffy laughed. "No, it's in the woods! I found a really cool thing! You gotta see it!"
"What is it?"
"It's a surprise," Luffy insisted. "Come on, follow me!"
He jumped off the ship, and Zoro shrugged and followed. "Tell the cook we'll be back soon," he added to Usopp.
Luffy and Zoro returned just as Sanji called everyone in for dinner. They sat at their usual places.
"So, what was the thing?" Usopp asked.
Zoro scowled at Luffy. "Well, I'll tell you this much: It wasn't that cool."
Luffy pouted. "Yes, it was. You're just no fun."
"I just don't want to waste my time with stupid things, unlike some people on this ship—"
"Nami, Zoro's being mean, make him stop," Luffy whined, turning to her.
"Zoro, don't be mean to Luffy," Nami said with a teasing grin. He rolled his eyes, readjusting the swords dangling from his left hip.
"Fine, whatever," he muttered. While his left hand was busy, he used his right to pick up his plate and hold it out. "Hey, cook. Seconds."
At Sanji's silence, the others looked around. He had been staring at Zoro for quite some time, eyeing him with an odd look in his eye.
"What, is there something on my face?" Zoro demanded.
"Yeah," Sanji said at last. "That ugly mug of yours."
Zoro threw the plate at him, scowling. Sanji caught it easily and went to serve up more food. He set it back in front of Zoro, now glancing at Luffy.
"Oh, I want seconds, too," Luffy said cheerfully, holding up his plate which he'd licked clean.
"Yeah, yeah, coming up," Sanji muttered.
Morning dawned with Sanji's call to breakfast, and everyone rushed to the kitchen. The usual praises and delighted chewing filled the kitchen, though Sanji, rather than smiling, eyed Luffy and Zoro in the same way he had the previous evening. He barely seemed to notice the girls, automatically doing what they asked without his cries of "Nami-san" and "Robin-chan."
Everyone dispersed around the ship following the meal, but Luffy and Zoro caught Usopp and Sanji alone near the railing.
"Guys," Luffy said in an excited, hushed tone, his eyes shining. "Me n' Zoro wanna show you the thing I found yesterday!"
"Is that so?" Sanji murmured. He shot a glance at Zoro. "Didn't you say you weren't interested in stupid things?"
Zoro shrugged. "Changed my mind, what can I say? We're serious, it's actually pretty neat."
"Yeah, sounds like fun," Usopp said, grinning. "Let's go!"
"Alright, fine," Sanji said. "Lead the way, Luffy, just don't let that guy get lost."
Zoro scowled, but a look from Luffy broke up the would-be fight. He jumped off the ship, Zoro close behind and Usopp and Sanji not far after.
"You guys are gonna love this, you'll see," Luffy said cheerfully as they walked.
"I just wanna know what it is," Usopp said.
"You'll see, don't worry," Zoro said.
Sanji let his steps slow until he was trailing a few meters behind Luffy and Zoro. He tapped Usopp's shoulder, and Usopp hung back until he was next to Sanji.
"Usopp," Sanji said under his breath. "Something's wrong."
"Huh?" Usopp whispered.
"What side are that swordsman's earrings on?"
Usopp glanced up. "Left, aren't they—?"
Golden earrings dangled from Zoro's right ear.
"Was that wrong?" Usopp whispered.
Sanji shook his head. "And Luffy's scar . . . isn't usually under his right eye. Not to mention that those swords should be on the right side, not left."
Usopp squinted at Zoro. Come to think of it . . .
"He . . . switched the side?" he whispered. "Why?"
Sanji shook his head. They were approaching thick, curtain-like vines.
"It's in here!" Luffy declared. He began to push the vines aside, but paused and turned. Sanji and Usopp were standing still.
"Guys?" Luffy said. "What's up?"
"It's not scary, you wimps," Zoro said, rolling his eyes.
Sanji glared at each of them in turn. "Who are you?"
They glanced at each other.
"Sanji," Luffy said seriously, "do you have amnesia?"
"What did you two do with the real ones?" Sanji demanded, shifting in front of Usopp.
"Real what now?" Zoro said, scratching his head.
"You know what?" Sanji said. "Why don't you two show us what's behind those vines?"
Luffy smiled. "That's what we were trying to do."
Sanji shoved past him, dragging Usopp with him, and went beyond the vines. He cast his eyes around and settled on something in the center of the clearing. His eyes widened.
It was a mirror. Even when Sanji stood in front of it, he could see neither himself nor Usopp, though the plants in the background were reflected perfectly. And there, inside the mirror—there were Luffy and Zoro, their scars and accessories in the correct places.
When they saw Sanji and Usopp, they began waving their arms frantically, banging on the glass on their side, yelling something—but Sanji and Usopp could hear nothing from their side.
"It's your turn."
They turned around just as Mirror Luffy grabbed Sanji and Mirror Zoro seized Usopp. Usopp screamed and wiggled frantically—and he was suddenly released. He looked up to see Sanji lowering his leg; he'd used a powerful kick to make Mirror Zoro drop Usopp.
"Usopp, RUN!" Sanji yelled. "I'll get away, don't worry! Tell the others what happened!"
"Okay!" Usopp cried, scooting back and standing. "Sanji, be careful, please be careful!"
He turned tail and ran, leaving Sanji struggling behind him.
"GUYS!"
Nami, Robin, and Chopper, on the deck, looked up at Usopp, who had just leapt onto the ship, panting hard.
"Yes?" Nami said, lifting her sunglasses.
"Guys, terrible news, it's awful," Usopp cried, eyes wide with fear. "Luffy and Zoro got replaced with evil mirror versions of themselves, and they tried to do the same to me and Sanji!"
"WHAT?!" Chopper screamed, jumping up in panic.
"Chopper, calm down," Nami said. "Usopp, don't scare him with tall tales."
"What—?" Usopp spluttered. "No, I'm serious, the real Luffy and Zoro were trapped in the mirror, I dunno how to save them but we gotta hurry—!"
"And where's Sanji now?" Robin asked, seeming unconcerned.
"He—" Usopp gulped. "That evil Luffy had him, he told me to run and warn you guys—"
"So you're saying Luffy and Zoro got trapped in a magic mirror?" Nami asked, all but rolling her eyes. "I'm pretty sure magic mirrors aren't real, first off. I'm not saying those two aren't dumb enough to fall for that kind of trap, but you can't fall for something that doesn't exist, Usopp."
"Oh, so it's not real," Chopper said happily. "Geez, Usopp, don't scare me like that!"
Usopp looked over the railing. "Where is he?" he said frantically. "He said he'd be fine, why is he taking so long—"
A blond head of hair emerged from the trees.
"Sanji!" Usopp yelled happily, waving his arms.
But behind Sanji, two figures, one with dark hair and one with green, followed. And as Sanji got closer, Usopp's eyes widened, his voice catching in his throat.
Sanji's hair was combed over the right side of his face.
We'll be updating Wednesdays!
