Author's Note: Hey guys! I'm just writiing this fic since I thought it'd be fun and amusing to start one with this sort of plot in the (hopefully) long run. So, do be aware of any incoming grammatical errors and the sort! Enjoy!

Disclaimer: I do not own One Piece or any of its characters.

A New Change

Chapter 1: The Change

"SANJI! FOOD!"

The cook grimaced at the loud exclamation near his ear and snapped at his captain in annoyance, "YOU DON'T HAVE TO YELL IT!"

Luffy could only grin widely at Sanji with delight, "Thanks!" He then followed the blonde into the kitchen with anticipation, but another voice called out to him from the deck.

"Oi, Luffy! Don't you think you should rest? We just left Suru island, you should let your body to heal from that last battle," Usopp looked over at him with hands resting at his own hips in a parent-like pose. His attention was then grabbed from a hand being placed at his shoulder. Turning over, he saw Nami shake her head before sighing, "Forget it Usopp, he won't listen no matter what we say. We have a meat-head for a captain, it's hopeless."

"Nah! All I need is meat to help!" the simple-minded boy then returned to head into the kitchen in excitement.

"See?" Usopp's shoulders sagged at the childish answer and sighed alongside their navigator. Chopper sat on one of their benches beside a sleeping Brook and sipped his strawberry milk box.

"Don't worry, Luffy's wounds have been tended to. It should only take about a few hours at most for him to be at 100%, considering his ridiculous healing factor," the reindeer stated as he kicked his feet playfully.

"True," Usopp smiled funnily at the reminder.

"We do have one crazy captain."

Robin, who sat from another spot of the ship, chuckled at the statement. She held her book back up with a small smile, "That we do."

The sharpshooter then took a moment as he looked back at a particular memory from the island, when they went to retrieve their captain.

He remembered the young man practically swallowing a basket of strange looking fruit in a hurried motion to regain energy. Those fruits… I've never seen them before.

Luffy sat at the booth of the kitchen excitedly, hands holding a fork and a knife with a steel-like grip.

"Food! Food! Food! Foo- "

"Be quiet already! It's almost done you idiot!"

"Shishishishi! Yay!" Luffy couldn't contain his smile at the news. He then briefly paused as he felt something shifting within himself, it was an odd sensation. Maybe cuz I'm hungry?

His thoughts were broken once a very familiar and delightful smell reached his nostrils, turning his attention back to a plate that now sat in his presence. His eyes turned into sparkles at the sight and drooled happily, "YAY! FOOD! Thanks for the meal!"

Sanji huffed out from his withering irritation and simply watched as his captain ate the abnormal amount of food in front of him. "You're a piece of work you know? But I guess I signed up for that," he smiled slightly and went to wash some dishes.

As Luffy ate in bliss, the shifting sensation from previously returned again. He ignored the feeling since food was the most important thing to him right now.

His physical form began to slowly change. Toned muscles remained as broad shoulders shortened, waist slimming inwardly and hips taking a curvy outlook alongside his bottom. Legs and arms became those of womanly physique, and his chest grew in unfamiliar weight.

While this strange event took place, Luffy continued to eat without delay, mind obviously preoccupied by intaking delicious food.

"Oi Luffy, I'm making rearrangements for dinner tonight."

"I know you'd eat anything but," Sanji washed his hands and dried them off before turning to look at other, "I just want to let you know that we'll be havi— "

What laid before him was not Luffy, but a gorgeous maiden. Sanji took a second to blankly stare at his captain before his eyes blew out of their sockets in heart shapes.

"B-B-BE-BEAU—!"

Lush lashes that were not present before now lifted upwards, unveiling large and alluring eyes. A petite nose and plump yet small lips motioned alongside the chewing. The doll-like features were framed by a heart shaped face, which tilted at Sanji in a questioning gesture.

"BEAUTIF— "The shocked cook turned into stone.

Luffy simply watched as the blonde took form of a statue. "Shishishi, you're weird Sanji!"

"Hey Nami! Where are we going next? Also, Sanji's acting pretty weird."

"Oh, you're out already? Well the log-pose says—" the navigator finally rested her eyes on Luffy. Except it wasn't Luffy, or so it seemed. "!" Nami proceeded to pull out her clima-tact, cautiously taking on a battle stance.

"Who are you?!" alarm was clear in her tone when she noticed the girl came from the kitchen, quickly looking around to see no one else but herself. "What have you done with Luffy and Sanji?!"

"Hah? Nami did you hit your head or something?" Luffy looked at her with an odd expression as the others came rushing in from the sudden outburst.

"Nami! What's wro— WOAH! LADY BUTTON UP YOUR SHIRT!" Usopp's eyes bugged out momentarily before shaking his head immediately. "Wait—! Where did she come from?!"

"I don't know! That's the thing! All I know is that she came out from the kitchen, where Luffy and Sanji were supposed to be," Nami glared at the girl who stood laxed before them, confusion plastered on her face.

"You guys are acting weird too! Just like Sanji, except he's like a statue now. Really weird… wait— ARE WE PLAYING A GAME?"

"NO YOU IDIOT!" they two crewmates yelled in unison. "And what do you mean Sanji's a statue?!"

Chopper peered over before hopping off the bench in alert, "an intruder?!"

A door from above swung open from one of the rooms, revealing a familiar green haired swordsman who glowered at the new appearance. A hand resting readily at his katanas, "I was just exercising too, tsk."

"What's with all the noise? I could hear you all from my station," Franky called out from below and walked up to where everybody else was.

Brook's sleep bubble popped at the abrupt ruckus, "Ah." He looked at the others gathering together at the deck in question, "What's going on?"

Nami continued to stare at the woman hard despite everyone's questionings. Then a realization slowly hit her from previously. "Hold on... how do you know my name? And Sanji's... —"

Robin remained in her spot, glancing at the scene and smiling knowingly. "Navigator-san, I would take another look if I were you."

"What? Robin what are you—" Nami blinked at her in confusion before looking back at Luffy again. The eye scar. The chest scar. The outfit. That hat. And especially the girl's familiar idiocy. Suddenly the orangette felt like a boulder of stupidity fell on her shoulders.

"LUFFY?!"

"EEHH?! THAT'S LUFFY!?" The rest of the crew yelled in response.

Luffy grinned brightly at them, still confused at their odd reactions. Though, happy they were gaining their original characters back. "Yes?"

"YOU'RE A GIRL!"

"Huh? Hm… Now that you say it. My chest does feel a bit heavier than usual, and the rest of my body does feel a little weirder."

Nami face palmed at their captain's obliviousness, clearly not being able to see the extent of the boy's— now girl's— ignorance. "First off, button up your damn shirt!"

"Ah, oh yeah!"

Usopp sweat dropped at that, "L-Luffy, when did— I mean how…?" Then he paused temporarily, the memory from before coming back to him. The fruit.

Franky whistled low at the new appearance and grinned, "Wow, who knew our captain could be so cute as a girl? I feel like I have a little sister now!"

Chopper nodded in agreement, still having a hard time accepting the fact that this young woman was really their captain. He stared at her in awe, and Brook who stood alongside him shared the same look. "I… I should probably go check on Sanji. I don't see him here yet." Though before that could happen, the musician spoke.

"L-Luffy-san, I never thought I'd say this but… May I see your panties?!"

Luffy blinked at the skeleton weirdly, "But I'm not wearing any."

The others choked at the blunt statement and Brook was sent flying backwards with a massive nosebleed. How does that even work for him?

"B-Brook!" Chopper worriedly ran to the skeleton to check over him.

"It was the fruit back from the island!" Everyone then looked over at Usopp's exclamation, seeming puzzled. "Fruit?"

Nami growled as she then walked over and harshly pulled one of Luffy's ears, "Did you eat something ridiculous again?!"

"Ow ow ow ow—! I-I don't know! Yes?! Maybe?! Food's food! As long as it's delicious it doesn't really matter does it— OUCH!" The captain yelped as her navigator stretched out her ear with an irritated expression.

"YOU DON'T JUST EAT EVERYTHING THAT'S EDIBLE YOU IDIOT! Now look what you've done! We don't even know if this is reversible!"

"So what?! I'm still me! I can still fight! Even if I'm a girl, I'll still become the pirate king!"

Nami paused momentarily before sighing in defeat, letting the young lad go.

"At least nothing terrible happened, but you still have to be careful with your actions! Who knows what else could've happened."

Luffy pouted as she nursed her ear, "Sorry."

Usopp rubbed his chin in thought, "I wonder what kind of fruit it was though… I don't remember ever seeing something like it even at Greenstone island. We could return to Suru and try to see if anyone knows anything about it."

"No, we should keep moving forward!" Luffy pointed towards the vast sea ahead of them in determination, "This is nothing, we can worry about it later!"

Usopp made a small face at that, "You say that now but…"

Robin turned a page in her book without looking up, a smile still apparent on her face, "I'm sure we'll find a way eventually to turn our captain back."

The sharpshooter scratched his head in unease but let it go. The swordsman on the other hand, simply shrugged off the news.

"As long as he's still Luffy, I don't really care." Zoro then returned to his room to resume his exercise routine. Brook wiped himself down while getting back up, "That's true. Despite the changes, I'm sure Luffy-san will always be Luffy-san."

Franky then began to go back to his post as well, waving them off. "Well then, I'll be down in the development room experimenting with new additions for the Franky Shogun if anyone's interested!"

Luffy, Usopp, and Chopper's eyes sparkled at the announcement in excitement, "Franky Shogun!?"

"I wanna see! I wanna see!" Luffy ran over enthusiastically as Usopp joined in, "Count me in! I can't wait to see what new designs you're planning for it!"

"Aah I really want to go too! But I have to go see Sanji first to see if he's alright. Knowing he saw Luffy like this first, I'm sure he's not okay!" Chopper proclaimed as he hurried into the kitchen with Brook following from behind.

"I'll come with you Chopper-san! I wish to make some tea for the afternoon."

Once everyone was back to their regular pace, Nami walked over to Robin's spot and sat in the chair beside her. "Goodness, we don't even know what's going to happen from now on."

Robin could only hum in amusement at the navigator's comment.

"Hasn't it always been like that?"

A quiet moment passed as Nami looked up at the sky. A small grin formed on her lips as she rested her hands behind her head.

"Yeah, you're right."