This story was requested by animelovergirl123, who also provided the plot overview/synopsis!

Takes place post-timeskip, before Punk Hazard.

"WAIT, YOU IDIOT!"

Nami's shout went ignored as Luffy rocketed himself into the trees on the island they'd docked at. She groaned and hung her head. "He hasn't changed . . ."

"I dunno what you expected," Usopp remarked.

"Since when has he ever changed?" Zoro pointed out.

Nami glared at them. "I do not need your sass right now."

"Yeah, you two, quit giving her lip," Sanji snapped. When Nami smiled gratefully at him, he had to stifle a nosebleed.

Naturally, Luffy wasn't hurt at all when he crashed headfirst into a tree. He straightened up and looked around.

"Cool island, cool island," he sang to himself happily. "Gonna go exploring!"

He marched off through the trees, ignoring the potentially dangerous animals he passed. If one of them attacked, he simply made it back down by glaring at it, and it would meekly slink away.

Not much time passed before he came upon a large tree. The leaves were dark green, and on a low-hanging branch, the tree bore a single fruit. It was shaped like an apple and smelled very sweet, almost dizzyingly so.

"It must taste good," Luffy murmured, staring at it. He reached up and plucked it off the branch, biting into it and finishing it off quickly. It tasted as sweet as it smelled.

"That's the best fruit ever," he whispered. "I wish there were more . . ."

He looked at the tree regretfully before moving on with his trek.

By the time he made it back to the ship, his insides were feeling very strange, like someone was reaching inside of him and twisting and shifting and rearranging all of his organs at once.

"There you are," Usopp called, returning from a different part of the island with Sanji. "Where have you been?"

Luffy opened his mouth to reply, but then winced and doubled over.

"Hey, you aren't hurt, are you?" Usopp asked frantically, hurrying over with Sanji. They checked him over.

"My guts . . . hurt," Luffy groaned.

"O-Okay, we'll get you to Chopper," Usopp said.

"You feel up to having dinner?" Sanji asked. Luffy shook his head and Sanji immediately became concerned. "Okay, you're definitely sick. CHOPPER!"

"It seems to be just a stomachache, but I'll keep him in the infirmary just in case," Chopper announced at dinner as Luffy rested in his office. "I'll ask him later if he ate anything funny."

"I keep telling him not to eat weird things," Sanji muttered.

Brook chuckled. "No one can stop him once he's set his sights on something."

"All too true," Franky muttered.

Luffy woke up once in the night, feeling like his chest was on fire. He lay awake for a long time, his torso burning, before he fell back into a fitful sleep.

Morning dawned and Chopper woke up curled up on the ground in his office, where he'd stayed for the night in case Luffy needed anything.

"Mornin', Luffy," he said sleepily, sitting up. He jumped to his feet and looked at his patient. "How's—"

He cut himself off as Luffy sat up. Luffy's hair hung down to his shoulders in loose waves. From his chest protruded a pair of breasts, barely covered by his shirt. His waist seemed a bit slimmer and his hips slightly wider.

"Mornin', Chopper," Luffy said cheerfully in a slightly higher-pitched voice than usual. "I feel way better!"

Noticing Chopper's expression, s/he frowned and said, "What's wrong?"

Chopper started screaming. Luffy frowned, looked down at his/her body, and started screaming as well in perfect harmony.

This chorus of screaming was what the crew got to wake up to.

The next chapter's gonna be on a Thursday, but all following chapters will be on Wednesdays.