Luffy Twin Brother: The Monkey King

"Grandpa! A little help here!" Lucy called out, It didn't take long for Garp to arrive, stomping toward the sound with his usual grumpy scowl. But the moment his eyes landed on Lucy, his soul almost left his body.

"L-Lucy?!" Garp's jaw practically hit the floor, eyes bulging like they were about to pop out of his skull. Under normal circumstances, Lucy would've laughed his ass off at the sight.

Garp's gaze snapped to the half-eaten fruit lying nearby. He didn't need an explanation. Everyone knew the rule—one bite. That was all it took to inherit the powers of a Devil Fruit. Seeing the untouched portion of the fruit and Lucy's current state, Garp instantly pieced it together.

"You dumbass! Do you just eat anything you come across?!" Garp roared, his face red with fury. Before Lucy could explain himself, Garp's fist came down like a sledgehammer, slamming into Lucy's liquefied form.

"AHHH!" Lucy screamed, his liquid body rippling from the impact. "How are you even able to hurt me?!" Ignoring the question, Garp reached down and grabbed Lucy—grabbed, like he was still solid.

Lucy's eyes widened in shock. 'How is he holding me?! I'm liquid!'

But under Garp's iron grip, something even stranger happened. The chaotic, formless state of his body began to stabilize. It was subtle at first, but within seconds, the liquid hardened and pulled itself back together. With a gasp, Lucy found himself back in his normal form.

Well, almost normal. Parts of his body still looked off—his arms stretched slightly longer than they should, and his legs had a strange elasticity, not unlike Luffy's rubbery limbs.

"I'm taking you two somewhere else to live. It ain't safe here anymore." Lucy barely had time to process those words before Garp yanked Luffy out of a nearby tree—where the rubber boy had somehow managed to get himself stuck, flailing helplessly.

"Lucy, what happened to you? Did you also get the Gomu Gomu no Mi?" Luffy asked, confused by Lucy's rubbery appearance.

"Nope," Lucy replied, flexing his fingers and watching them stretch slightly. "I found a fruit that looked like the Henkan Henkan no Mi, but I must've been mistaken. That fruit should've only let me reshape my body into solid forms, not turn into liquid."

He frowned, wanting to get back home and check his book. Something felt off… and why did he suddenly feel more playful and energetic?

Luffy had changed a little after eating his Devil Fruit. Was the same thing happening to him?

***

After some time, Garp brought the twins deep into the forest on Mt. Colubo. This mountain, towering over Foosha Village to the north, was home to countless deadly animals. It was the kind of place most people avoided unless they had a death wish. Yet, despite the danger, the peaceful forest was anything but quiet.

"I want to be a pirate! Pirates are cool, unlike those dumb, stupid Marines!" Luffy yelled, thrashing around in Garp's grip like a caught fish.

Lucy, on the other hand, barely paid attention. He was too busy fiddling with his hand, slowly getting the hang of his new power. Bit by bit, he learned how to shift between liquid and solid, the strange ability becoming less awkward with each attempt.

"Shut up!" Garp barked, his grip tightening on Luffy. "Those damn pirates filled your head with that stupid treasure nonsense! I thought leaving you in that peaceful village would protect you, but no—those idiots just had to ruin it! I forbid you two from ever going near Red-Hair again. You Three will become fine Marines one day!"

Luffy, refusing to back down, stretched his arm out and wrapped it around a nearby tree. "No! I'm gonna become just like Shanks one day!"

Garp didn't even flinch. He kept walking, completely unfazed by the resistance. The result?

CRACK!

The tree ripped clean out of the ground, roots and all, flying straight into Garp's head with a heavy thud.

"You little!" Garp growled, eyes twitching from rage.

"What do you mean by three?" Lucy asked, picking himself up off the ground after Garp had dropped him, thanks to the flying tree incident.

"You'll find out soon enough," Garp grunted through gritted teeth, clearly still annoyed. Without another word, he stomped up the hill, leaving the twins to scramble after him.

Lucy sighed, reluctantly giving up on his training for now. Trying to control his body while walking was harder than he'd expected—every time he lost focus, parts of him would start to ripple like liquid. Frustrated, he settled on just keeping himself normal for the time being.

After a short hike, they reached a small house nestled deep within the forest. It looked worn but sturdy, surrounded by thick trees and faint traces of wild animals passing through.

Garp wasted no time. He marched straight up to the door and started knocking. no, pounding, without pause.

BAM! BAM! BAM!

"Oi! Open up!" Garp barked. The door flew open, revealing an enraged woman with dark hair and a sharp glare.

"What the hell is your problem?!" she snapped, already gearing up for a scolding—until her eyes landed on Garp's narrowed gaze.

The woman standing in the doorway was tall, overweight, and middle-aged, with long, curly orange hair framing her big, masculine face. A cigarette dangled from her lips, smoke curling lazily around her head.

Behind her, two men stepped into view. The first was a super short man with a sword strapped to his back, his sharp eyes flickering between Garp and the twins.

But it was the other man that caught Lucy's attention. He was tall, lanky, and—odd. His bald head had a comb running down the middle like a rooster, and what looked like a wattle dangled from his chin. A mustache and thick sideburns framed his face.

"Nice to meet you again," Garp said calmly, hands slipping into his pockets as if they were old friends.

"Sorry for the cold welcome, but I hope you're not here asking for another favor," the woman grunted, cigarette bobbing between her lips. "You do know Ace is ten years old already, right?"

That caught Garp off guard. "Ten? Already? How's the little brat doing?"

"He's a handful," the short man muttered. "We've been watching over him since he was a baby. It's about time you took him off our hands."

While they spoke, the woman's sharp eyes drifted toward Luffy, who was running around in circles like a headless chicken, laughing and yelling without pause. It was like the Devil Fruit had supercharged his already boundless energy.

"Speaking of brats," she growled, glaring at Luffy, "can you shut that one up?!" Her tone held no patience, and Lucy couldn't blame her. Luffy was annoying.

"Well… they're yours now," Garp said casually, grabbing Luffy by the shirt.

Lucy barely had time to react before Garp snatched him up too, holding both twins like a pair of stray kittens.

"This is Lucy, and that's Luffy. Say hi," Garp grunted, eyeing the boys like a shopkeeper showing off merchandise.

Normally, it was hard to tell the twins apart—they looked nearly identical. But now? Luffy's straw hat and the scar under his eye, a souvenir from when he cut himself to "prove he was a man," made it a lot easier.

Luffy grinned, completely unfazed. "Yooo!" he said, waving lazily.

Lucy shrugged. "What's gooood?" he added, mimicking Luffy's wave.