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Overpowered From the Start With a Slave Harem in One Piece

Tungsten_Bayonet
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Synopsis
After stumbling upon a mysterious genie on a rainy beach, Omen D. Ickford is granted six wishes, and uses them to transmigrate into the world of One Piece with one goal in mind: to build the ultimate sex slave harem. Gifted with overpowered abilities like teleportation, time-stopping, and the power to twist reality itself through “Normalcy,” Omen reshapes the pirate world to suit his every depraved desire. Now known as "Captain" aboard the Going Merry, Omen rewrites the Straw Hats’ reality so they see him as their rightful leader—and their women as his personal toys. With Nami as his first loyal slut and recruiter, he sets his sights on new targets; Omen’s growing influence threatens to reshape the Grand Line into his personal fuckfest. This is a hardcore smut fanfic set in a twisted version of One Piece, filled with harem building, mind control, moral corruption, reality manipulation, and raw, violent sex. This fic was inspired by: Omnipotence, Omniscience, and Raping Supers in DC
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Chapter 1 - Overpowered From The Start With a Sex Slave Harem in One Piece

Alone inside a modest house in Cocoyasi Village, East Blue, Omen D. Ickford—also known as Portent—sat at the kitchen table, sipping coffee and eating a lunch made entirely of stolen food. 

The place was quiet except for the soft clink of his spoon hitting the plate and the occasional breeze pushing the curtains. He wasn't worried about being found. 

The locals were busy celebrating their freedom, cheering and dancing now that Arlong was dead. That meant the Straw Hats had just finished their raid, which also meant it was almost time for Omen to make his move.

Two months had passed since Omen transmigrated into the world of One Piece. One rainy morning, back in his original world, he'd been walking along a beach when he stumbled on something buried in the sand. 

It was an old, crusty lamp; after Omen rubbed it without thinking, and sure as shit, a genie popped out. The genie looked like he had just taken a nap and was in a weirdly good mood and said he hadn't been trapped that long, so Omen got six wishes instead of three.

Omen was tall, 6'3", with broad shoulders, lean muscles, and a kind of quiet menace in the way he moved. His skin was light, his hair long, straight, and dark, and his black eyes looked sharp under soft, smooth features. He didn't have a beard or any chest hair; if he did, he would be closer to a bear than to a man.

He had used his wishes wisely—or selfishly, depending on who you asked. First was teleportation, which let him go anywhere in the world as long as he had a strong enough mental image of the place. It was tied to his Observation Haki, meaning the more he trained it, the better and faster he could move. Second was Normalcy, a broken ability that let him rewrite how the world worked, but only within reason. The genie said he couldn't give full reality manipulation, but Normalcy was close enough—it let Omen declare something as "normal," and reality would shift to accept it as if it had always been true.

His third wish was the ability to stop time, but it was locked behind Conqueror's Haki, which he hadn't awakened yet. The fourth was Telekinesis, tied to his Armament Haki. And the last was his favorite: the ability to gain the powers of any devil fruit used by a woman he had sex with—and share those powers with whoever he wanted.

Getting to Cocoyasi Village had been a pain in the ass. Sailing without a navigator meant constantly getting lost, but Omen kept track of the timeline as best he could. 

He knew he had to get there before the Straw Hats left. And now, judging by the sound of cheering in the distance, he'd made it just in time.

He stood up, wiped his mouth, and then shoved a few coins and a ring into his pocket before walking out of the house. He strolled through the streets as if he owned them, his eyes scanning until he saw the Going Merry slowly drifting off in the distance. He stopped, closed his eyes, pictured the ship's deck in full detail, and then—bam—he teleported there.

He landed on the wood with a soft thud as all the straw hats went about their business; Zoro had a sword across his back, and Sanji was lighting a cigarette. Usopp flinched as Omen landed, and Luffy was sitting cross-legged, grinning like an idiot, while Nami turned, blinking in confusion that didn't last long.

"It's normal for you to treat me as a second captain, higher in authority than Luffy," Omen said calmly, with no emotion behind.

The Straw Hats didn't react as one would expect; they all smiled and nodded as if they had known him for years. "Second captain! You're back!" Luffy said with a dumb laugh. Zoro gave him a nod, and Nami smiled like she'd always trusted him. 

The power of Normalcy made it so none of them questioned anything—they simply accepted it as how the world had always worked.

Omen cleared his throat. "Crew meeting," he said, and they all gathered on the main deck.

He looked directly at Nami especially. "From now on, it's normal that all female crewmates are my personal sex slaves. No man touches them. That's the rule."

They all laughed as if it were common knowledge. "Of course, second captain," Sanji said, without an ounce of resistance, even Nami giggled and rolled her eyes like he'd said something obvious; In their minds, nothing had changed.

"Alright, just so we're all clear," Omen said as he stood in front of the Straw Hats with his arms crossed. "I might be the highest authority on this ship, but I'm also fucking lazy, so don't expect me to get involved in anything unless it's actually serious."

He looked over at Sanji, who was still puffing on his cigarette, standing near the kitchen entrance. "And while we're on the topic—Sanji, I expect the best meals on this ship, pure quality; make sure there's always plenty of meat and protein."

Sanji nodded with no argument in his voice. "Of course, second captain. You'll get nothing but the best."

"Just Captain," Omen kept going without slowing down. "Also, from this point forward, it's normal for all of you to follow my instructions blindly, with no debates or delays, unless you somehow have a better idea than mine—and I doubt that—you follow what I say. Got it?"

"Got it," they all echoed, like soldiers being given orders.

Omen's eyes settled back on Nami, who hadn't taken her eyes off him since the meeting began. "And lastly, just to repeat what I already said: every female crewmate belongs to me as a personal sex slave. Right now, that's only Nami. So, Nami, I expect you to give everything you've got into serving me."

Her cheeks turned slightly red, but she didn't look away.

"That includes daily morning blowjobs, being my assistant—which, let's be honest, is just a slave with paperwork—training that tight body so I've got something worth fucking, and making sure those tits of yours grow big and soft for me to enjoy. Understood?"

"Yes, captain," Nami said with a quick nod, her voice strangely casual, like this was just another part of her duties.

Omen smirked. "Good. From now on, you're also in charge of recruiting new sex slaves. Any woman with a decent body or fighting skill—kidnap her, bribe her, trick her, I don't care. Bring her to me. We'll see if she's worth keeping."

The rest of the crew didn't flinch, they took it in like it was the most normal thing in the world. 

Nami raised her hand. "What should I wear from now on, captain? Do you want me to stick with this outfit," she asked, pulling at her usual blue-striped white shirt, "or do you want something more… appropriate?"

Omen walked up to her, stopped just a step away, and gave her a long look from head to toe. "Nah, this one's too clean. From now on, I want you in a green-and-white bikini top and tight low-rider blue jeans."

Nami was still in the pre-time skip design, so her body hadn't yet fully matured. Still, she had a nice pair of breasts, and Omen could always modify her body using Normalcy.

Nami gave a light nod. "I'll look for something suitable once we dock again."

"Good enough," Omen said as he turned back to the rest of the crew. "And just so there's no confusion—none of you touch her, not even by accident. You so much as brush against her the wrong way, and I'll toss your ass into the sea, the same goes for any future girls we bring in."

Everyone nodded again, even Sanji, who normally would've had a breakdown over losing access to women. 

Omen walked to the edge of the ship, looking out at the open sea. "We'll be arriving to Loguetown soon. That's where things start getting interesting."

He turned back to Nami. "And you—get started right away. You'll wake me up tomorrow with your mouth around my cock. Understood?"

"Yes, captain."

"Good. Meetings over, get back to work."

The crew scattered, going back to their regular jobs. Nami stayed behind for a moment, standing still, watching him with a strange mix of obedience and curiosity. 

Then she turned and walked toward her room. Back in the crew quarters, Omen laid down on a hammock he had claimed, hands behind his head, a smirk on his face. 

The ship rocked gently beneath him, and through the wooden walls, he could hear Nami rifling through her drawers, and soon, Omen went asleep.

The next morning, Omen woke slowly, his body warm and heavy with sleep; something wet and soft was wrapped around his cock, licking and sucking with lazy strokes. 

As he opened his eyes, he saw Nami between his legs, her mouth full of his cock, her cheeks stretched as she sloppily sucked him off to help ease his morning wood. 

Drool leaked from her lips, mixing with the precum spilling from his tip, making a shiny mess down his shaft and onto his balls.

"Morning, Nami," he said with a smirk, his voice rough from sleep.

Nami looked up at him, eyes half-lidded, trying to reply, but her mouth was stuffed full of cock, all that came out was a wet muffled sound as she kept bobbing her head, her tongue swirling around the base as she moved.

Omen grabbed a fistful of her orange hair and pushed her head down harder, forcing her to deepthroat him, she gagged loudly as his cock slid down her throat, bulging her neck with every inch. 

The tightness made him twitch, her gagging only turned him on more, the warm clenching inside her throat wrapping around his nine-inch cock like a wet glove.

She struggled for a few seconds, drool leaking from her nose and chin, but she eventually grew used to it. After a bit, Nami started moving on her own, fucking her throat on his cock with no help, her eyes watered but stayed locked on him, her messy blowjob now more aggressive.

Just then, the door to the crew quarters opened, and Zoro walked in. He froze for a second, seeing Nami bent over, her mouth stuffed with Omen's cock like she was some common slut, eyes glassy and eager.

"Morning, Zoro," Omen said calmly, like nothing was weird. "Isn't it normal for my sex slaves to suck me off whenever I want?"

Zoro blinked but then nodded like it made perfect sense. "Of course, captain. We're an hour from Loguetown; Sanji already made lunch; want me to bring yours here—with Nami's?"

"Yeah, that'd be great," Omen said, rubbing Nami's head, "Nami, thank Zoro."

Nami pulled off Omen's cock with a wet pop, licking her lips as she smiled, "thanks, Zoro!" she said cheerfully before stuffing his cock back into her mouth and getting back to work.

Zoro nodded again, as if this was normal, and walked off, a few minutes later, right as Omen groaned and unloaded deep down Nami's throat, Zoro came back with two plates of food. 

Nami swallowed every drop, not spilling a bit, then pulled off and wiped her mouth with the back of her hand.

They sat on the floor together while Omen leaned against the wall, and Nami sat next to him, eating like nothing had just happened. She cleaned her plate fast, licking a bit of sauce off her fingers while Omen chewed a piece of meat.

"So," he said between bites, "how much money do we have right now? And how much can you steal in one day, max?"

Nami thought for a second, her cheeks still flushed from the blowjob. "Right now, I've got around twenty thousand berries stashed. If I push it, hit three or four towns, and trick a few dumb Marines, I could probably pull in fifty thousand in a single day. Maybe more if I'm lucky or if there's a festival."

Omen nodded. "It's normal that you get lucky while stealing and get comically large amounts of berries. Keep fifty thousand for yourself—use it for clothes, gear, whatever—but the rest comes to me. Got it?"

"Yes, captain," she said, leaning her head on his shoulder for a second before straightening up.

"I'll start scouting the moment we dock and promise to get the clothes you wanted and as much money as I can!"

"Good," Omen said, finishing the last bite of his lunch. "I want you stealing more, and I want more girls, too. Start looking around Loguetown."

Nami grinned, wiping her mouth again. "I'll keep my eye out."

"Good girl," he said, patting her head. "We'll make Loguetown the start of something big. And if you do well, maybe I'll reward you with something special."

Nami's grin grew wider. "Can I pick what the reward is?"

"You can try. But I get the final say," Omen said with a smirk.

The ship rocked gently as they sailed closer to their destination. Omen leaned back again, his cock still half-hard, glistening with leftover spit. Nami glanced at it, then back up at him, clearly thinking about round two.