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Sin of lust: Sign-In System in One Piece

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Synopsis
Born beneath a sky torn asunder by Conqueror's Haki and bathed in the sun's first light, Raijin D. Kairo entered the One Piece world as a literal newborn monster. Blessed—or cursed—with the legendary body of Yoriichi Tsugikuni and a Sign-In System at birth, he begins his life OP, cocky, and hilarious. With all three types of Haki awakened as his starter gift, he quickly stumbles upon a Mythical Zoan: Incubus Incubus no Mi at age 3, hidden within an ancient ruin buried deep in the wild jungles of his birth island. Raised by a fearsome ex-Warlord father and a former Kuja elite mother, Kairo isn’t your typical protagonist. He’s bold, pervy, divine in battle, and has a heart big enough to shake kingdoms. His journey will rewrite destinies—including Boa Hancock’s, whom he’ll save before slavery ever touches her skin. But lust, legacy, and laughter follow him wherever he goes. Because this world isn't ready for a sun-born demon with a grin.
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Chapter 1 - Chapter 2: Incubus Awakens - Ripples in the World

The ancient ruin had long stood in silence, untouched by the passage of time, hidden by nature's embrace. But the moment Adam bit into the Incubus Incubus no Mi, that silence shattered.

A pulse reverberated across the sea.

It wasn't just the island that felt it.

### **Elsewhere, Far Across the Grand Line…**

#### **Mariejois — The Holy Land**

The sky above the Celestial Dragon chambers darkened momentarily. An old Den Den Mushi on a dusty shelf clicked awake, eyes wide with panic as a transmission blared through—an ancient frequency, one not heard in centuries.

"...It stirs... The seal is broken..."

One of the Five Elders froze mid-conversation.

"No... it can't be. That fruit was lost to the void—"

Another turned toward the swirling window of perception, eyes reflecting a distant crimson light.

"The Succubus Fruit was just the cover name. The Incubus Fruit... was the core. Someone found it."

"...Someone *worthy*..."

They did not finish their tea that evening.

#### **Impel Down — Level 6**

Deep beneath the sea, in the lowest pit of human suffering, a chained beast opened its eyes for the first time in decades.

"He's come," the monster muttered, more shadow than man. "The true Incubus rises again."

The guards above screamed seconds later. The beast laughed.

**Amazon Lily**

Elder Nyon, seated before the ancient Kuja tapestries, felt a tremor in her bones.

"The charm returns to the world… and it's not in the hands of a woman."

Boa Hancock, young and prideful, raised an eyebrow.

"What does it mean, Granny?"

"It means," she said slowly, eyes narrowing, "the world just got a lot more dangerous... and *tempting*."

#### **An Abandoned Library in Ohara's Ruins**

A young rogue archaeologist brushing through the ashes of the past froze as a nearby relic glowed faintly for the first time.

"Desire... awakens," she whispered.

#### **Back on the Island**

Adam stumbled out of the ruin, breath heaving, eyes wide.

The fruit had changed him.

It wasn't just his body—though his muscles felt charged with unnatural vitality. His eyes shimmered faintly crimson. His heartbeat echoed like a drum of lust, power, and presence. Birds landed near him and cooed. A fox nuzzled against his leg without fear.

Everything *wanted* to be near him.

He didn't know it yet, but his presence alone would start to change those around him. Strengthen them. Confuse them. Entice them. And it would only grow.

He looked up.

The clouds were spiraling, the winds picking up. A subtle shimmer moved through the atmosphere like heat off desert stone.

The world knew.

The world felt him.

And somewhere in the deep, deep sea...

A Laugh echoed.

Not a man's.

Not a god's.

Something in between.

And it whispered...

"Welcome back, little Incubus. Let the game begin."

---

[End of Chapter 2]

Chapter 3 Preview:

Adam wakes to the first aftereffects of the fruit. His mother notices a change in her son. Karlos begins Adam's physical training, unaware of what stirs deep within the boy's soul... and the first outsider steps foot on their hidden island.