Demon Lord Rimuru Unifies the Grand Line, Starting at Laugh Tale

Disaster-class Demon Lord, strongest slime on the planet: Rimuru arrives in the world of One Piece! At first, he only wanted to be an ordinary pirate. But he landed on the legendary Final Island, Laugh Tale, said to grant the title of Pirate King to anyone who sets foot there. The little ship he casually smashed through was the legendary World-Destroying Ancient Weapon, Uranus. On the very first day he arrived in the world of One Piece, the world rewrote its rules overnight, changing the Three Ancient Weapons from Uranus, Poseidon, and Pluton to: Pluton, Poseidon, and... the Demon Lord. He became the world's new "king," a living legend. Click into the story and you'll find: The pirate emperors' undercover antics in the Rocks Pirates √ Akainu calling Whitebeard "Dad" √ The Whitebeard Pirates raising their sons √ Hilarious everyday life with the Roger Pirates √ The legendary life of a Marine hero suspected of being a spy √ The Donquixote Family going straight √ ASL's happy childhood √ Ace's freewheeling voyage √ Content warnings: 1. [No CP in the main story ending], but there will be lots and lots of unrequited crushes. 2. [One-on-one pairing in the extras], no secondary pairings, no betting on ships. 3. The male lead is at the top in strength, intelligence, and looks. Lots of one-sided crushes + a male lead who's truly oblivious = [someone's going to get hooked and left hanging]. 4. The male lead is a long-lived species, and the timeline spans a very long period. 5. Most of the romance plotlines in this story were inspired by poetry. If I have time, I'll put together a list of the poetry collections I referenced. [Next up: "The Red-Haired Four Emperors' Crew's Morale Booster." Please add it to your collection.] One-line summary: Red-Haired Pirates: We fight while you cheer us on. Does that make sense? Ace: ...Just tell me, did we win or not? Theme: Happy Ending