One piece: "The Monstrous Crewmate"

The Lady Pirate and Pirate hunter

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4 Years Later...
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" Well they're finally setting out, eh, Mayor? I'll miss those rascals " Makino said

" But if they do become a pirate, they'll bring shame to the village. " Woop slap said with crossed arms

" I never thought they'd actually do it! " One of the residents laughed

" And Y/N managed to come back and keep his promise too! " Another one laughed

' But it's a bit concerning that Y/N still hasn't explained how he got that scar of his... ' Makino thought concerned

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" Wow! It's a good day to set out to sea! Isn't that right, Y/N?" Luffy happily said

" Yep. It's a beautiful day today, the sun is shining, the waves are crashing, and-"

He was cut off by the same sea beast that ate his arm from 10 years ago reappear infront of their small boat

" -Our local sea monster has arrived! " Y/N grinned

" Hey, Y/N! Can I take care of this? " He nods

"Alright! I'm sorry I have to do this... But here's an attack I've been perfecting since the last time we met!! " Luffy excitedly said

" Gomu-Gomu no... " He reels back his arm. The sea beast was only a few feet away from eating them

"...PISTOL!!! " Luffy proceeds to carve in the sea beast's face with his elastic rubber arm

" That's what you get, you darn fish! " The sea beast swims away

" Bravo, Luffy! Bravo! " Y/N applauded

" Thanks! " Luffy smiled

" Hmmm... First things first. I've got to get a crew! I think about 10 men should do. And I'll need a pirate flag! " Luffy said. He turns to Y/N with a smile

" Heh. You're the captain here, Luff. " Y/N chuckled

" LOOK OUT WORLD, HERE I COME! I'M GOING TO BECOME... THE KING OF THE PIRATES!!!! "

And so. Luffy and Y/N's adventure now begins in their small little boat

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" Wow! What a great day! The weather's so nice! Who'd have thought this voyage would end in disaster so soon? " Luffy said, leaning on Y/N

" Yep... It's kinda hard to believe that we're getting sucked into a giant whirlpool... Maybe we were a little careless... "

" We could use some help, but there's nobody around. " Luffy said as he gets up

" Hey, Y/N! You still haven't told me how you got that scar? " Luffy said. Y/N sweatdrops

" I don't think it's the right time to talk about that, Luffy... " Y/N deadpanned. They go deeper in the whirlpool

" Eh... I guess you're right -YIKES!! "

" LUFFY!! "

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Meanwhile, in a uncharted island...
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A feminine hand with jewelry swipes the top of their rail on their ship to see it was dusty

" Why is there dust on my bulwark? " A feminine voice said

The cleaner of the ship started to freak out and started apologizing like lunatic

" A THOUSAND PARDONS, LADY ALVIDA!
I-I THOUGHT I'D CLEANED EVERY INCH OF THIS SHIP...!! I'LL CLEAN EVERYTHING ALL OVER AGAIN! PLEASE--! "