I wrote One piece (Manga by Eiichiro Oda) fanfiction.
Here is the summary:
While charting a newly discovered archipelago, Trafalgar Law is determined to create the most accurate map the seas have ever seen. Every line must be perfect, every coordinate exact — until Monkey D. Luffy starts doodling sea monsters, hearts, and smiley faces all over his charts.
At first, it’s chaos. Then, impossibly, every doodle comes to life.
Sea creatures appear, islands shift, and the Polar Tang finds itself sailing through a world that shouldn’t exist.
For Law, it’s a scientific nightmare. For Luffy, it’s fun.
But somewhere between storms and starlight, precision gives way to wonder — and Law begins to see that maybe Luffy’s wild imagination is its own kind of map.
Because some hearts can’t be charted with instruments…
only drawn, messily and beautifully, across the sea.
You can read the story on fanfiction archive here:
https://archiveofourown.org/works/72851016