They could start with a big hug. Then Shanks might tease Luffy about his still - crazy appetite. Luffy, in turn, could show off his new crew members to Shanks.
A powerful new pirate group could be the main antagonist. They might be after the same treasure or territory as Luffy and Shanks. They could have some unique and dangerous abilities, like the ability to control sea monsters. Their leader could be a former crewmate of a well - known and feared pirate, who has his own vendetta against both Luffy and Shanks for some past reasons.
One possible plot could be that Luffy, while on a new adventure in a mysterious island, accidentally discovers a hidden treasure map that leads to a place Shanks has been looking for. Luffy decides to find Shanks and share the map. When they meet, they team up to face the various pirates and obstacles in their way to reach the treasure. Along the way, Shanks teaches Luffy some new combat skills and they strengthen their bond as friends and pirates.
In this fanfiction, perhaps Luffy has become much stronger. He might show Shanks his new skills and powers. They could also talk about their adventures since they last met, like Luffy sharing his experiences on different islands.
In fanfiction, when Shanks meets Luffy's crew, it could be a very emotional reunion. Shanks might be impressed by how much Luffy and his crew have grown. He could see the strong bonds within the crew and be proud of Luffy for leading them so well.
In the fanfiction, Luffy might show Shanks how much he has grown. He could display his new Haki abilities and his stronger crew. Shanks would be proud of Luffy's progress.
Their relationship could start with Uta being initially distrustful of Luffy. After all, Luffy is a pirate and Uta has her own ideas about pirates. But as she sees Luffy's pure heart and his determination to protect his friends and pursue his dreams, she starts to warm up to him. They might then become friends who share their different stories and experiences.
They could have heart - to - heart conversations. For example, Shanks could share his past adventures and the lessons he learned from them with Luffy. This would help Luffy gain more wisdom and also deepen their connection.
A different fanfiction could be set in a post - war scenario. Luffy has achieved his goal of making the world a freer place, and Uta, with her music, is now using her influence to bring joy and peace to the people. They team up to hold a grand concert on an island that was once ravaged by war, and their combined efforts help the island to revive and thrive.