A prevalent theme is the exploration of their relationship in different scenarios. For example, in some fanfictions, the kisses might happen during a time of celebration after a great victory. This shows their joy and how they share their emotions with each other. Also, themes of protection often come up. A kiss can be a way for one to comfort the other when they are in danger or feeling vulnerable.
Well, I've heard of a fanfiction where Ace and Luffy's relationship is explored in a very unique way. It's titled 'Love Beyond the Seas'. The kisses in this story are quite special as they are set against the backdrop of their adventures at sea. It shows how their relationship has grown over time and how these kisses are a natural progression of their deep - seated love for each other. However, different people may have different preferences when it comes to fanfictions, so it might be worth exploring a few to find the one that really suits you.
In Robin and Luffy time travel fanfiction, a frequently seen theme is the exploration of history. Since they are time traveling, they get to see the One Piece world's past up close, which includes things like the origin of devil fruits or the history of certain kingdoms. Another theme is the strengthening of their bond. Through facing different challenges in different time periods together, their friendship and trust in each other grow even deeper. And of course, the theme of destiny also often appears. They might question if their time travel was fated and what role they are supposed to play in the different timelines.
I recommend the novel One Piece Montage to you. The male protagonist transmigrated to the world of One Piece. In the process of becoming a Luffy crew member, he met Robin and gradually fell in love with her. There were two mysterious powers in his body. One was the energy source in his body, and the other was a treasure from time and space. By searching for treasures and activating energy sources, the male protagonist moved towards his goal of saving the world and being with Robin. I hope you like this fairy's recommendation. Muah ~😗
The appeal lies in the unique combination of their characters. Luffy is all about freedom and adventure, while Robin is the intelligent and mysterious one. When Luffy is godlike, it adds a new dimension to their relationship. Fans love to see how Robin would react to an even more powerful Luffy and how they would interact in different situations.
One interesting plotline could be Luffy achieving a new level of power, like a godlike state, and Robin being the first to truly understand the implications of it. This could lead to them going on a journey to uncover secrets about the world that only Luffy's new power can access.
Another idea is that they are separated from the rest of the Straw Hat crew. In this situation, Luffy and Robin rely on each other more than ever. They travel through a dangerous area filled with strange creatures. Luffy protects Robin from the physical threats, and Robin uses her skills to find food and shelter. Along the way, they have deep conversations that strengthen their bond as nakama.
Their relationship could develop in a more academic way. Since Robin loves knowledge, she might start teaching Luffy about the history of the world. Luffy, being curious, would listen intently and ask simple but profound questions. This would make Robin see Luffy in a new light, not just as a captain but as someone with a thirst for knowledge as well.
Perhaps the baby could have a special role in the future of the Straw Hat Pirates. It could be seen as a symbol of hope and new beginnings for the crew. The baby might grow up to be a great navigator or fighter, adding to the strength of the crew. And the relationship between Luffy and Robin would evolve as they become parents, sharing more tender and responsible moments.
One great Robin and Luffy time travel fanfiction is 'Time - Twisted Adventures'. It has an interesting plot where Luffy and Robin get sent back in time and have to figure out how to get back to their own era while also changing some key events in the past. Another is 'Time Travelers of the Straw Hats' which focuses on how their time travel affects the relationships within the crew in unexpected ways.