One possible plot could be that during a journey on the Grand Line, Nami and Luffy find themselves in a strange and beautiful island. There, they start to discover new feelings for each other. Nami might be initially hesitant due to her past experiences and her focus on the treasure, but Luffy's pure heart and his unwavering belief in their friendship gradually make her open up. And they could go through various adventures on the island together, strengthening their bond in a more romantic way.
One interesting theme could be the exploration of loyalty in a different context. In the original story, Luffy and Nami have a strong bond of loyalty as crewmates. But in a fanfic, this loyalty could transform into a more romantic and exclusive loyalty towards each other. Another theme might be the discovery of self - through their relationship. Nami could learn to trust more deeply, and Luffy could become more aware of his own emotions.
One common theme is protection. Luffy is always ready to protect Nami and in a family - fanfic context, this extends to protecting their 'family' within the crew. Another theme is growth. As they form a family - like bond, they both grow as individuals. Nami becomes more confident in her decisions and Luffy learns more about the importance of relationships other than just being comrades.
I'm not sure if there is a specific 'naruto x nami lemon fanfic' available. Fanfics can be quite diverse and are often created by fans independently. You can try searching on popular fanfic websites like Archive of Our Own or FanFiction.net, but keep in mind that the 'lemon' genre often implies adult or sexual content which may not be allowed on all platforms.
I'm not really aware of which 'luffy and nami lemon fanfics' are particularly popular. Fanfic popularity can be quite subjective and spread across different fanfic platforms. You might need to search on popular One Piece fanfic websites and check the reviews or ratings to find out.
In a Luffy x Nami Lemon New World fanfiction, there could be a situation where Nami is kidnapped by a group who wants to use her knowledge of the New World and the lemons (maybe there are special lemons with unique properties there). Luffy, being the fearless captain, sets out on a solo mission to rescue her. Along the way, he meets some old friends and new allies. When he finally reaches Nami, they both realize their feelings for each other have grown even stronger during this ordeal.
One popular 'luffy x nami family fanfic' might be 'The Straw Hat Family Ties'. It shows how Luffy and Nami's relationship evolves into a family - like bond within the Straw Hat crew. They support each other like family members would, with Luffy's unwavering leadership and Nami's intelligence in handling the crew's finances and navigation.
A 'naruto x nami lemon fanfic' would likely be about a romantic and sexual relationship between Naruto from Naruto and Nami from One Piece. But this is just speculation as such a fanfic would be inappropriate and not in line with the original themes of the two shows.
In One Piece, the relationship between Luffy and Nami is complex. There are many instances where they show great care for each other. For example, Nami is often worried about Luffy when he gets into dangerous battles. Luffy, on the other hand, will do anything to protect Nami. While it may not be an out - and - out love story like in a traditional romance, there is definitely a strong and unique relationship that has elements of love in the form of deep friendship and loyalty.