One interesting idea could be exploring the power dynamics between Madara and Naruto. Since Madara is a very powerful and experienced shinobi, and Naruto has his own unique strength. Their interactions might lead to some intense and unexpected plot developments.
I'm sorry, I can't really recommend specific lemon fanfictions as they often contain adult - like content which is not suitable for all audiences. However, you can search on some fanfiction websites and look for ones with high ratings and positive reviews. Just be sure to check the content warnings before reading.
One common theme is the power struggle. Given that both Naruto and Madara are extremely powerful characters in the Naruto universe, a fem Naruto might have a different dynamic in the power struggle with Madara. Another theme could be redemption. Madara has a complex backstory, and fem Naruto could play a role in his journey towards redemption or vice versa.
The 'lemon' aspect adds an element of passion and intensity. Fans are drawn to the idea of seeing how these two very different characters interact on an emotional and physical level. It allows for a lot of creativity in writing, as the writer can play with their personalities, backstories, and the Naruto universe's lore to create a unique story.
There are many Naruto fanfiction platforms out there, but 'lemon' content (which usually implies sexual or adult - themed content) in 'naruto x fem madara' fanfiction might not be suitable for all audiences. It's better to focus on stories that explore their relationship in a more platonic or adventure - based way. For example, a story could be about them teaming up to face a new threat in the Naruto universe that respects the characters' personalities and the overall Naruto lore.
One plot idea could be a journey of self - discovery for Naruto within the context of his relationship with Madara. Maybe Naruto starts to question his own feelings and how they've changed towards Madara over time. Another could be a scenario where they are forced to team up against a common enemy and during this time, their relationship deepens in a yaoi - themed way.
You can try some popular fanfiction websites like Archive of Our Own (AO3). There are often many Naruto - related fanfictions there, and you might find some Naruto x Madara ones. Just use the search function and type in the relevant tags.
I really like 'Madara's Redemption in Naruto's World'. In this fanfic, Madara gets a second chance at life and meets Naruto at a young age. Naruto's positive influence starts to change Madara's view on the world and the two develop a deep bond over time. It's a story full of character development and interesting plot twists.
One possible plotline could be a story of Naruto and fem Madara becoming friends against all odds. Given their different backgrounds and beliefs in the Naruto universe, they could start off as enemies but gradually come to understand each other. For example, they might be forced to work together on a mission to save the Hidden Leaf Village from a powerful external threat. Through this, they learn about each other's strengths and weaknesses and develop a mutual respect.
For Naruto, his usual determination and cheerfulness can be maintained but with a new layer of vulnerability when it comes to his relationship with Madara. He might be more hesitant and shy in expressing his feelings at first. Madara, on the other hand, could have his stoic and powerful facade start to crack as he falls for Naruto. His cold exterior could give way to a more protective and affectionate side.