One possible plot could be Naruto gradually realizing his feelings for Fem Kyuubi as they go through various adventures together. Maybe they start off as friends but as they face more and more challenges, like fighting powerful enemies, their bond deepens into love.
A really interesting plot could be that Fem Kyuubi's power is somehow connected to her relationship with Naruto. As they fall in love, her power either grows or changes in a way that affects the entire ninja village. And Naruto has to deal with the consequences of this new - found power dynamic while also nurturing their relationship.
In some fanfictions, a possible plot is that Fem Naruto uses her femininity to her advantage when dealing with the Kyuubi. She could charm or trick the Kyuubi in some way that Naruto in the original couldn't. Like, she might offer the Kyuubi something it really wants in exchange for its power, but in a more cunning way.
A great plot could be that Fem Naruto wearing the Kyuubi attracts the attention of other villages. They see her as a potential threat or an opportunity. This could lead to diplomatic tensions. Meanwhile, within her own village, she has to deal with the elders who are worried about her newfound power and how it might disrupt the balance. But Fem Naruto, with the Kyuubi's power, is determined to prove that she can use it for the greater good. She might start training with new mentors who understand the Kyuubi better, and through her training, she unlocks even more hidden abilities.
One interesting plot could be Naruto forming a unique bond with Fem Amaterasu and Fem Kyuubi. For example, Fem Amaterasu might use her powers to help Naruto in battles in a different way than in the original story. Maybe she can create special fire-based defenses or attacks that complement Naruto's skills. And Fem Kyuubi could have a more nurturing side, guiding Naruto not just with power but also with wisdom. They could all team up to face a new and powerful enemy that neither Naruto alone nor his usual allies could handle easily.
A plot could be that Fem Naruto and Fem Kyuubi have to go on a journey to find a special artifact. Along the way, they face various enemies and obstacles. They rely on each other's skills, with Naruto using her ninja techniques and Kyuubi her powerful chakra. This journey could also be a self - discovery for both of them, learning more about their true selves and their place in the world.
Perhaps a plot where the female Kyuubi characters all have different powers and abilities, and Naruto has to figure out how to work with each of them. This could lead to some really cool fight scenes where Naruto and the female Kyuubi use their combined powers to defeat a common enemy. It also shows how they complement each other in the harem setting.
A possible plot is that the Fem Nibi and Fem Kyuubi are reincarnated in human forms and they meet Naruto by chance. They initially don't remember their past as tailed beasts but feel a strange connection to Naruto. As they start to regain their memories, they discover that they have a shared destiny with Naruto to save the ninja world from a dark prophecy. Along the way, they have to overcome their own differences and learn to work together, all while Naruto is trying to figure out his feelings for these two unique characters.
One interesting plot could be the female Kyuubi helping Naruto master new jutsu in a very unique way. Since she has a deep connection with Naruto, she might be able to access his chakra in a different manner and guide him to unlock hidden powers.
A possible storyline is that Fem Naruto discovers a hidden ability of the Kyuubi that is related to femininity. Since she is female, she is able to unlock this power that was previously unknown. This new power helps her in battles and also changes the way the village views her and the Kyuubi. It could also lead to a story where other female characters in the village are inspired by her and the Kyuubi's relationship and start to train to become stronger in their own ways.
Well, a great plot point could be the way the fem Kyuubi tries to understand human emotions better because of her love for Naruto. Maybe she starts to learn about things like friendship and sacrifice, which are values important to Naruto. Also, there could be a plot point where Naruto has to make a choice between his loyalty to the village and his relationship with the fem Kyuubi, creating a real moral dilemma.
One interesting plot could be Naruto using his unique bond with Kyuubi to help it regain its lost memories. Naruto might explore the Kyuubi's past and discover things that even the Kyuubi itself had forgotten. This could lead to new powers or a deeper understanding between them.