Another plot could be that the Kyuubi is initially confused by Fem Naruto. Since she is different from the Naruto it's used to. This confusion could lead to some really interesting interactions. The Kyuubi might be more hesitant to trust her at first, but as time goes on, they develop a strong bond that is different from the one in the original series.
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.
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 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.
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.
In many fanfictions, Fem Naruto might show kindness towards the Kyuubi. This kindness could be something the Kyuubi has never experienced before. For example, instead of just seeing it as a source of power, Fem Naruto might try to understand the Kyuubi's past and pain. This could lead to the Kyuubi gradually opening up to her and them developing a deeper bond.
In this fanfiction, perhaps Naruto meets the fem Kyuubi in a different dimension. The fem Kyuubi might be a more gentle and intelligent version compared to the traditional Kyuubi. She could teach Naruto some ancient ninja techniques that were lost long ago. They might also form an alliance to fight against a new common enemy that is threatening the Hidden Leaf Village.
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.
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.
In some fanfictions, the Kyuubi's protection might lead to Naruto having a special bond with nature. Since the Kyuubi is a powerful force, it could influence Naruto's chakra in a way that makes him more attuned to the natural elements around him. This could give him an edge in battles, like being able to manipulate the environment in ways others can't.
One interesting plot could be the Kyuubi's influence on Naruto's relationships in the harem. For example, the Kyuubi's power might attract some characters who are interested in that power, leading to unique interactions. Another plot could be Naruto having to balance his newfound harem with his ninja duties, and the Kyuubi sometimes interfering or helping in these situations.