One possible plotline could be that fem Naruto has to learn to control the Kyuubi's power in a different way than in the original series. Since she's female, her approach might be more empathetic, and the story could focus on how she forms a deeper connection with the Kyuubi because of this.
Maybe the plot could involve the Kyuubi having a different view of fem Naruto compared to male Naruto. It could lead to some interesting interactions where the Kyuubi is more protective or has a different type of relationship with her. For example, they might communicate in a more emotional way, and this could drive the story as they face various challenges in the Naruto world together.
One possible plotline could be the two characters starting as enemies or at least with a lot of misunderstandings. As the story progresses, they gradually come to understand and trust each other, and a romantic relationship begins to form.
There could be a plotline where the fem Kyuubi gets into trouble in the village because she's not fully understood as a pet. Naruto then has to defend her and prove that she's not a threat. Also, a plot where they discover a new power together that helps them in a big battle against a new enemy.
One possible plotline could be that the female Kyuubi uses her power and influence to guide Naruto in a different way than in the original story. Naruto, being submissive, follows her advice which leads to new adventures and challenges. For example, she might direct him to explore a different aspect of his ninja training.
Perhaps the story could revolve around the Fem Kyuubi teaching Naruto more about his Kitsune heritage. This could include special jutsu or abilities that only those with Kitsune blood can learn. The plot might also involve Naruto having to protect the Fem Kyuubi from other ninja who fear her power and want to seal her away again.
Well, it could start with the fem Kyuubi being in love with Naruto. Since she has negative feelings towards Kushina, she could begin by influencing Naruto's view of his mother. For example, she might show Naruto 'alternate' versions of Kushina's past actions that are not entirely true. As the story progresses, the fem Kyuubi could try to isolate Naruto from anything related to Kushina, like the Uzumaki clan heritage that Kushina represents. And perhaps, in the end, she realizes the error of her ways when Naruto discovers the truth about his mother. However, this is just one possible set of plotlines in such a complex and potentially controversial fanfiction concept.
One possible plotline could be about Naruto and the fem kyuubi fox form teaming up to fight a powerful new enemy. Maybe an ancient evil has been awakened and they have to combine their powers to defeat it. Another could be a story of the fem kyuubi fox form teaching Naruto more about his own chakra nature and how it relates to her power.
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.
It could also be for revenge. Naruto might have unknowingly done something that offended fem Kyuubi in the context of this fanfiction. For example, he could have disrupted her plans or made an enemy of someone she cared about. So, trapping him in a henge is her way of getting back at him.
One common plotline could be the conflict that arises between fem Kyuubi's possessiveness and Naruto's own desires for freedom and friendship. Naruto might want to explore and interact with others, but the fem Kyuubi tries to hold him back.
Another motive might be jealousy. Suppose Naruto has something that the fem Kyuubi desires, like the love and respect of the people in the village. In that case, she could torture him out of envy, trying to make him lose those things that she covets so much.