Perhaps the plot could involve other characters' reactions. His friends like Sakura and Sasuke might be very surprised and have mixed feelings. Sakura could be worried about Naruto's safety or think it's a strange idea. Sasuke might be more indifferent but still keep an eye on the situation. And the village elders might oppose the marriage due to the nature of Kyuubi, seeing it as a threat to the village's stability.
One possible plot development could be that Naruto is initially shocked by Fem Kyuubi's proposal. He might be hesitant because he has his own goals and relationships in the village. However, as the story progresses, he could start to see the good in her and consider the idea. Maybe she shows him a side of her that is kind and caring, different from the fearsome Kyuubi he knew before.
Another development could be that Fem Kyuubi tries to prove herself worthy of Naruto. She could start to help the village secretly, like protecting it from other threats. This would gradually change the villagers' perception of her. Naruto, seeing her efforts, would be more inclined to accept her proposal. And they could go through various adventures together that strengthen their bond.
The plot might center around the fem Kyuubi's desire to own Naruto due to some sort of pre - determined fate. She might have a vision or a prophecy that Naruto is essential to her future. So she attempts to control his actions and decisions, which Naruto initially resists. This creates a dynamic tension between them as they navigate through different challenges in the Naruto universe.
One possible plot could be that Sasuke realizes his deep connection with Fem Naruto over time. Maybe they go on various missions together and he starts to see her in a new light. As they face challenges side by side, his feelings grow into love and he decides he wants to marry her. He then has to overcome the initial shock of the village and their friends, as it's an unexpected pairing.
One possible plot development could be that Kushina's spirit somehow manages to break through the boundaries between the afterlife and the living world. She then tries to communicate with Naruto, perhaps through dreams at first. This could lead to Naruto starting to search for a way to bring her back permanently, involving him in some sort of ancient and dangerous ritual that he discovers in some long - forgotten scroll.
One idea could be that the fem Kyuubi starts to show her affection in small ways. For example, she might protect Naruto more fiercely during battles. She could also start leaving little signs of her presence around him, like a soft growl when danger is near that only he can hear. This would build an interesting dynamic as Naruto tries to figure out what these new behaviors mean.
Another way could be through communication. In some private moments, she might open up to Naruto about how she feels. She could say things like 'You are important to me, and I want you by my side always' in a soft and sincere tone.
In this fanfiction, Naruto could develop his skills in a new way. Since he is dealing with a banished Fem Kyuubi, he may have to learn different ways to communicate and work with her. This could lead to him becoming more adaptable. The Fem Kyuubi might develop from a vengeful being into one who is more forgiving. She realizes that not all humans are bad through Naruto's kindness, and this changes her view of the world and herself.
Another interesting one could be 'Fem Kyuubi's Desire for Naruto' on Archive of Our Own. In this fanfic, the fem Kyuubi is portrayed with a lot of depth. It shows her inner thoughts and feelings towards Naruto as she tries to navigate the world around her while being attached to Naruto in a very special way. It's a really engaging read if you like this concept.
One possible plot development could be that Harry tries to find a way to escape the marriage. She might use her magical skills and the help of her friends to break free from Voldemort's control. Another could be that she pretends to go along with the marriage while secretly planning to undermine Voldemort from within.
A possible plot is that Fem Kyuubi is jealous of Naruto's relationship with the Hokage. The Hokage might see Naruto as a symbol of hope and invest a lot of time and resources in his training. Kyuubi, feeling neglected in comparison, could start spreading rumors in the village about Naruto having some dark secrets related to her power. This would lead to a situation where Naruto has to prove his innocence and also deal with the villagers' changing attitudes towards him.
Another plot development could be the impact on the other characters in the Naruto universe. The presence of a fem Kyuubi might change how characters like Sasuke view Naruto. They could be more intrigued or even more hostile depending on how they perceive the new relationship between Naruto and the fem Kyuubi. Also, the village elders might react differently, perhaps with more fear or more acceptance, which would then influence the overall political and social situation in the village.