It could be a relationship of protection. Naruto might see it as his duty to protect the female Kyuubi beast from those who would use her for evil purposes. And the Kyuubi beast could see Naruto as a protector. They build a bond over this sense of protection, without it being romantic at all.
At first, the relationship might be based on mutual benefit. The fem Kyuubi might see Naruto's mercenary skills as useful for her own goals, and Naruto might see her power as an asset. As time goes on, they could develop a deeper emotional bond. They might start to understand each other's pasts and traumas, which would bring them closer together.
At first, their relationship might be one of mistrust. Naruto is wary of the Kyuubi as he's always been taught to fear it. But the female Kyuubi, being different in this fanfiction, tries to reach out to him. Slowly, they start to understand each other. Naruto sees that she's not like the stories he's heard.
The development of their relationship would be full of twists and turns. Naruto is a hero, and the fem Kyuubi is a powerful entity. In the female world, social dynamics might be different. Naruto could initially be confused by the fem Kyuubi's presence and her femininity. But as he gets to know her better, he'll realize that she's not so different from the Kyuubi he knew in some ways. They could start to trust each other gradually. For example, they might team up to face challenges in the female world together, which would strengthen their bond over time.
At first, Naruto might be a bit scared or hesitant. But as the female Kyuubi shows her care and concern for him, he would start to trust her. They would gradually develop a mother - son type of relationship. The female Kyuubi could be strict at times to make Naruto a better shinobi, but also very loving.
At first, their relationship might be one of wariness. Naruto, with the Juubi's power, is a force to be reckoned with, and the Female Kyuubi is a powerful entity on her own. But as they interact more, they could start to respect each other. For example, when they face a powerful enemy together, they see how each other fights and starts to appreciate their skills.
Their relationship could start off rocky. Naruto might be a bit intimidated by the Female Kyuubi at first, but as they spend more time together in high school, he would come to understand her better. They might start as just classmates who are forced to work together on a project, and gradually become friends. The Female Kyuubi, on the other hand, might start to see Naruto's good heart and his never - give - up attitude, and begin to warm up to him.
Their relationship could develop uniquely if Naruto, influenced by the Kyuubi's instincts, starts to protect Sakura in a more primal way. For instance, he might sense danger towards her before she does, and his reactions are more animalistic. This makes Sakura see a different side of Naruto, and she begins to understand the depth of the connection between him and the Kyuubi.
At first, their relationship might be full of tension. The cold Naruto is likely to be guarded, and the Fem Kyuubi may be wary of his intentions. But as time passes, they could start to understand each other's loneliness. Naruto's cold exterior might soften as he realizes the Fem Kyuubi also has feelings and desires.
Their relationship might start with Naruto being curious about the fem Kyuubi. He's used to the regular Kyuubi, but this new, female form is different. As he gets to know her, he discovers she has a softer side. And she, in turn, starts to see Naruto not as just a powerful being but as someone with a kind heart.
Their relationship could develop gradually. At first, Naruto might be a bit wary of the Kyuubi daughter because of her connection to the powerful Kyuubi. But as he sees her good intentions and her growing love for him, he starts to open up. They could start off as friends, sharing stories about their experiences with the Kyuubi's power. Then, over time, their friendship could turn into something more romantic as they face challenges together and rely on each other more.