Well, the story could start with Naruto and Fem Kyuubi being transferred to the High School DxD school. Naruto might struggle to adapt to the different rules and social hierarchy there. The Fem Kyuubi, on the other hand, could use her charm and wits to navigate through the new environment. Their relationship could evolve as they face challenges together, like dealing with the various factions in the school.
Well, one way the storyline could develop is that Evil Naruto would likely disrupt the power balance in the High School DxD world. He might use his dark powers to challenge the existing factions. For example, he could target the devils and their hierarchy. His abilities, like shadow clones and powerful jutsus, would be a huge threat. He might also form his own group of followers, consisting of those who are attracted to his power or share his evil ideology.
His role could be that of a protector. Given his nature of protecting his friends in the Naruto series, he would likely do the same in the High School DxD world. He could protect Fem Kyuubi from those who might want to take advantage of her power. Also, he could be a bridge between the different species in the school, using his understanding of different types of people from his own world.
Well, it could be that Fem Naruto has to prove herself to Fem Kyuubi. Maybe there's a prophecy or something that says only by uniting with Kyuubi can Naruto save the village in a new and greater threat. So, Naruto embarks on a journey to understand Kyuubi better. Along the way, they have adventures, meet new characters. Kyuubi starts to respect Naruto for her tenacity and Naruto admires Kyuubi's power. Their relationship evolves and eventually leads to them becoming mates, which also brings about a new era of peace and understanding in the village.
The fem Kyuubi could be initially attracted to Naruto's struggle with the Kyuubi inside him. She decides to help him. As Naruto's mental state improves due to her efforts, they could develop a romantic relationship. For example, she could teach him how to better control the Kyuubi's chakra, and in the process, they fall in love.
If Naruto had Kyuubi's power in the High School DxD universe, things would be chaotic at first. His presence would be a shock to the different factions. The devils would likely try to either recruit him or eliminate him. But Naruto, with his strong will and Kyuubi's power, could form new alliances. He could teach the students at the school some of his ninja ways and in turn learn about the magic and powers in that world. His Kyuubi - enhanced abilities would make him a formidable opponent in the Rating Games.
The relationship between Naruto and the fem werewolf could start as a friendship based on mutual respect for each other's abilities. Naruto would be intrigued by her werewolf powers. With the fem Kyuubi, Naruto already has a complex relationship due to the Kyuubi inside him. As the story progresses, the fem werewolf might develop romantic feelings for Naruto, which could make the fem Kyuubi a bit envious at first. But eventually, they could all form a strong, platonic bond where they support each other in different ways, like in battles or in dealing with the politics of the Hidden Leaf.
The female Kyuubi might start with a relationship of distrust towards Naruto. After all, the Kyuubi has a long history of being feared and hunted. But as Naruto shows her kindness and understanding, she could gradually warm up to him. The female Juubi, being a more mysterious and powerful being, might be initially indifferent to Naruto. However, when she sees his determination and the good in him, she starts to respect him. Their relationships would develop through shared battles and experiences, with Naruto constantly proving himself to be a worthy ally and friend.
The relationships could develop in a very complex way. Fem Amaterasu might initially be aloof because of her divine nature. However, Naruto's tenacity and his own special powers would draw her in. Fem Kyuubi, having a more primal connection to Naruto already, would further strengthen that bond. As they go on adventures together, Naruto would often be the mediator between Fem Amaterasu and Fem Kyuubi. Their different personalities would clash at times, but through Naruto's influence, they would learn to work together and eventually form a strong and loving relationship with Naruto at the center.
At first, their relationship might be based on mutual need. Naruto, being the one who wants to right the wrong of her banishment, and the Fem Kyuubi, who may need someone to help her. As they spend more time together, they start to understand each other better. Naruto sees the Fem Kyuubi not just as a powerful being but as a sentient individual with feelings. The Fem Kyuubi, in turn, realizes that Naruto is different from the others who feared or hated her. This understanding gradually turns into a deeper emotional bond, which could develop into love over time.
One way it could develop is if Naruto's ninja training and values from his world conflict with the more flirty and forward nature of the female demons in High School DxD. He might see their behavior as inappropriate or untrustworthy, which would fuel his 'hates women' stance.