The Fem Kyuubi might be in trouble or weakened somehow. Naruto senses this and instead of taking advantage, he offers his help. He uses his own chakra to soothe her or protect her from whatever is threatening her. This act of kindness surprises the Fem Kyuubi. She has never experienced such a selfless act from a human before. This makes her lower her guard and start to trust Naruto. They then start to interact more often, with Naruto bringing her stories from the outside world and the Fem Kyuubi sharing her ancient knowledge with him, thus forming a friendship.
In some fanfictions, Naruto might start by trying to understand the Kyuubi's pain. He could use his own experiences of being an outcast in the village to empathize. As he shows this understanding, the Kyuubi begins to see him as different from the other humans who just fear it. They might start having conversations in Naruto's mindscape, gradually building a bond of mutual respect.
There could be a fanfiction where Fem Naruto discovers a hidden side of Fem Kyuubi. Maybe Fem Kyuubi has some memories or powers that were locked away and Fem Naruto helps her unlock them. This could set off a chain of events that not only changes the relationship between them but also has a major impact on the entire ninja world as they face new threats and opportunities together.
They could go on a journey to discover the origin of the Kyuubi's power. Naruto has always been curious about the power within him, and with the Fem Kyuubi as a friend, they could explore ancient places together. Maybe they find some long - lost scrolls that explain the true nature of the Kyuubi's power and how it was created. Along the way, they face various obstacles like traps set by ancient shinobi clans who wanted to keep this knowledge hidden.
A common scenario is when Naruto is on the verge of death. The Kyuubi realizes that if Naruto dies, it might also be in a bad situation. So, it decides to cooperate and in the process, they start to understand each other better and become friends. Another is when Naruto enters the Kyuubi's lair in his mindscape and instead of fighting, he tries to have a peaceful conversation, which leads to friendship.
I really liked 'Fem Kyuubi's Bond with Naruto'. In this fanfic, the fem Kyuubi forms a deep emotional bond with Naruto. The author does a great job of showing how they support each other through various challenges. It has some really cool fight scenes where the fem Kyuubi's unique abilities are shown, which makes for an exciting read.
One great fem Naruto x fem Kyuubi fanfiction could be one that focuses on their unique bond. It might explore how they interact in a world where Naruto is female and the Kyuubi also takes a female form. For example, it could show them teaming up against common enemies and how their combined powers are different from the original story.
In this type of fanfiction, the fem Kyuubi's possessiveness might be manifested in her protecting Naruto at all costs. She could be overly vigilant and not allow any harm to come near him. This could lead to her interfering in battles or situations where Naruto might be in danger, even if he doesn't necessarily need her help all the time. She may also try to monopolize his time, not wanting him to go on missions with other people or make new friends. Her possessiveness could also be expressed in a more emotional way, like getting sulky or angry when Naruto doesn't pay enough attention to her.
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.