In the fanfiction, there could be a situation where an enemy attacks the beach area where female Naruto and her friends are having a swimsuit party. Female Naruto, in her swimsuit, quickly springs into action. Kurama's power surges through her, and she uses her ninja skills combined with the unique situation of being in beachwear. For example, she might use her swimsuit's fabric as a distraction or a binding tool against the enemy.
One idea could be that Fem Naruto enters a beach volleyball tournament on the Hidden Sand's beach while wearing a Kurama - themed swimsuit. Her unique look attracts a lot of attention and she has to deal with both admiration and jealousy from other competitors.
The plot could be that female Naruto is training near a beach. She decides to take a break and put on a swimsuit. Kurama, inside her, is initially grumpy about this break. But then, they notice some strange energy coming from the ocean. They team up, with Naruto in her swimsuit, to investigate. Along the way, they meet new characters who are also intrigued by the strange energy.
In the fanfiction, the plot could revolve around Fem Naruto being part of a swimsuit fashion show in the ninja world. Her Kurama swimsuit is the centerpiece. She has to face off against some rival ninjas who are also models. Along the way, she discovers that there's a conspiracy to disrupt the show, and she uses her ninja skills to stop it and make the show a huge success.
A great fanfiction concept could be set in an alternate universe where Naruto was born with an even stronger bond to Kurama. This connection allows them to communicate telepathically from a very young age and they train together secretly, leading to Naruto being much more powerful early on in his ninja career. For example, they could develop new jutsus that are a fusion of Naruto's human skills and Kurama's chakra powers. This would change the whole dynamic of how Naruto interacts with his friends, enemies, and the village, as he has to keep this secret power a secret from everyone, including his sensei.
Perhaps there's an enemy who is only attracted to beautiful women in swimsuits and Naruto uses the Henge to lure the enemy into a trap. He has to perfect his female mannerisms and appearance to be convincing enough to draw the enemy in. Along the way, he might get help from Ino to style his 'female' look.
Maybe the female Kurama was once a human who was transformed into a Kurama due to a powerful curse. In the fanfiction, Naruto could help her break the curse. This would create a deep emotional bond between them as they go through the process of understanding her past and finding a way to reverse the transformation.
One plot could be that the female Naruto is the only one who can calm Kurama during his rages. This gives her a special role in the village. She has to balance her normal ninja training with the responsibility of keeping Kurama in check. It could lead to some interesting situations where she has to use her wits and newfound bond with Kurama to save the village from threats.
In a fanfiction, imagine a scenario where Naruto loses control of Kurama during a battle, and Gaara is the only one who can calm him down. Gaara uses his own experiences with his tailed beast to reach out to Naruto and Kurama. This could lead to a deeper understanding between the three characters and a strengthening of their bonds.
One idea could be that Kurama is trapped in a special jail within Naruto's mind. Maybe it's a result of some dark magic or a side effect of a new jutsu Naruto attempts. In the fanfiction, Naruto could be desperately trying to find a way to free Kurama while also dealing with the internal chaos that Kurama's imprisonment causes within him.
Perhaps in the fanfiction, the female Kurama forms a special bond with Naruto where she can transfer some of her unique powers to him in a different way than in the original story. This could lead to Naruto developing new jutsu and facing new enemies that are attracted by this new power. For example, a group of rogue ninjas who want to steal this power-transferring ability.