It might be an old enemy of Naruto who has come back for revenge. For example, someone from the Akatsuki who wasn't completely defeated before. They could target Naruto again and put him in a life - threatening situation, which makes Kurama cry.
It could be related to Naruto's struggle with his own identity. Naruto has always been an outcast in the village to some extent. If he starts to doubt himself or his place in the world, Kurama, being a part of Naruto, might cry seeing Naruto's internal turmoil.
In this 'fem kurama is possessive of naruto fanfiction', Fem Kurama might have some complex character traits. Her possessiveness could indicate that she is extremely loyal to Naruto. However, this loyalty can be misconstrued as over - possessiveness. She may be a bit controlling, thinking she knows what's best for Naruto. At the same time, she could be a very emotional character, with her possessiveness being a manifestation of her deep affection for Naruto. This could lead to her being impulsive at times, especially when she feels Naruto's safety or their relationship is being threatened.
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.
There's also a fanfic titled 'Fem Kurama's Influence on Naruto'. This one delves into how the fem Kurama's different personality traits, being more nurturing perhaps, impact Naruto's growth as a ninja. It's really fascinating as it gives a fresh perspective on Naruto's development.
Another theme is friendship and loyalty. The relationship between fem Naruto and Kurama is usually portrayed as a very deep and loyal one. They support each other through various difficulties, like in the fanfic 'Fem Naruto's True Ally' where Kurama stays by fem Naruto's side even when the whole village is against her.
The possessiveness of Fem Kurama towards Naruto can significantly impact the plot. She might be overprotective and not let Naruto make his own choices. For example, when it comes to his training or choosing missions. This could create tension between Naruto and other characters like his sensei who believe in a different approach. Also, it might lead to some internal struggle for Naruto as he tries to balance his loyalty to Fem Kurama with his own desires to be a free - spirited ninja.
Another interesting plot might be that the female Kurama reveals to Naruto secrets about his family. Maybe there are hidden connections between his family and the origin of Kurama. This would add a whole new layer of mystery and depth to Naruto's character development.
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.
In such a fanfiction, Naruto might have a very different upbringing. The female Kurama could teach him unique forms of chakra control and ninja skills. Maybe she would be more nurturing, leading to a Naruto who is more confident and less of an outcast in the village at an earlier stage.