Maybe in the fanfiction, Naruto's fox ears and tail are a result of a new jutsu gone wrong. This new jutsu was supposed to give him some sort of enhanced connection to the Nine - Tailed Fox's power, but instead it physically manifested these features. As a result, he has to figure out how to reverse it while also dealing with the reactions of his friends and the villagers. His friends might be initially shocked but then try to help him, while the villagers could be more fearful and start to treat him differently.
One idea could be that Naruto discovers his fox ears and tail have special powers. For example, the ears can detect danger from afar, like an enhanced sense of hearing. The tail could be used for balance during his high - speed ninja moves, making him even more formidable in combat.
The fanfiction could be set in an alternate universe where having fox ears and tail is normal for some ninjas. Female Naruto would be part of a group that is trained specifically to use their fox - like features in combat. There could be rival groups with different animal - like traits, and she has to fight for the honor of her fox - clan.
A possible plot is that Naruto's fox ears and nine - tails features are initially a source of fear and misunderstanding among the villagers. But as he starts to master these traits, he uses them to protect the village in unique ways. For instance, his nine - tails can create a powerful shield around the village when it's under attack, and his fox ears help him to coordinate the defense more effectively.
One idea could be that Naruto has to constantly hide his ears and tail from the villagers at first. This could add an extra layer of secrecy and danger to his early life, as if he's discovered, he might face more severe persecution than in the original story. Another plot idea is that his fox features give him unique abilities, like enhanced senses, which he has to learn to control.
A possible plot is that baby Naruto with his fox ears and tail is found by a group of friendly animals in the forest. They take him in and protect him from the villagers who might be scared of his appearance. As he grows up among the animals, he learns their ways of survival and also starts to discover his own ninja - like abilities that are related to his fox features.
In a more comical plot, Naruto's fox ears grow randomly one day. He has to go about his normal life in Konoha with these ears, causing all sorts of chaos. People keep mistaking him for a new kind of summon or some strange experiment gone wrong. His friends have to help him keep his spirits up while they search for a way to reverse it, if that's what he wants.
Another idea is that the fox ears and tail are a sign of a prophecy. In the fanfic, Naruto is the only one with these features and they mark him as the one who will bring balance to the ninja world. This could involve him having to face off against dark forces that want to prevent the prophecy from being fulfilled. He'd have to learn to master his new features to succeed.
Well, a plot could be that Naruto, in his female Kyuubi form with fox ears, gets kidnapped by an enemy who wants to use his power. Sakura then embarks on a solo rescue mission. She has to use her wits and combat skills to get through the enemy's lair and save Naruto.
In a fanfiction, Female Naruto with fox ears and tail might have a special connection to the Nine - Tailed Fox spirit. The fox ears and tail could be a sign of a deeper bond that she has with the tailed beast. This could lead to new jutsu or abilities that are related to both her femininity and the fox - like nature. For example, she could create illusions that are fox - themed or use her tail as a weapon in a more graceful way than normal attacks.
One plot idea could be that the fox companion has special powers that Naruto has to learn to control along with his own chakra. For example, the fox might be able to communicate with other animals and Naruto uses this to gather intelligence in battles or missions. Another idea is that the fox has a connection to Naruto's family history that he wasn't aware of before, leading to a discovery of a hidden jutsu or a secret about his clan.