Well, in some 'naruto gets fox tails' fanfictions, the fox tails could be a symbol of his deeper connection to the Nine - Tails. It might lead to him having more control over the fox's chakra and even unlocking some ancient and powerful techniques that were previously unavailable. Maybe he uses the tails to communicate with the Nine - Tails on a more spiritual level, leading to a whole new arc in his journey.
One interesting 'naruto gets fox tails' fanfiction could be where Naruto gains the fox tails as a new form of power. This might change the way he battles and interacts with other characters in the Naruto universe. For example, he could use the tails for enhanced speed and strength in combat, or for new jutsu combinations that are unique to this form.
There are fanfictions where Naruto getting fox tails is a result of a special ritual or a powerful curse. This could create a whole new set of challenges for him. He might have to deal with the negative effects of the tails at first, like being ostracized by some villagers who fear his new form. But as the story progresses, he learns to master the tails and use them for the greater good, becoming an even more powerful and respected ninja in the process.
One interesting 'Naruto Gets Nine Tails' fanfiction could be where Naruto has an even deeper connection with the Nine - Tails than in the original series. For example, he can communicate with it telepathically without any chakra interference. Another one might be a fanfiction where Naruto uses the Nine - Tails' power in creative ways to solve problems that the original Naruto couldn't. Maybe he uses it to heal instead of just for combat.
A unique plotline could be that Tails is turned into a girl as part of a prophecy. In this story, she has to fulfill certain tasks in her new form to save the Sonic world. It adds an element of destiny and adventure to the whole transformation concept.
There might be a fanfiction where the Two Tails has a special bond with a particular character other than the Jinchuriki. For example, it could form an unexpected alliance with a rogue ninja and they go on adventures together.
One 'Naruto has tails' fanfiction could be about Naruto's struggle to control the new power that comes with the tails. Maybe he has to learn special jutsus to manage it without going berserk.
Honestly, I haven't read a particular 'naruto gets fox tails' fanfiction that I can single out. However, when you search for it, look for ones with high ratings and a lot of reviews. Those are usually the better ones. Also, pay attention to the author's writing style. If you like detailed descriptions and character development, find a fanfiction that seems to focus on those aspects while still having the 'naruto gets fox tails' concept.
One possible 'tails the fox sick' fanfiction could be about Tails getting a strange illness that makes him lose his ability to fly temporarily. The other characters in the Sonic universe might then have to come together to help him find a cure.
Some fanfictions may explore Naruto getting a girlfriend in a completely alternate universe. Maybe in a modern - day setting where Naruto is just an ordinary high school student and he meets a girl who has no idea about his ninja past, which leads to a very different kind of relationship.
One popular 'Naruto gets possessed' fanfiction is 'Possessed Naruto: The Dark Path'. In this fic, Naruto is possessed by a powerful and ancient spirit, which leads to a whole new set of challenges for him and his friends. Another one could be 'Naruto's Possession: A New Power Unleashed', where the possession actually gives Naruto some unexpected abilities that he has to learn to control.
Another cool plot twist could be that the Ten Tails has the ability to split into multiple smaller entities, each with its own unique power. This would force Naruto and his friends to come up with new strategies to deal with these new threats. And it might also lead to some of these smaller entities turning good and helping Naruto in unexpected ways.
A great 'naruto fox tail' fanfiction could revolve around the idea that the fox tail can transform into different objects or weapons. Naruto discovers this ability by accident and has to learn how to control it. This could lead to some really unique battle scenes where he surprises his opponents with his newfound power. Some fanfictions might also explore how his friends react to this new aspect of Naruto's powers related to the fox tail.