Well, it could be about Naruto coming back with two special swords. Maybe he got them during his time away on some new adventure. He might use these swords to fight stronger enemies in the ninja world, like some new evil organization that has emerged while he was gone.
There could be a group of anti - ninja revolutionaries as the main antagonists. They see Naruto's return with the swords as a threat to their plan of overthrowing the existing ninja order. They try to take the swords from Naruto to use them as symbols of their new regime, believing that the power of the swords will help them convince other ninjas to join their cause.
Well, the swords could be symbols of his power. Maybe one sword represents his physical strength and the other his mental acuity in the fanfiction world.
The use of legendary swords in Naruto fanfiction can also change the power dynamics between characters. A character who might not be as strong in the original series could become a formidable force with the aid of a powerful sword. Say, a side character gets hold of the Kubikiribocho and suddenly becomes a key player in battles, creating new and interesting storylines.
One possibility in this fanfiction could be Naruto somehow getting involved with the power of the 7 Wizarding Swords. Maybe he is transported to a world where these swords exist and has to learn to use their magic in his own unique ninja way. He could combine his chakra with the magic of the swords to create new and powerful attacks.
It's possible that they were given to him. A wizard or a master swordsman in the fanfiction might have recognized Percy's potential and bestowed the two swords upon him as a means to help him on his journey. This would also create a sense of obligation or mentorship in the story.
In some Naruto fanfictions, Naruto might gain the ability to conjure swords through a special training arc. Maybe he discovers a new chakra technique that allows him to materialize swords from his chakra. For example, if he combines his wind - style chakra with some ancient sealing jutsu he learned, it could result in sword - conjuring ability.
They're often made more powerful. For instance, the Samehada might be shown to have even greater absorption abilities in fanfic. It could absorb not just chakra but also other forms of energy.
In such a fanfiction, Naruto might obtain all seven swords through a series of epic battles and adventures. Maybe he defeats the previous owners one by one in honorable combat and claims the swords as his trophies. Another possibility is that he stumbles upon a hidden treasure trove where all the swords are stored, and by some twist of fate, he becomes their rightful wielder.
In some fanfictions, Naruto might return to Konoha to a cold reception because the villagers still hold grudges from his past. Maybe they haven't fully accepted his power or the chaos he sometimes brought. For example, they could be afraid of his Nine - Tails power flaring up again and causing destruction.