Perhaps the plot could involve some sort of magic or curse that is causing Naruto to be in this state. The story might then focus on how the Naruto world's medical ninjas try to figure out what's wrong. They could run all sorts of tests and experiments. And there could be a race against time as Naruto's condition worsens.
The original Naruto story is mainly about friendship, hard work, and following one's dreams. This concept challenges it as it adds a rather strange and unorthodox element. It goes against the more positive and action - based themes of the original.
No way. The Naruto series has a large and diverse fanbase, including many young fans. Such inappropriate fanfiction is not in line with the family - friendly and positive nature of the Naruto franchise. Fanfiction should enhance the experience of the original story, not introduce inappropriate and unethical content.
In such a fanfiction, Naruto might be rejected by his friends or the village. This could lead to a deep sense of despair and loneliness. His chakra might be affected, and he could gradually lose his will to live. Maybe he'll stop eating or training, and his physical condition will deteriorate until he's on the verge of death.
Love and relationships are common themes. Often, it's about Naruto finding a special someone and the development of their romantic and deeper emotional bonds. Another theme is the exploration of new powers or abilities that come with these mating - like relationships. For example, if Naruto mates with a character from a different clan, they might inherit some unique skills.
Sasuke could be a great main character in such a fanfiction. He has a deep connection with Naruto. If Naruto's dying will flame is involved, Sasuke might be on a journey to understand what Naruto left behind and how to carry on his legacy. He could be conflicted between his own past and the new responsibility that comes with the dying will flame.
It could be Sasuke. If Sasuke completely rejects Naruto's friendship and the idea of coming back to the village, Naruto might be deeply hurt. He has always been trying to bring Sasuke back, and if Sasuke shuts him out completely, it could be a major factor in his downward spiral.
You could also look for fanfictions that focus on their cultural exchanges. Given that they are from different villages with different cultures, it can be interesting to see how they learn from each other, like Gaara learning about Konoha's traditions from Naruto or vice versa.
There are many fanfictions out there, but'mating' related ones often cross inappropriate boundaries. In the Naruto fandom, there are much better fanfictions that focus on their friendship, battles, and growth. For example, some fanfictions explore how Naruto and Gaara's relationship changes from being rivals to comrades, which is more in line with the spirit of the original work.
One idea could be exploring a pairing like Naruto and Hinata in a more in - depth mating scenario where they deal with the cultural and family aspects of starting a family together. Another could be a fanfiction about how Naruto's unique powers might be passed on to his offspring in a mating - related story. Maybe a story where Naruto has to choose a mate among different potential candidates from different villages to strengthen alliances.