Well, some fanfiction writers might want to put a new spin on the Naruto universe. They might think that the typical relationships in the original series are too predictable or have been explored too much. So, they come up with this idea of Kurenai cheating on Naruto to introduce a fresh concept. It could also be inspired by other stories or real - life relationship scenarios where cheating occurs. The writer may want to transfer those complex emotions and situations into the Naruto world, even if it seems quite out of character for the two at first glance. This allows for a whole new set of stories and interpretations within the Naruto fandom.
One reason could be for the sake of creating drama. Fanfiction writers like to add intense emotions and conflicts to their stories. By having Kurenai cheat on Naruto, it creates a huge emotional upheaval for Naruto's character, which can lead to interesting character development arcs within the fan - created story. It also gives the writer a chance to explore how Naruto would react in such a difficult situation, which might be different from his usual optimistic and determined self in the original series.
I'm not entirely sure if there is a specific 'Naruto cheated on by Kurenai' fanfiction. Fanfiction websites are full of a huge variety of stories, and it could be quite difficult to find one with such a specific plot. You could try searching on popular fanfiction platforms like FanFiction.net or Archive of Our Own using relevant keywords, but keep in mind that the Naruto fandom has a wide range of story themes, and this might be a rather unusual one.
Naruto might be initially shocked and heartbroken. He is someone who values loyalty and friendship deeply, so being cheated on would be a huge blow to him.
It could be related to their different personalities. Naruto is very outgoing and impulsive, while Kurenai is more calm and reserved. In the fanfiction, their clashing personalities might lead to Naruto developing a dislike for her. Naruto might feel that Kurenai is too strict or unapproachable, which causes him to hate her.
There could be many interpretations in such a fanfiction. Maybe it shows Naruto's vulnerability in relationships. It might be a way to explore his character deeper by putting him in a difficult emotional situation.
One possible reason could be a misunderstanding. Maybe Naruto was misidentified as a threat in a tense situation. For example, if there was some sort of dark jutsu at play that clouded Kurenai's judgment and made Naruto seem like an enemy. Another reason might be that Kurenai was under some sort of mind - control. There are many villains in the Naruto universe who are capable of such things. If she was being controlled, she might unknowingly attack Naruto.
There would be a lot of shock and disappointment among fans. Naruto and Hinata are a beloved couple, and fans who have followed their story would find it hard to accept such a plot. Many would probably criticize the author for going against the essence of the characters.
Family. It could focus on how Naruto and Kurenai form a new family with the baby. They learn about parenting, love, and sacrifice.
Maybe in a fanfiction where Kakashi is mind - controlled. It could lead him to harm Naruto without his normal self - control.
It could be due to some fans' different interpretations of the characters. Maybe they see a certain chemistry between Sasuke and Karin in the original series that they want to explore further, even if it means creating a scenario where Sasuke cheats on Sakura. Also, fanfiction is a place for creativity and exploring different possibilities, and this is just one of the many extreme or different ideas that can come out of that.
In such a fanfiction, Naruto's upbringing would be different. Kurenai could teach him her unique jutsu from a young age. The story might focus on how Naruto's personality, which is usually influenced by his loneliness as an orphan, would change. He could have a more stable family environment, which would impact his relationships with Sasuke and Sakura. There could also be new story arcs involving Kurenai's past and how it relates to Naruto's future.