There could be. Fanfiction is a vast world where all kinds of scenarios are explored. But it's not something that is part of the official Naruto storyline. You can try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just keep in mind that the content may be quite different from what you expect based on the original series, and it may also not be appropriate in some ways.
Naruto would support Kurenai by being her emotional pillar. He has a very empathetic nature, so he would listen to her concerns about the pregnancy, like her fears for the baby's health or how she's going to be a mother. He would offer words of encouragement and tell her she's going to be a great mom.
Well, perhaps in this fanfic, the pregnancy could be a result of a special mission or some sort of magic that binds Kurenai to a character. And Naruto, being the hero he is, gets involved to help Kurenai understand and deal with the situation. He could also help her face the reactions of the village, which might be mixed since Kurenai is a respected shinobi.
One potential consequence is that it could cause a stir among more traditional fans. Since it goes against the established relationships in the Naruto series, some fans might be offended. They might see it as disrespectful to the original story and characters.
There are some out there. You can check fanfic websites like FanFiction.net or Archive of Our Own. However, keep in mind that the quality can vary greatly. Some might focus on how the pregnancy affects Kurenai's relationships within the Naruto universe, like with Asuma's friends or her students.
It could be Asuma. Since they had a relationship in the original series, it would be a logical choice. Their relationship was a significant part of the story, and having him as the father would add depth to the fanfiction, with the story exploring their future together as parents.
Tenten could be one of the characters. She could be Naruto's friend and also have a bit of a crush on him. Ino might also be present, using her mind - related jutsu to try and understand the complex relationships in the harem. Rock Lee could show up too, providing some comical relief and also being Naruto's loyal friend in the midst of all the relationship chaos.
Well, in this rather interesting scenario, their relationship could be one of protectiveness. Naruto, with his big heart, might see it as his duty to safeguard Kurenai during her pregnancy. He could bring her food and keep her company, sharing his stories of his ninja adventures to keep her entertained.
In a Naruto Kurenai pregnant fanfic, the plot could focus on the medical aspects as well. Given the unique world of Naruto with its own medical ninjutsu, it could show how the village's medical team takes care of Kurenai during her pregnancy. Maybe there are some complications that only the special ninja medicine can solve. Additionally, the plot could involve Kurenai training in a different way during her pregnancy to keep her skills sharp but also be safe for the baby. This could lead to her developing new techniques or modifying her old ones. And of course, there could be a sub - plot about the other characters' anticipation of the new addition to the village.
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.