She might be disgusted. Smoking isn't a common or acceptable behavior in the ninja world. So Kurenai could immediately tell Naruto to stop and throw away the cigarette.
One consequence could be that Kurenai reports Naruto to someone in authority, like Iruka or Kakashi. They might then have a serious talk with Naruto about setting a good example for the younger ninjas. Also, it could potentially damage Naruto's reputation among his peers, as smoking isn't really seen as a positive thing in the ninja world.
I'm not entirely sure if there is a specific 'naruto is kurenai son fanfiction' out there. Fanfiction platforms are filled with all sorts of creative ideas, but it can be difficult to know for sure if there is one specifically for this concept. You could try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Maybe start with searching for Naruto - Kurenai family relationship or something similar to see if any relevant stories pop up.
In most Naruto fanfictions, there is no such plot where Kurenai cheats on Naruto because they don't have that kind of relationship in the original story. Kurenai has her own story arc mainly related to Asuma. So it's very unlikely to find such a scenario in regular Naruto fanfictions.
It would be more nurturing. Kurenai could cook for Naruto, like making him some of her special ninja - style meals. And she'd be there to listen to his problems, whether it's about his love life or his struggles with mastering new jutsu. Their relationship would be based on mutual trust and respect, just like a real sister - brother relationship.
Well, in this fanfiction, Naruto might be so caught up in his training and missions that he forgets about proper hydration. Regarding the smoking aspect, it could be that in a new, darker part of the ninja world he discovers, smoking is more common. He could start to neglect his health as he tries to fit in or understand this different side of the world. His neglect of drinks and potential smoking habit could then become a source of conflict with his old friends who are worried about him.
Kurenai could impact Naruto's growth in many ways. Her help might start with simple things like improving his basic ninja skills. As she is an experienced jonin, she could correct his stances or his chakra control in certain jutsus. But more importantly, her influence could be on his mental state. Naruto often rushes into things. Kurenai could teach him patience and how to analyze a situation better before acting. This would not only make him a better fighter but also help him in his long - term goal of becoming Hokage as he would be more respected by the villagers for his wisdom and not just his power.
Their relationship might start off rocky due to the sudden nature of the arranged marriage. Naruto might be a bit clumsy in trying to understand Kurenai at first. But as time passes, he'll see her wisdom and strength. Kurenai, on the other hand, will come to appreciate Naruto's determination. They'll start to share their stories, like Naruto telling Kurenai about his adventures with Sasuke, and Kurenai sharing her experiences as a ninja. This sharing will bring them closer.
Yes, there are likely some fanfictions out there about Naruto and Kurenai having a secret love. Fanfiction writers often explore different pairings and relationships within the Naruto universe. You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own to find such stories.
One possible funny fanfiction could be about Naruto trying to prank Kurenai and Anko at the same time. He sets up a series of comical traps around the training ground. Kurenai, with her sharp perception, starts to notice something is off but Anko just blunders right into the first trap, which sprays her with a bucket of colored water. Naruto is hiding in the bushes trying not to laugh out loud. Then Kurenai pretends not to notice Naruto's presence and lures him out by acting like she's falling for another of his pranks, and when he jumps out, she surprises him with a little genjutsu that makes him see a horde of angry Ankos chasing him.