One possible plot could be that Naruto discovers Kurenai and Anko are trapped in a genjutsu created by a rogue ninja. Naruto, using his own powerful chakra and his experience with breaking genjutsu, manages to free them. Then, together, they fight off the rogue ninja.
In a fanfiction scenario, perhaps Kurenai is in a dangerous mission and gets trapped in an illusion created by an enemy. Naruto, with his strong will and the help of his Nine - Tails chakra, is able to break through the illusion and save her. He then helps her complete the mission and they become closer friends as a result.
The plot could involve Naruto, Kurenai, and Anko being shrunk down to the size of insects. They find themselves in a world that is now huge and full of danger. Naruto is excited as always and wants to explore. Anko is scared but trying to act tough. Kurenai is using her skills to find a way to reverse their situation. They end up having to team up with a group of friendly ants who help them find a magic flower that can restore their normal size. Along the journey, they face many comical obstacles like getting chased by a giant spider and trying to cross a river on a leaf boat.
One possible plot could be that Naruto, after achieving great things in the Hidden Leaf Village, realizes his feelings for both Anko and Kurenai. They start off as friends who support him, but over time, deeper emotions develop. Anko's wild and fearless nature and Kurenai's calm and intelligent demeanor both attract Naruto. They might face some initial opposition from the village elders as such a relationship is unconventional. But Naruto's status as a hero could help sway opinions. Eventually, they build a life together, with Naruto learning different aspects of life from each of them.
One possible plot could be that Naruto, as their brother, grows up with a different kind of support system. Kurenai and Anko could train Naruto in their unique ways. For example, Kurenai might teach him more about genjutsu, while Anko could pass on her knowledge of snake - related jutsus. This could lead to Naruto having a more diverse skill set early on and changing the way he approaches battles in the original story.
Maybe Naruto is trapped in a dangerous place, like a collapsing cave during a mission. Anko, with her quick thinking and combat skills, and Kurenai, who is very strategic, find him. Anko could break through any physical barriers in the cave, and Kurenai would use her genjutsu to keep Naruto calm so he doesn't panic and make the situation worse. Together, they get him out of there.
A possible plot is that Naruto discovers a strange lemon - shaped artifact. Anko and Kurenai, being more experienced, help him figure out what it is. It turns out to be a key to an ancient ninja treasure. But they have to face various challenges and enemies who also want the treasure.
Well, it could be about Anko and Kurenai seeing Naruto's lonely situation and deciding to take him in. Maybe they start teaching him things that Jiraiya or Kakashi didn't. For example, Anko could teach him some of her more unorthodox ninja skills, and Kurenai could help him with his emotional intelligence and how to better understand others, especially in the context of his relationships with his peers.
In such a fanfic, perhaps Naruto discovers a new power or technique that Kurenai and Anko are in need of. Naruto then offers to teach them in exchange for their help in his own personal ninja goals. As they train together, they form a close-knit group and support each other through various challenges in the ninja world.
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.
Well, in such a fanfiction, Naruto might use his unpredictable nature to bluff in poker. Kurenai, with her calm and collected demeanor, could be really good at reading opponents. And Anko, being a bit wild, might make some risky moves. Maybe they're playing poker as a way to relax between missions or it could be part of a training exercise where the winner gets a special prize.