The plot could develop in a way where the village starts to notice her abnormal behavior. This could lead to her being ostracized or even hunted if they see her as a threat. Meanwhile, she's so focused on her love interest that she doesn't care about the consequences. Her yandere actions could also attract the attention of enemies who might try to use her emotions against her, adding more twists and turns to the fanfic.
The plot could start with the other characters being oblivious to her yandere nature. As the story progresses, her actions would start to raise suspicions. For example, if there's a training session and she gets overly aggressive towards someone who accidentally hurt her love interest during sparring.
At first, Naruto might be completely oblivious to the yandere Fem Sasuke's feelings. But as she starts to show her possessiveness more openly, he'll have to face it. This could lead to some arguments between them. However, over time, Naruto could start to see the good in her. He might realize that her love, although extreme, is genuine. And so, they could start to build a more trusting relationship. For example, she could open up to him about her past and why she's so protective, which would bring them closer.
Well, a yandere female Sasuke in a fanfic would likely be extremely possessive. She might go to great lengths to keep the object of her affection close. For example, she could be very jealous of any other character who gets too friendly with the person she likes. She'd probably use her ninja skills in sneaky ways, like spying on her love interest to make sure they're not interested in anyone else.
Start with a strong inciting incident. For example, Kaguya could be resurrected with a yandere - like obsession for Naruto due to some dark magic. Then, build up the conflict as Naruto tries to resist her advances while also dealing with the chaos she causes in the ninja world.
Think about a prophecy or a hidden power. Suppose there is a prophecy that says only the union of Uzumaki, Hyuga and Uchiha blood (represented by Naruto, Himawari and Female Sasuke respectively) can unlock a great power. This power is needed to save the ninja world from a coming darkness. The story can be about their journey to discover and master this power, with all the personal and external conflicts that come with it, like distrust from other ninja clans or internal struggles within the group.
One common theme is possessiveness. Since Sasuke is yandere, he is often extremely possessive of Naruto. Another theme is the struggle between his dark, obsessive feelings and Naruto's more free - spirited nature. For example, in many fics, Sasuke tries to keep Naruto close to him at all costs.
One popular 'yandere Sasuke x Naruto fanfic' is 'A Twisted Bond'. It explores Sasuke's possessive and obsessive nature towards Naruto in an interesting way. The story has some great character development moments and unique plot twists that keep you engaged.
In many such fanfics, Naruto's character often becomes more vulnerable yet also stronger in a different sense. His pregnancy makes him rely on Sasuke more, but at the same time, he is determined to still be a great ninja. Sasuke, on the other hand, becomes more nurturing. He steps up to protect Naruto and the unborn child, showing a side of him that was not as evident before.
Naruto would likely become more stable. With Anko as his adoptive mother, he'd have a stronger support system. He might be less impulsive as he has someone to guide him. Sasuke, on the other hand, could start to open up more. His cold exterior might soften as he experiences Anko's love and care. He could also learn to trust others more easily.
At first, it would be really awkward. Naruto might be all over the place, trying to make the best of the situation, while Sasuke would be cold and distant. But as time passes, they would start to communicate more. Naruto's positive attitude might slowly break down Sasuke's walls. They could start training together again, like old times, but with a new layer of closeness. Eventually, they might develop a deep respect and love for each other that goes beyond friendship.
A plot idea might be that Sasuke, in his yandere state, secretly follows Naruto everywhere. He then starts to eliminate any potential danger to Naruto, even if Naruto doesn't see it as danger. For example, if a merchant is a bit rude to Naruto, Sasuke might find a way to drive the merchant out of the village. Also, Sasuke could be very controlling about Naruto's missions, trying to ensure that he's always by Naruto's side during them.