A possible plot could revolve around Kakashi's team members' reactions to Naruto being his son. For example, Obito's spirit (if it has any influence) might have mixed feelings. And in the story, Naruto might inherit some of Kakashi's unique abilities in a more natural way than in the original series. The fanfiction could also explore how the Akatsuki views Naruto differently, knowing he is Kakashi's son, and how that affects their plans to capture the nine - tailed beast within him.
In some fanfictions, there might be a plot where Kakashi's past traumas are related to Naruto's current challenges. For instance, Kakashi's experience with losing his comrades could be used to help Naruto deal with the potential loss of his friends. Or perhaps a plot where Kakashi's family secrets are revealed and they have a significant impact on Naruto's growth as a ninja. This could involve a hidden jutsu or a prophecy that ties them together.
One possible plotline could be Naruto growing up with Kakashi's unique training methods. Since Kakashi is known for his strict and strategic training, Naruto might become an even more formidable ninja at a younger age. He could inherit Kakashi's Sharingan abilities in some creative way in this fanfiction world, which would give him a whole new set of skills to master.
A plot might involve Kakashi getting injured severely on a mission, and Sakura, in the process of taking care of him, realizes her true feelings for him. They then decide to get married. However, Kakashi's past traumas start to surface and affect their relationship. Sakura has to use her medical and emotional skills to help him through it. And in the end, they emerge stronger as a couple. There could also be a plot where an outside force tries to break them apart because they see their combined strength as a threat. But they fight against it and prove that their love is stronger.
One possible plot could be that they are in a dangerous situation together, like facing a powerful enemy. In the heat of the moment, they realize their feelings for each other and share a kiss. Another plot could be that Tsunade is injured and Kakashi, while taking care of her, they have a tender moment and kiss.
One possible plot could be that they accidentally end up in a situation where Sakura becomes pregnant, and then they have to deal with the reactions of their friends and the ninja community. Another could be that it's part of a planned future for them, and the fanfiction focuses on their preparations for the baby.
One possible motive could be to help Naruto control the Nine - Tails' chakra better. Hypnosis might be a way to reach into Naruto's subconscious and find a way to coexist with the powerful force inside him.
One possible reason could be that Kakashi is preoccupied with other important matters in the village. Maybe he has some top - secret missions or tasks assigned by the Hokage that demand his full attention, leaving him with little time to focus on Naruto.
One reason could be that he sees Naruto as a younger version of himself in some ways. Both have had their share of loneliness and challenges growing up. Kakashi may want to prevent Naruto from going through the same pain he did. Another reason is Naruto's importance to the village. As the jinchuriki of the Nine - Tails, Naruto is a key asset. Kakashi, being a loyal ninja, wants to protect the village's future which is tied to Naruto.
One possible reason could be that Naruto might feel Kakashi is too strict with his training. Maybe Kakashi's methods are too harsh for Naruto, making him frustrated and gradually developing dislike.
One possible reason could be Kakashi's reputation as a strict and powerful teacher. Naruto might be in awe of his skills and fear making mistakes in front of him.