The Akatsuki could be antagonists. They might see Kushina's return as a threat to their plans. Since Kushina is a powerful Uzumaki, her presence could disrupt their schemes related to the tailed beasts. They could try to stop her from reaching Naruto or even try to capture her for their own purposes.
In such a fanfic, perhaps Kushina manages to break free from the afterlife's constraints. She could use some sort of ancient jutsu that allows her to return to the living world. Then, she starts her journey to find Naruto. Maybe she disguises herself as an ordinary traveler at first to observe Naruto from afar, seeing how he has grown and all the hardships he has faced. Once she reveals herself, Naruto is initially shocked but then filled with joy at the thought of having his mother back.
The plot could be that Kushina wants Naruto to reunite with his father. She could use her spiritual connection to Naruto to plant the idea in his mind. Naruto then embarks on a journey to find out more about his father, Minato. Along the way, he discovers secrets about the past, including how his parents really met and fell in love. This could also lead to him unlocking new powers related to his family lineage.
In a fanfiction, Kushina could want Naruto to master a unique jutsu that she had always dreamed of but was unable to achieve herself. This could be a jutsu that combines the power of the Uzumaki clan's sealing techniques with some other element, like wind. And she would be guiding Naruto in his journey to master it, through some kind of spiritual connection.
Kushina could also seek the help of other powerful shinobi. For instance, she might ask Minato for assistance. Since Minato was Naruto's father and also a very skilled ninja, together they could come up with a plan to reunite with Naruto. Maybe they would use some sort of space - time ninjutsu to get closer to him.
One possible fanfic could be about Kushina's early days in the Hidden Leaf. It might explore her training as a ninja, her relationships with her peers, and how she was perceived in the village. Maybe it delves into her friendship with Mikoto and how they supported each other during their pregnancies.
A simple plot could be that Kushina's spirit appears to Naruto and tells him about her wishes for him. He then sets out on a journey to fulfill those wishes, facing various challenges along the way. For example, he might have to battle an old enemy who is trying to stop him from achieving what Kushina wants.
Yes, it is. In the original Naruto story, Kushina is Naruto's mother and their relationship is based on love and protection. The idea of her wanting Naruto's body goes against this fundamental relationship and is very disturbing as it implies a perversion of the mother - son bond.
Perhaps in the 'naruto bangs kushina fanfic', there is a plot where Naruto discovers a hidden power within Kushina that was never explored in the main series. This power could be crucial in saving the village from a new and powerful threat. He then has to work with Kushina to harness this power and protect their home.
Naruto's reaction could be complex. On one hand, he would be extremely excited. But on the other hand, he would be worried about the consequences. He has learned about the balance of the ninja world and might be afraid that bringing Kushina back could have negative impacts. However, his love for his mother would probably overpower those concerns in the end, and he would still strive to make her return a reality.