There could be many unknown authors writing such a fanfiction. It might be a new and emerging writer in the Naruto fanfiction community who just had this interesting and somewhat out - of - the - box idea. It's really hard to determine a specific author without more information.
One possible plot could be that Kushina has some misunderstanding about Sakura. Maybe she thinks Sakura is being disrespectful to Naruto in some way, so she punches her to teach her a lesson. Then, Sakura tries to figure out why Kushina is so angry and they start a series of interactions that eventually lead to them resolving their differences.
On Naruto's side, he would probably feel guilty after realizing what he had done. This guilt could make him try to make amends, but Sakura's initial reaction of anger and hurt would still be a big obstacle in their relationship. Their interactions would be filled with tension and awkwardness.
In some fanfictions, Sakura's punch might be part of a comical situation. For example, Naruto says something really stupid and Sakura just can't help but punch him. But this punch then leads to a series of adventures as Naruto tries to get back at her in a friendly way.
I recommend 'The Punch that Changed Everything'. In this fanfiction, Sakura's punch makes Naruto see the error of his ways regarding a certain mission. It's a short but impactful read.
Sakura is typically shown as intelligent and determined in these fanfics. Her development from a somewhat insecure girl to a confident ninja is often explored. Kushina is characterized by her boldness and tenacity. When they are in a fanfic together, their relationship can vary. It could be a friendship where they bond over their love for the village or their shared experiences with difficult situations. Maybe Sakura admires Kushina for her strength and Kushina sees potential in Sakura, leading to a relationship of mutual respect and support.
Sakura and Kushina might be similar in fanfiction when it comes to their maternal instincts. Kushina was a loving mother to Naruto, and Sakura, in some fan - created scenarios, might be shown with strong maternal feelings towards her friends or potential children. Additionally, their ability to hold their own in a fight could be a common trait.
Perhaps there was some sort of dark influence at play. In the world of Naruto, there are often dark forces and genjutsu (illusion techniques). It's possible that Naruto was under the influence of a genjutsu that made him see Sakura as a threat, so he punched her in self - defense without realizing it was an illusion.
Well, one possible consequence could be that Naruto is seriously injured. Maybe he has a broken bone or gets knocked out cold. It could also lead to some sort of rift between them, with Naruto feeling betrayed by Sakura's overly aggressive action.
There might be. Fanfiction communities are quite diverse, and with the popularity of the Naruto series, fans often come up with unique pairings. However, the availability can vary. Some fanfiction platforms have a large number of Naruto - related fanfictions, so it's worth checking those. But it's also possible that the specific pairing of Kushina x Sakura may not be as common as some other pairings in the Naruto fandom.