One common theme is redemption. Since Toneri had some rather villainous actions in the original Naruto story, many fanfics focus on him making amends and becoming a better person. For example, he might try to repair the damage he caused to the ninja world.
Friendship is also a major theme. Since they come from different worlds, the development of a friendship between Toneri and Naruto is often explored. Their bond can be formed through shared battles, cultural exchanges, or mutual respect for each other's abilities. In some fanfics, this friendship becomes the cornerstone for peace between their two realms.
One popular Toneri Naruto fanfic is 'Toneri's Redemption'. In this fanfic, Toneri is given a chance to rewrite his past mistakes. It shows his journey of self - discovery and how he tries to fit into the world of Naruto after his initial actions. The story is filled with interesting character interactions, especially between Toneri and Naruto.
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.
One popular 'toneri x naruto fanfic' is 'A New Bond'. It explores an alternate universe where Toneri and Naruto have to team up against a new threat that endangers both the Hidden Leaf Village and Toneri's moon realm. Their relationship develops from initial distrust to a strong friendship as they face challenges together.
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.
Well, Naruto would probably be in a great deal of pain. He might double over and be unable to move for a while. It could also lead to a big argument between him and Sakura, with Naruto feeling betrayed and Sakura perhaps realizing she overreacted.
In the fanfic, Sakura might be influenced by some dark force or a bad character. She starts to act against Naruto and their friends. Naruto, being the hero, tries to reason with her first but when she attacks him, he punches her back. This punch snaps her out of the influence, and they join forces again to fight the real enemy.
It would likely strain their relationship at first. Sakura would probably be very angry and hurt, both physically and emotionally. She might start to question Naruto's true nature and whether he really was the friend she thought he was.