Well, it could be about Naruto accidentally breaking something precious of Tsunade's, like a family heirloom. This might lead to a series of events where Tsunade is initially angry but then Naruto makes it up to her in some heroic way, perhaps by going on a difficult mission for her.
In the 'naruto breaks tsunade fanfiction', it could also be that Naruto breaks Tsunade's concentration during an important medical procedure or battle plan. Naruto being his impulsive self, barges in or does something silly that disrupts Tsunade. As a result, she has to deal with the consequences and Naruto has to learn to be more cautious around her important tasks.
Maybe in this fanfiction, Naruto breaks Tsunade's trust. He might do something that goes against her orders or beliefs. For example, he could make a deal with an enemy in order to save his friends. Tsunade would be disappointed and Naruto would have to work hard to regain her trust, like by proving that his actions were for the greater good in the long run.
It could be Orochimaru. He might use Naruto's actions of breaking something related to Tsunade (like a seal she was relying on) to his advantage. Orochimaru could manipulate the situation to make Tsunade look weak or to cause chaos in the village.
In this fanfiction, perhaps Naruto breaks Kaguya by outsmarting her. He could use his quick thinking and knowledge of her weaknesses. He might form alliances with other characters in ways that give him an edge over Kaguya, and then use his signature Rasengan in a new and unexpected way to break her power.
In this type of fanfiction, perhaps Naruto is exiled due to some false accusations. Maybe there's a misunderstanding about his power or some events he's involved in are misconstrued. Tsunade, as the Hokage, might feel pressured by the village elders or some political situation to exile Naruto.
Well, it could be about Naruto having to deal with the unique situation of being Tsunade's son. Maybe he'd inherit some of her strong - willed nature. He might also face different expectations from the village.
Maybe a dark force takes over Naruto's mind. This force could be an ancient evil that has been sealed away for centuries and now wants to create chaos in the ninja world. It uses Naruto as a puppet to kill Tsunade, one of the most powerful protectors of the village. The story could then focus on Naruto's friends trying to free him from this control and avenge Tsunade.
Perhaps in the fanfiction, it's a plot device to show a different side of Tsunade. She might be under the influence of a strange jutsu that makes her act out of character and kiss Naruto. This could then lead to a comical chain of events as Naruto tries to figure out what's wrong with Tsunade and the other characters react to this unexpected display of affection. The fanfiction could then focus on how Naruto has to deal with this new situation and keep it a secret from some of the more conservative characters in the village.
Well, perhaps Erza might reject Naruto's feelings in a cruel way. Maybe she tells him she loves someone else, like Jellal. This would break Naruto's heart as he is used to being persistent in love, like his feelings for Sakura in the original series.
A possible plot could be that Naruto, under the care of Tsunade and Jiraiya, discovers new aspects of his heritage. Tsunade might know some secrets about the Uzumaki clan that she shares with Naruto. Jiraiya, being his godfather - like figure, helps him explore these new revelations. Meanwhile, the Akatsuki could still be a threat, and Naruto, with his new skills and knowledge, has to fight against them to protect the village and his loved ones.
One possible plot could be that Jiraiya and Tsunade decide to adopt Naruto after seeing his loneliness and potential. They start training him not just in ninja skills but also in life values. Jiraiya might teach him more about the toad sage techniques, while Tsunade could help him with his chakra control and medical ninjutsu knowledge. Naruto would grow up in a more stable family - like environment, which would change his personality a bit, making him more confident and less brash as he has the support and love of two powerful ninjas.
Well, it could involve Tsunade using her medical ninjutsu to heal Naruto from a near - fatal injury. Maybe Naruto was in a tough battle against a powerful enemy and Tsunade arrived just in time. She might have to use some of her most advanced healing techniques to save his life.