One possible plot development could be that Tsunade trains Naruto more intensively in medical ninjutsu. Since she's his grandmother, she might feel a stronger obligation to pass on her skills.
A possible plotline could be about family secrets. Tsunade might reveal some long - hidden family secrets to Naruto that change his perspective on his family and his place in the village. For example, she could tell him about a special kekkei genkai that runs in the family that he might inherit.
A plot could develop where Naruto and Tsunade try to keep the pregnancy a secret at first. As the pregnancy progresses, it becomes harder to hide. Naruto may start to train even harder to prove himself worthy of being a father and to protect his unborn child. Tsunade, on the other hand, might face challenges from the medical community as her pregnancy at her age could be considered high - risk. And there could be a rift in their relationship as they deal with the stress and the different ways they approach the situation.
Well, in this fanfic, Naruto could start to heal from his past neglect. Tsunade might introduce him to different aspects of the ninja world that he was previously unaware of. For example, she could take him on diplomatic missions to other villages, which would expand his understanding of international relations among ninja clans. In terms of his growth as a ninja, Tsunade could also help him master some of the more advanced medical ninjutsu. This would not only make him a more versatile shinobi but also give him a new skill set to rely on in combat. And of course, their relationship could also face challenges, like when Tsunade has to make difficult decisions regarding the village that might put Naruto in a tough position.
One possible plot development is that Tsunade could step up her efforts in uniting the other villages. Since Naruto was a symbol of hope and unity, his death might prompt Tsunade to work even harder to prevent further chaos among the ninja villages. She could initiate more diplomatic meetings and treaties to ensure peace in Naruto's memory.
Naruto could develop more maturity under Tsunade's influence. Tsunade, being an experienced and strong - willed character, can teach Naruto how to better control his emotions in difficult situations.
In a Naruto and Tsunade time travel fanfic, they might travel to a time when the Uchiha clan was at its peak. Naruto could try to prevent some of the tragedies that befell the clan later. Tsunade, with her strength and wisdom, could help in diplomatic efforts. For example, she could work with the clan leaders to improve relations between the Uchiha and the rest of the village. This would not only change the future for the Uchiha but also for Naruto's own life as he has a deep connection with Sasuke, an Uchiha. And Naruto could learn new jutsu from the powerful Uchiha of that time, further enhancing his own skills.
Well, it depends on the specific fanfic. There are a lot of fanfictions out there with different takes on the Naruto universe. Some might make Tsunade Naruto's grandmother to add a new layer of family - related drama or to explore the idea of how her leadership and medical skills could be related to Naruto in a more family - centric way. It can be a really creative way to re - imagine the relationships in the Naruto world.
One possible plot idea could be that Naruto has achieved some great power or status, and Tsunade, who is usually strong - willed, is in a situation where she has to be submissive to Naruto for the greater good of the village. For example, Naruto might have discovered a new threat and has a plan to deal with it, but Tsunade needs to follow his lead.
One possible plot line is that Naruto is injured badly and Tsunade has to use her medical skills to save him. During his recovery, they have deep conversations about life, dreams, and the future of the village. Another could be that Tsunade decides to train Naruto in a special jutsu that only she knows, which would enhance Naruto's abilities greatly.
One possible plot could be Naruto using his charm and determination. Maybe he starts by impressing Tsunade with his growth as a ninja. He could show her his new jutsus and how far he's come in his training. Then, he gradually starts to show his affection in a more personal way, like bringing her small gifts or helping her with her Hokage duties in a very dedicated manner.