Well, one possible plot could be Naruto coming back to the village and being hailed as a hero. He might then focus on rebuilding the parts of the village that were damaged during the Pain attack. He could also start training the next generation of ninja, sharing his newfound wisdom and strength.
A great plot for this fanfic could be Naruto's internal struggle after defeating Pain. Despite the victory, he might be haunted by the destruction and loss he witnessed. So, when he returns, instead of just celebrating, he could be more focused on making sure such a thing never happens again. He could start by implementing new defense strategies for the village. He might also try to understand Pain's motives more deeply to prevent future threats that are born out of similar pain and suffering. He could then travel to different places to spread his message of peace and understanding, which would also show his growth as a character.
It could be a rogue ninja from another village who sees Naruto's victory as a threat to their own plans. Maybe they were planning some sort of takeover or power play and Naruto's new - found status throws a wrench in their plans.
In this kind of fanfiction, Naruto might be welcomed as a hero. The village could start to rebuild with his leadership. People would look at him with newfound respect and admiration.
He could meet Hinata, and their relationship might develop further. Maybe she would be the first to greet him and express her admiration more openly.
Often, Naruto's relationships with other characters are explored further. He might have deeper conversations with Sasuke, trying to convince him to come back to the village for good. His bond with Sakura could also develop in different ways, perhaps becoming a stronger friendship or even something more romantic in some fanfictions.
One possible plot could be Naruto and Ino working together to help rebuild the village after Pain's attack. They might bond over their shared experiences and grow closer as friends or even develop romantic feelings. They could also be involved in training the new generation of shinobi to prevent future attacks.
Another development could be that Naruto starts to understand the world outside the Hidden Leaf better. His encounter with Pain, who had his own ideology about peace, makes Naruto question his own views. So, he might embark on journeys to other villages to learn more about different cultures and ways of achieving peace, which in turn changes his perspective on many things.
One possible plot could be that the village, still shaken by Pain's attack, blames Naruto for not preventing all the destruction. They think he has some hidden connection to Pain and turn on him. Naruto, heartbroken, decides to leave the village and find out the truth about his past and the Akatsuki on his own.
One possible plot could be that Hinata and Naruto start to train together more intensively. After facing Pain, Naruto realizes Hinata's feelings for him more deeply. They could go on missions side by side, and Hinata becomes stronger under Naruto's influence. Naruto, in turn, starts to see Hinata as not just a friend but someone he could potentially have a future with.
Well, it could be about Naruto's kids facing a new threat that was somehow related to the past. Maybe an old enemy's apprentice has come back to seek revenge for their master's defeat decades ago.
It could symbolize a new chapter in their relationship. Before, Naruto was mostly focused on his goals and being recognized in the village. But after facing Pain, he might have a new perspective on life and love. The kiss with Hinata could be the start of a deeper, more romantic connection, showing that he's ready to explore his feelings for her and let someone be close to him in a different way.