There could be a story where the daughter has some kind of medical condition that causes lap pain. Her dad, on noticing her discomfort, would be worried sick. He would likely do all he could to ease her pain, from getting her painkillers if appropriate to arranging for proper medical tests to find the root cause of the pain.
I'm not sure which is the absolute best, but 'Naruto and the Spectacle of Pain's Battle' is another one that stands out. It has some unique interpretations of the fight, like how Naruto analyzes Pain's techniques in real - time and how that affects his own future battles. The writing style is engaging and it keeps you hooked from start to finish.
One great fanfiction could be 'Naruto's Ascent Against Pain'. It really delves into Naruto's mindset during the fight and adds some unique jutsu concepts. Another is 'Beyond the Pain Battle', which focuses on the after - effects of the fight on the village and Naruto's relationships. There's also 'Naruto vs Pain: The Alternate Path' that takes a different turn in the fight's progression.
You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide range of Naruto fanfictions, and you might be able to find one about Naruto watching the fight with Pain there.
One possible plot development could be Naruto focusing on rebuilding Konoha. He might use his newfound influence and power to inspire the villagers and make Konoha stronger than ever. Maybe he starts new training programs for the ninja of the village to better prepare them for future threats.
By delving into her past traumas. Maybe she had a difficult childhood that resurfaces when she faces a similar situation in the show's setting. This could be something like growing up in a family with high expectations and constantly feeling like she's not good enough. When she fails at a big case, these old feelings of inadequacy come back and cause her great pain.
Well, FanFiction.net is a great place to start. There are thousands of Naruto fanfictions there. Just type in 'Naruto fight Pain' in the search box and you'll get a bunch of results. Another option is Archive of Our Own. It has a more organized tagging system, so you can find relevant fanfictions more precisely. Some Naruto - focused forums might also have links to such fanfictions shared by fans.
Well, Naruto himself might be really focused on Pain's motives in the fanfiction fight. Since he always tries to understand his opponents. Sasuke could be analyzing Pain's jutsu and thinking about how it compares to his own power. And Sakura might be worried about the destruction caused, just like she was in the original story when Pain attacked the village.
The biggest difference is the creativity of the fanfiction writers. In the anime, the fight follows a set storyline. But in fanfiction, anything can happen. For example, Naruto could suddenly gain a new power that was never in the anime. It's like a whole new world of possibilities.