One plot idea could be Naruko and Sakura going on a mission together in a new and dangerous area, and they have to rely on each other's unique skills to survive. Another could be them having to deal with a misunderstanding within the village that threatens their friendship.
A really interesting plot could be that Naruko discovers a new chakra - related ability and Sakura helps her to master it. In the process, they learn more about each other's insecurities and dreams. Or perhaps they travel back in time to when they first met and try to change the way they initially interacted.
A great plot idea could be that Naruko and Sakura discover a hidden power within themselves while exploring an ancient ruin. As they try to figure out how to control this new power, they rely on each other's strengths. Maybe there's a story where they get magically swapped in bodies and have to live each other's lives for a while. This would lead to a lot of humorous and also character - building moments as they understand what the other goes through. There could also be a plot where they are the only ones who can save their village from a mysterious and powerful enemy.
Well, a possible plot for Naruko and Kyuubi fanfiction is that the Kyuubi's power starts to merge with Naruko in a way that gives her new and unexpected abilities. She could then use these abilities to change the way the ninja world views her. Maybe she becomes a symbol of hope for those with tailed beasts within them. Another plot could be that Naruko has to enter the Kyuubi's mindscape to help it heal from some old wounds. In doing so, she learns about the Kyuubi's past and how it came to be so feared. And finally, they could go on a journey together to find a lost artifact that has the power to either free the Kyuubi completely or bind it more tightly to Naruko, depending on how they choose to use it.
Maybe a plot where Naruko comes from a different village and she and Naruto have to deal with the cultural differences in their family. For example, how they raise their children with different values from two different places. They might face some opposition from their respective villages at first, but they work through it for the sake of their family.
One idea could be that Sasuke and Naruko are on a mission together when they find out about the pregnancy. This unexpected news forces them to re - evaluate their ninja lives and how they will protect their future family while still fulfilling their duties to the village.
One idea could be a story where Naruto, Naruko, and Menma have to team up to face a new and powerful enemy that threatens the Hidden Leaf Village. They might have to combine their unique skills and overcome their personal differences to succeed.
One idea could be that the baby has some unique powers inherited from both Naruko and Sasuke. For example, the ability to control both fire and wind in a new and unexpected way. This could lead to various adventures as they try to protect the baby from those who might want to use its power for evil.
In some fanfictions, they could meet during a time - travel incident. Naruto from the present meets Naruko from the past or vice versa. They then exchange knowledge about the future or past events, which changes the course of their own timelines. This could lead to some really interesting character development as they both try to adapt to the new information and how it affects their relationships with their friends and family.
A plot could revolve around the clones being sent on a special mission. Since they are clones, they might not have all the emotional baggage of the originals. They could approach the mission with a fresh perspective and use their combined skills in new and unexpected ways. Maybe they have to infiltrate an enemy base, and their ability to think like Naruto and Naruko but also act independently gives them an edge.
One idea could be that Dark Naruto has to face his inner demons while Naruko tries to save him. Maybe there's a villain who is trying to manipulate Dark Naruto's power for evil purposes and Naruko discovers this and has to fight both the villain and convince Dark Naruto to resist the dark influence.
One idea could be a new character arrives at the school who has a unique power that disrupts the existing power balance among the student groups. Another could be a time - travel plot where a character goes back in time to change an important event in the Highschool DxD universe. Maybe a crossover with another popular anime, where characters from both shows interact in the Naruko Highschool DxD setting.