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.
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.
One interesting plot idea could be that Naruko discovers the female Kyuubi has a unique power that can help her in a difficult battle against a powerful enemy. For example, the female Kyuubi might be able to sense the enemy's weaknesses and communicate them to Naruko telepathically.
One idea could be that Naruto and Naruko, as twins, have a unique bond that allows them to share chakra in a special way. This could help them in battles, like when facing a powerful enemy together.
Perhaps the baby has an unexpected connection to an ancient prophecy. Sasuke and Naruko then have to figure out what this means for their family and the Hidden Leaf Village. They might also face challenges from within the village as some people are suspicious of the baby's power.