Maybe they time travel to a future where the White Walkers have won. They then have to figure out how to go back in time again to change the past and prevent this apocalyptic future. Along the way, they might discover new things about each other and their powers. For example, Sansa could have some latent magic ability that only shows up in this time - travel situation, and Jon could have a deeper connection to the ancient magic of the North that helps them in their quest.
One idea could be that they travel back to the time before their family was torn apart. They could try to prevent certain events from happening, like Ned Stark's execution. This would completely change the course of the story and their relationship would be very different as they work together to save their family.
One idea could be that Jon and Sansa travel back to the time before their family's downfall. They could then use their knowledge of future events to prevent Ned Stark's execution. This would completely change the course of the story and they might be able to save many of their family members.
One plot idea could be that Jon and Sansa travel back to the time before their family's downfall. They could use their knowledge of future events to prevent Ned Stark's execution. For example, they might be able to expose Littlefinger's schemes earlier. Another idea is that they travel to a future time where the White Walkers have been defeated, but they find new threats emerging and have to figure out how to deal with them. They could also travel to different kingdoms in different eras and learn about different cultures and forms of governance, which could then help them better rule Winterfell and the North.
One idea could be Sansa traveling back to the very beginning of the series and using her knowledge to prevent Ned Stark's death. She could subtly manipulate events, like warning her father about Littlefinger's true nature. Another could be her going back to the time of the Mad King and trying to find a way to end his reign more peacefully, which would change the entire future of Westeros. Or perhaps she travels to a time during the War of the Five Kings and allies with different houses in a new way to secure the North's future.
One plot idea could be Kagome accidentally traveling to the world of 'Game of Thrones' during a time when Jon Snow is in a great struggle. She could use her spiritual powers from her own world to help him sense approaching danger, like the White Walkers. For example, she might be able to detect their movements in a way that no one in Westeros can.
One idea could be that they travel back to the time when the Targaryen dynasty was at its peak. Jon could see Daenerys in her element as a Targaryen princess. They might try to change some of the events that led to the downfall of the Targaryens, like preventing the Mad King's actions. But this could have unforeseen consequences for the future they came from.
One plot idea could be their journey to discover a long - lost Stark family secret. This could involve them traveling to an ancient and mysterious location in the North. Another is them facing a new and powerful enemy that threatens the North and they have to combine their skills to defeat it.
A common plot is that Jon and Sansa travel back in time to change the events that led to the downfall of their family. They use their knowledge of the future to try and prevent tragedies. For example, they might stop Ned Stark's execution. Another popular plot is that they travel to a different time period in Westeros' history and get involved in the events there, like during the time of Aegon the Conqueror.
A plot could involve a scenario where Jon, after being revealed as a Targaryen, has to deal with Cersei in a different light. Cersei might see him as both a threat and a potential ally. They could be forced into a situation where they have to rely on each other's strengths, like Jon's military leadership and Cersei's political cunning, which then leads to a complex relationship.
A plot could involve Sansa being captured by the Night King. Instead of fearing him, she tries to communicate with him. She realizes that the Night King was once a man wronged by the world of the living. Together, they form an unlikely alliance against a greater threat that is emerging in Westeros, something that endangers both the living and the dead. This would turn the traditional view of their relationship on its head.
One idea could be that the OC is a healer from a far - off land who comes to Winterfell. Sansa is initially suspicious but as she sees the OC's kind heart and skills in treating the wounded, she warms up. The OC could also have some secrets about a possible threat coming to the North that they share with Sansa, and together they start to prepare for it.