Well, it could be that they meet and reflect on their past lives. Maybe they realize the mistakes they made while alive and try to find a way to make amends in the afterlife.
It could be a malevolent spirit who is jealous of their friendship. This spirit might try to drive them apart in the afterlife by causing misunderstandings between them.
One possibility is that in the afterlife, Snape finally finds peace. He no longer has to hide his true loyalties or endure the scorn of those who misjudged him. He might be reunited with Lily, and they could have the conversations they never had in life. He could also meet with Dumbledore again, and they could discuss all the secrets and sacrifices that were made during the war.
Well, perhaps Scar finally has to face Mufasa and atone for his sins. He might be filled with guilt and seek forgiveness from Mufasa in the afterlife. Mufasa, being the noble lion he was, could either forgive Scar or make him understand the full extent of his wrongdoings.
The plot could involve Dom being there for Brian during the pregnancy. He might help with doctor's appointments, getting things ready for the baby like setting up the nursery. For example, Dom could use his mechanical skills to build the crib. And he'd be a source of emotional support, especially if Brian is feeling nervous or stressed about becoming a father.
In some 'dom and letty meet fanfiction', they could meet in a parallel universe where their personalities are slightly different. Dom might be more hesitant and Letty more impulsive. This change in their characters could lead to a whole new dynamic in their relationship, and they would have to figure out how to deal with each other and the new threats in this strange world.
It could be developed by exploring their past. Maybe they start to talk about their childhood memories that they haven't shared before. This kind of deep conversation can make them understand each other better and bring them closer. Another way is through facing a common enemy. They have to protect each other and in the process, their feelings for each other grow stronger. They learn to trust each other more and become more than just friends or partners, but truly soulmates.
In this fanfiction, it could be that the future has a new Dark Lord. The Marauders are brought forward in time to stop this new threat. They face challenges like understanding the new forms of magic and technology that the future Dark Lord has harnessed. They also have to deal with the fact that the future wizarding world has different social and political structures. They might start by infiltrating the Dark Lord's lair using their Marauder's Map - like skills, but find that the map doesn't work as well in the future, leading to all sorts of interesting and dangerous situations.
Well, it could be about Chowder and Mung going on a wild adventure in a magical food land. Maybe they discover a new recipe together that has some sort of magical powers.
Well, the plot could be about Spyro being lost in a human world and a human fan of his discovers him. The human could then help Spyro find his way back home while they have adventures together, like facing some bad guys who also ended up in the human world from Spyro's realm.
One possible plot could be that Sleipnir, the eight - legged horse from Norse mythology, somehow ends up in the Marvel universe. The Avengers initially mistake it for a threat. But then they discover that Sleipnir is being chased by some dark Norse entities. The Avengers decide to protect Sleipnir and in the process, they learn about Norse magic and mythology, and how it can be both a help and a hindrance in their own universe.