One interesting Spencer and Caleb fanfiction could be about them going on a secret adventure together. Maybe they discover a hidden part of Rosewood that holds a mystery related to their families. They could rely on each other's unique skills, Spencer's intelligence and Caleb's tech - savvy, to unravel the secrets.
Well, a great plot could be that Caleb finds a strange encrypted file on his computer that seems to lead to a hidden treasure in Rosewood. As he tries to decipher it, he has to team up with some unexpected characters from the show. Maybe he also has a vision or a strange dream that leads him to believe there's something supernatural going on in the town related to the file. Also, he could get into a situation where he has to choose between his loyalty to his friends and his own personal gain from the treasure.
Another reason is that they both have had their own share of troubles in the show. By pairing them in fanfiction, it gives the writers a chance to show how they can heal each other. Spencer, with her family problems, and Caleb, with his past in foster care, can find solace and love in each other. This aspect of two damaged souls coming together is very appealing to many fans who write and read fanfiction about them.
One interesting plotline could be Caleb and Hanna facing a new mystery together in a post - show fanfiction. Maybe they move to a new town and start to notice strange things happening around them, just like in the original show.
A possible plotline is that Toby and Spencer get married in a secret ceremony. But then they face challenges when the truth about their marriage gets out. The other Liars might have mixed reactions, some being happy for them while others worried about how this will affect the group dynamic and their safety from the ever - lurking A.
A possible plotline is that Dean has a connection to one of the 'A' characters from his past that he doesn't remember at first. Spencer helps him dig into his past and they find out that his family has some sort of history with the chaos in Rosewood, which puts both of them in danger but also brings them closer together.
In some fanfiction, there are storylines where Emily and Spencer are in a parallel universe. In this universe, they are the only ones who remember the events of the original Pretty Little Liars world. They have to figure out how to get back to their own world while also facing different versions of their friends and enemies. It's a really exciting concept that allows for a lot of creativity in exploring their characters.
One possible storyline could be Spencer and Andrew teaming up to solve a mystery in Rosewood that the other Liars are oblivious to. They could use their combined intelligence to piece together clues.
One interesting storyline could be their future together. Maybe they move away from Rosewood and start a new life, away from all the drama. They could be building a house and planning their wedding at the same time.
One interesting storyline could be them solving a mystery together that is separate from the main 'A' plot in the show. They use their combined intelligence and Toby's skills to uncover something that has been hidden in Rosewood for years.
One great fanfiction could be about Caleb and Hanna's future together. Maybe they move to a big city and start their own tech business while also dealing with the occasional drama from their past in Rosewood. Another could be a story that takes place during a time skip, where they reunite after being apart for a while and have to rekindle their relationship.