Another plot could be a time - travel fanfiction. Annalise somehow gets sent back in time and Eve has to find a way to bring her back. In the past, Annalise meets younger versions of people they both know in the present. She has to be careful not to change the future while also trying to find a way back. Eve, on the other hand, is researching in the present, looking through old books and consulting with some eccentric scientists to figure out how to reverse the time - travel.
One idea could be that Annalise and Eve team up to solve a mystery in their small town. Maybe there's a series of strange disappearances that the authorities can't seem to figure out. They start by interviewing the locals, gathering clues from different places like the old library or the abandoned factory on the outskirts. As they work together, they discover secrets about each other and their own pasts that they didn't expect.
A more relationship - focused plot could be that Annalise and Eve are in a love triangle with a third character. This third character is charming and seems to be interested in both of them. Annalise and Eve start to have some misunderstandings and a bit of jealousy. But in the end, they realize that their friendship is more important than any romantic interest from this third person and they work things out together.