There could be a fanfic where Bella and Alice have to work together to save Edward from a powerful and ancient vampire who has a vendetta against him. This would put Bella and Alice in a situation where they have to rely on each other's unique skills and their growing friendship to succeed. Bella's human intuition and Alice's ability to foresee the future would be crucial in their plan to rescue Edward.
One plot idea could be that Bella discovers she has a special power that only Alice can understand and help her develop. This power could be related to seeing the future in a different way than Alice does, creating an interesting dynamic between them as they try to figure out how it works.
Perhaps they go on a journey to find out more about their relationship's origin. They might travel to different vampire clans around the world to seek answers, facing all kinds of adventures and challenges along the way, and in the process, their bond grows even stronger.
One interesting fanfiction could be about Bella and Alice going on a shopping spree together in a human - vampire friendly town. They could bond over choosing outfits and sharing fashion tips, which is quite different from the usual intense situations in the original series.
A plot could revolve around Carlisle and Bella going on a secret mission together. Maybe they have to find a lost ancient vampire artifact that could change the future of the vampire world. Along the way, they develop a deep bond and respect for each other.
A possible plot could be Bella and Alice going on a road trip together. During the trip, they encounter various challenges and also bond over shared experiences. They might come across other supernaturals and have to deal with them. Or perhaps Alice has a vision about Bella's life as a human being in danger in a specific location, and they go there to prevent it. Along the way, they learn more about each other's pasts and fears.
A unique concept could be a time - travel fanfiction where Alice takes Bella back in time to witness important events in the vampire history. This would allow Bella to gain a deeper understanding of the vampire world and her place in it.
One idea could be that Bella discovers her inner Ripper side when she is exposed to a powerful vampire's bloodlust-inducing power. She starts to struggle between her human morals and the new, dark desires.
One great 'Bella Swan Alice Cullen Fanfiction' is 'The Unforeseen Bond'. It explores a unique friendship between them that goes beyond the typical storylines. Another one is 'Alice's Vision for Bella', which focuses on how Alice's visions play a role in Bella's life in new and interesting ways. There's also 'Bella and Alice: A Different Path' where they take on challenges together that are not part of the original plot.
Another interesting one is 'Alice and Bella: A New Alliance'. In this fanfiction, Alice and Bella team up to solve a mystery in the vampire world that even the Cullens are not fully aware of. It shows their intelligence and determination.
One idea could be that Harry discovers a hidden portal that leads him to the Twilight world where he meets Alice Cullen. They then team up to fight a new dark force that is threatening both their worlds.
Perhaps they get trapped in a time - loop. In this scenario, they have to figure out how to break free while also dealing with their complex relationships. Each time they go through the loop, they learn something new about each other and themselves, which helps them in their overall mission to escape the time - loop.