One plot idea could be that Captain Hook and Emma Swan find themselves in a race against time in Neverland. They have to retrieve a magical artifact before a dark force uses it to destroy all the realms. Along the way, they face challenges from the Lost Boys and some of Hook's old enemies.
Perhaps they go to Neverland in search of a way to reverse a curse that has befallen Storybrooke. In Neverland, they discover that Hook's past is somehow intertwined with the solution. They have to explore his memories and face his old self, the more villainous version of him, while also dealing with the perils of the island.
One idea could be exploring the backstories of the lost boys in more detail. Maybe one of them has a hidden connection to a character from the outside world. Another plot could involve a new villain coming to Neverland who has a different kind of magic that challenges Peter Pan. Also, a story about Wendy's granddaughter returning to Neverland to find a lost family heirloom could be interesting.
Well, they could start by relying on each other's skills. Hook's knowledge of Neverland and his sailing expertise, combined with Emma's magic, would make them a formidable team. As they face danger together, like escaping from a giant sea creature or finding a way through a maze in the jungle, they start to trust each other more, which deepens their relationship.
One idea could be exploring the origin of the Dark Swan's powers in more depth. Maybe she discovers an ancient magic that was long forgotten. Another plot could involve her forming an unlikely alliance with a character who was once her enemy to fight a greater evil that threatens their world.
Well, a cool plot might involve the Red Swan Queen being exiled from her own land unjustly. She then has to find a way to prove her innocence while also dealing with the challenges of the outside world. She could meet a group of misfits who help her on her journey. Maybe she also discovers a secret about her family's past that changes everything she thought she knew. She could then use this new knowledge to regain her throne and bring about a new era of peace in her kingdom.
Another fan - favorite is 'Our Ever After'. This one delves deep into their relationship, exploring their past traumas and how they overcome them together. It has some really emotional scenes that add a lot of depth to the story. The writing style is also very engaging, making it a must - read for any Captain Swan fan.
Perhaps they are in the middle of a new adventure when Emma realizes she's pregnant. This could add a whole new layer of tension as they not only have to deal with the external threats but also ensure the safety of the baby. They could seek help from their friends in Storybrooke, who have mixed reactions to the news.
Archive of Our Own (AO3) is a great place to start. It has a vast collection of Captain Swan fanfiction, ranging from short one - shots to long, multi - chapter stories. You can easily search for what you're interested in using the tags.
Another common trope is the 'Time Travel' trope. Given the magical nature of the 'Once Upon a Time' universe, it's not surprising that many fanfictions use time travel as a plot device. For example, Emma or Hook might travel back in time to change an event that affects their relationship, or they could be sent to the future and have to deal with the consequences of what they see there in relation to their love for each other.
One idea could be a crossover where characters from 'half upon a time' meet characters from another well - known fairy - tale world. This could lead to some really unique and humorous interactions as they try to navigate each other's rules and cultures.
One idea could be exploring what would happen if the kids found a secret passage in the orphanage that led to a different world, one not controlled by demons. Another could be a story where Emma and Ray make an alliance with a friendly demon who helps them rescue all the children at once. Maybe a fanfiction where they discover a way to reverse the demon's need for human flesh through some ancient magic.