Perhaps a plot where their kiss is part of a prophecy. After they kiss, they discover that they are fated to save the entire Once Upon a Time universe together. But there are forces that don't want them to fulfill the prophecy. So they have to fight against these forces, all while exploring their new - found relationship. Along the way, they learn more about each other's pasts and how their destinies are intertwined, which makes their relationship even deeper.
A good plot could be set in an alternate universe where Emma and Hook's first kiss has different consequences. For example, instead of it leading to a happy relationship right away, it causes a rift in the fairy - tale world, and they have to work together to fix it while dealing with their growing feelings for each other. This could involve adventures across different realms and facing old enemies. It would be full of action, drama, and of course, romance.
One idea could be that they kiss during a moment of extreme danger, when they think they might not survive. It adds a sense of urgency and passion to the kiss. For example, they are facing a powerful enemy and right before a final showdown, they share a kiss as a way of expressing their hidden feelings.
A plot idea could be that Emma has prophetic dreams about the baby's future during her pregnancy. These dreams might show the baby having a great and important role in the magical world. Hook then becomes determined to make sure the baby can fulfill this role safely. Another idea is that a dark force tries to possess the unborn baby, and Hook and Emma have to find a way to prevent it, maybe by seeking help from Regina who has experience with dark magic.
A plot could involve Emma having difficulties with her pregnancy due to her being the Savior and all the magic in her. Hook is overprotective and tries to find ways to ease her pain. Meanwhile, they learn that there are prophecies about their child that lead them on a journey to different realms to protect the baby's future.
One popular plot idea is a love triangle between Hook, Tinkerbell, and another character, often a main character from the show. This creates a lot of drama and tension.
Well, perhaps the fanfiction could focus on Hook's backstory related to the birth. Maybe he had some past experiences that make him extra cautious during Emma's pregnancy. For example, he might have witnessed a difficult birth in his pirate days that scarred him. So when it's Emma's turn, he's constantly on edge. The plot could then revolve around him coming to terms with his fears and being there for Emma as she gives birth.
You can try searching on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Once Upon a Time Emma and Hook Kiss' in the search bar and you'll likely find a bunch of relevant fanfictions.
One great Hook Emma fanfiction is 'A Pirate's Heart'. It beautifully captures the chemistry between them. The story takes them on an adventure where they have to face many challenges together, which deepens their relationship.
The 'hurt/comfort' trope is quite prevalent too. For example, when Hook gets injured and Emma takes care of him, or vice versa. It shows their deepening connection. Also, the 'time - travel' trope can be found, where they might go back in time and experience events that change their relationship in the present. This adds an interesting layer of complexity to their story.
Another common one is relationship - centric storylines. Writers often explore how Emma and Hook's relationship develops further, like dealing with misunderstandings or facing challenges together that strengthen their bond. It could be something as simple as a family member not approving of their relationship at first and how they overcome it.
One popular theme is the exploration of their relationship's development. It might start from a place of animosity and gradually shift to a romantic connection that leads to the kiss. For example, they could be rivals at first, but as they face common enemies or challenges, they realize their feelings for each other.