Some fanfictions also focus on the magical elements in their relationship. Maybe the kiss has some sort of magical consequence, like unlocking a new power or breaking a curse. It ties in with the magical nature of the show and gives a unique spin to their relationship.
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.
One popular trope is 'enemies to lovers'. Since Emma and Regina started off as adversaries in the show, this trope is quite common in their fanfictions. Another is 'soulmates'. Fans like to explore the idea that they are meant to be together in a more fated way.
Redemption is a very popular theme. Given Regina's complex character arc in the show, many fanfictions explore her journey towards redemption, how she tries to make up for her past wrongs and find a place in the world where she can be accepted and at peace.
Power and its use is another theme. Emma's light magic and Regina's dark magic can be a source of conflict or cooperation. Some fanfictions might show them learning to combine their powers in a balanced way to protect their town and the people they care about.
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.
One popular storyline is about Ruby, Regina and Emma teaming up to fight a new, powerful villain in Storybrooke. They combine their different powers and skills to save the town.
One popular trope is the 'enemies to lovers' scenario. Regina and Emma start off on the wrong foot, with their differences and past conflicts, but gradually fall in love. Another is the 'soulmate' trope, where they are fated to be together in some magical or destined way.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms usually have a large collection of fanfictions on various topics, including stories about Emma and Regina from Once Upon a Time that might include a kiss scene.
You can try looking on fanfiction websites like Archive of Our Own (AO3). There are a large number of fanfictions there, and you can use the search function to specifically look for stories about Regina and Emma kissing. Another option is Fanfiction.net, although the interface and tagging system might be a bit different.
One popular theme is their love story. Writers often explore different aspects of how Emma and Charming fell in love and how they maintain their relationship. Another theme is their adventures together, like going on quests or fighting villains.
Maybe Emma is actually from an alternate timeline where Regina was the one who sent her to our world for a greater purpose. As the story unfolds, this revelation makes Regina question her own motives and actions towards Emma throughout their time together.