One key plot twist could be a revelation about their true family relations that's different from the original. Maybe Clary discovers she has a hidden power that Jace unknowingly has a connection to. Another could be that an enemy they thought was defeated in the original story resurfaces in a more powerful form in the fanfic.
A really interesting plot twist could be that the world of the City of Bones in the fanfic has a parallel dimension. Clary and Jace get trapped there, and in this dimension, their personalities are slightly different. They have to work together to find a way back, all while dealing with alternate versions of their friends and enemies. This could completely change their relationship and the way they view the world of the Shadowhunters.
One interesting plot idea could be Jace and Clary going on a secret mission within the City of Bones. They could discover a hidden chamber that holds the key to a long - forgotten Shadowhunter power. Another could be them facing a new and powerful demon that specifically targets their relationship, forcing them to rely on their bond more than ever.
Clary could develop by becoming more independent in the fanfic. Instead of always relying on Jace, she starts to take the lead in certain situations. Jace's character might develop in terms of his relationship with Clary. He could learn to trust her completely, which was a struggle for him in the original. This could lead to him being more at ease and less brooding around her.
Their relationship could develop through shared danger. For example, when they are in a fight against a horde of demons in the City of Bones, they rely on each other's skills. Jace's combat expertise and Clary's ability to see things others can't work in tandem, and this mutual dependence could bring them closer.
In a fanfiction, their kiss could be a turning point in their relationship. Maybe they had been denying their feelings for a long time, but this kiss shatters all the barriers. It could happen in a secret, magical place within the City of Bones. The setting would add to the allure of the moment. Clary might be the one to initiate the kiss, surprising Jace, and from that moment on, their relationship takes a new direction, filled with more love and understanding.
Perhaps they would encounter fanfiction that gives more backstory to their characters. In the City of Bones, there are a lot of mysteries about their pasts. Fanfiction writers might have come up with some really interesting theories and stories about their origins. Clary and Jace could gain new insights into their own identities by reading these fan - created stories. It could also be a way for them to connect more deeply with the fan community that loves their story so much.
They could start by looking at some well - known fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfiction for various fandoms, including the City of Bones. There are likely to be many high - quality stories there, sorted by different categories such as genre, rating, and relationship focus.
One scenario could be that their kiss is a moment of realization. In the midst of all the chaos in the City of Bones, their kiss is like a sudden burst of clarity. They've been through so much together, and this kiss is the culmination of all the unspoken feelings. It could be a very passionate kiss, filled with all the pent - up emotions from their adventures and the danger they've faced.
One plot twist could be that one of them loses their memory. For example, Jace might lose his memories of Clary and their relationship, and Clary has to work hard to make him fall in love with her all over again. Another twist could be that there's a hidden prophecy that says their love will bring destruction, so they have to figure out a way to be together without causing chaos. Or maybe a new character shows up who claims to be Jace's long - lost sibling and tries to break them up.
The kiss could also be a part of a rescue mission. Jace is in danger, and Clary uses the power of their love, expressed through a kiss, to save him. She kisses him, and somehow, her love transfers energy or a healing power to him. This could show the depth of their bond and how their relationship is not just about romance but also about being there for each other in the most difficult situations.
In this fanfic, the pregnancy could be a sign of hope for the Shadowhunter community. Clary and Jace, being two important figures, are now having a child. Their journey could involve seeking ancient knowledge from the Silent Brothers or the Iron Sisters about how to ensure the health of the baby, considering their unique genetic makeup as Shadowhunters. Along the way, they could strengthen their relationship even more as they face the challenges together.