It could be a story that focuses on the relationship between Kara and Alex in this new setting. Perhaps on Earth 39, their bond is tested in ways it hasn't been before. They could be separated and have to find their way back to each other while dealing with various obstacles. It might also explore how they adapt to the different culture and rules on Earth 39.
Well, the plot could be that Kara gets injured during a fight. Alex, with her medical knowledge, tends to Kara's physical wounds while Maggie uses her detective skills to figure out who was behind the attack that hurt Kara. They might also have some sisterly and couple moments as they take care of Kara, like cooking her favorite food and keeping her company while she recovers.
One possible fanfic could focus on how they support each other through their PTSD episodes. Alex, with her military background, might have PTSD from combat situations. Kara, having lost her planet and family, also has her own traumas. They could share their nightmares and fears, and use their superpowers in non - physical ways to comfort each other, like Kara using her heat vision to create a warm and calming environment when Alex is having a flashback.
Perhaps the story could revolve around a threat to the city where they live. Alex, with her military and combat expertise, and Lena, with her technological genius, work together to protect the city. Kara, seeing her moms in action, is inspired to use her powers for good. However, she also has to deal with the normal teenage problems like making friends and getting good grades at school, all while having two amazing moms by her side.
One possible plot twist could be that on Earth 39, Alex has some latent superpower that she discovers. This would completely change the dynamic between her and Kara, as now they both have super - abilities. Another twist could be that the version of Kara on Earth 39 is actually an evil doppelganger, and the real Kara has to convince Alex that she is the true one.
One key element could be the origin of their PTSD. For example, it could be from a major battle against a powerful villain where they both faced near - death experiences or witnessed the death of someone close. Another element would be their different ways of coping. Kara, with her superpowers, might feel an added pressure to always be in control and protect everyone, so when she fails, it hits her hard. Alex, as a human in a world of super - beings, might have a sense of inferiority that gets exacerbated by the PTSD. The third element could be their support system. Their friends at the DEO and family members like Eliza could play important roles in their recovery.
One possible fanfic could focus on a mission gone wrong that leads to both Alex and Kara experiencing PTSD. In the story, they might initially try to hide their symptoms from each other. Kara could be having nightmares about not being able to save the people she loves during the mission, while Alex might be jumpy and overly vigilant. As the story progresses, they finally open up to each other and start to heal together, perhaps through some shared training sessions that also double as therapy, where they learn to trust themselves and each other again.
One possible plot could be that on Earth X, Sara Lance and Alex Danvers are forced to team up against a common enemy. Maybe a powerful dictator has risen on Earth X and they are the only ones with the skills and courage to oppose. Sara's combat skills and time - traveling experiences combined with Alex's scientific knowledge and super strength could make for an interesting dynamic.
Well, perhaps the story could be about Alex and Maggie coming together to take on the role of Kara's mother figure in some really unexpected ways. Maybe they have to deal with Kara's superpowers and how to raise her in a world that doesn't fully understand her. It could also involve them protecting Kara from various threats while also teaching her important life lessons.
One possible plot could be that Alex and Kara are in a difficult situation, like facing a powerful enemy. Kara might feel pressured to protect everyone but starts to doubt her abilities. Alex, seeing Kara's struggle, tries to support her but also has her own fears. This internal and external pressure could lead to Kara's mental breakdown as she feels she's failing those she loves, and Alex has to find a way to bring Kara back from the brink.
One possible plotline could be that Alex and Kara initially struggle with the news of the unplanned pregnancy. They might face doubts about their relationship, their future, and how to handle the responsibilities. For example, Alex could be worried about her career and how having a child will impact it. Kara, on the other hand, might be concerned about her powers and whether she can keep the baby safe in a world full of threats.