You could write a fan - fic about their adventures together. For example, they could be on a quest to save their city or world. This would focus on their heroism and teamwork.
One common theme is family building. It shows how Lena and Kara come together to create a family unit with the baby. Another theme is the exploration of their relationship. Having a baby often tests and deepens their bond.
One possible plot could be that Lena and Kara are in a dangerous situation together. As they face a powerful enemy, they realize their deep feelings for each other. In a moment of intense emotion, perhaps after one saves the other's life, they share a kiss.
You can start by looking on fanfiction.net. It has a large collection of fan - made stories, including many Kara Lena ones. Just use the search bar and type in 'Kara Lena' and you'll get a bunch of results.
One great Kara Lena fanfic could be 'The Bond Beyond Powers'. It delves into how Kara and Lena's friendship blossoms into something more in a world full of challenges. They face villains together and in the process, their relationship deepens on an emotional level.
One possible fanfiction could be about Lena Luthor becoming a mentor to young Kara Danvers. Lena, with her intelligence and resources, could help Kara understand the complex world around her while also learning to control her powers better. Maybe Lena discovers Kara's identity early on and decides to guide her in secret, away from the prying eyes of Lex Luthor and other potential threats.
Well, one common theme could be the power dynamics between the alpha and omega characters. In this case, how Kara and Lena interact within that framework. Another might be themes of loyalty and friendship that develop in the context of their different roles.
One idea could be that they overcome some external threat together which makes them realize their love is unbreakable and they decide to get married. Maybe they fight against an anti - alien group that targets Kara, and Lena uses her intelligence and resources to protect her. This shared experience brings them closer than ever.