Even though Mon - El leaves, their relationship can still develop. Kara could keep a journal for the baby, writing about her feelings for Mon - El. When Mon - El returns (if he does), he could read it and realize how much Kara truly loved him. Also, Kara might have dreams or visions of Mon - El during her pregnancy, which could show that their connection is still strong on an emotional level.
She might initially be heartbroken. Kara, being strong - willed, could focus on taking care of herself and the unborn child. She may turn to her friends at the DEO for support, like Alex, who would be there to help her through the difficult time both emotionally and physically.
He might leave to protect Kara and the unborn child. Maybe he discovers that there is some kind of danger following him that could put them in jeopardy, so he decides to sacrifice his time with them to keep them safe.
One popular Kara and Mon - El pregnant fanfiction might be 'A New Beginning'. It focuses on how they navigate their relationship while expecting a child. It shows Kara's struggle between her superhero duties and impending motherhood in a really interesting way.
You can try Archive of Our Own (AO3). It has a vast collection of fanfictions, and there are likely to be many about Kara and Mon - El being pregnant. Just use the search function and type in the relevant keywords.
In this fanfiction scenario, Kara being pregnant and Mon - El leaving could lead to a complex story. Maybe Mon - El leaves because he fears for Kara's safety due to her pregnancy and his past or some external threats. Kara is left heartbroken and pregnant. She may initially be in denial about Mon - El's departure, but then has to face reality. As she goes through the pregnancy, she could meet new people who help her, like other superheroes or just kind - hearted civilians. And throughout the story, there could be a lingering hope that Mon - El will return, but also a growing sense of self - reliance in Kara as she prepares to be a mother alone.
Love is a very common theme. Since their relationship is a central part of the stories, it often explores different aspects of love like first love, unrequited love, or love that overcomes obstacles.
They would become more united. Having a baby together would make them a family, and they would have a stronger bond as they face the challenges of raising a child. Their relationship would be more about teamwork, not just as superheroes but also as parents.
One popular story could be 'Kara and Mon - El's New Beginning'. It might explore their relationship in a unique way, perhaps with some new challenges they face together in a different setting. Another could be 'Kara and Mon - El: Unlikely Allies' which might show them working together against an unexpected foe. And there could be 'Kara and Mon - El: A Love Rekindled' where they rediscover their feelings after a period of separation.
Fanfiction.net is also a good place. There are many writers who post their 'kara and mon el' related fanfictions there. Just make sure to use the right keywords in the search to narrow down to the ones with their kiss.