Yes, there are. Fanfiction writers have explored this concept. But the quality and style of these stories can vary greatly. You could try using specific search terms and filters on fanfiction platforms to narrow down your search.
In fanfiction, it often starts with their shared adventures. They face various threats and challenges together, which brings them closer. For example, in some stories, they have to save a planet from destruction, and during that time, they realize their feelings for each other.
The kiss can strengthen their relationship immediately. It can break down the barriers of unspoken feelings and make them more open and honest with each other. They might start to rely on each other more in a different way than before, like having a deeper emotional support.
One interesting plot could be that the kiss is a moment of realization for both Clara and the Doctor. It might be the moment when they finally admit their hidden feelings that have been building up throughout their adventures. For example, they could be in a dangerous situation, and the kiss gives them the strength to face the danger together.
It varies! Sometimes Clara is held for ransom, and the Doctor has to negotiate. Other times, it's part of a larger conspiracy and Clara's kidnapping is just the tip of the iceberg.
It could be all sorts of things. Maybe Clara has to protect the baby from some alien threat or it could be a story about her raising a time-traveling baby.
The pregnant fanfiction about Clara in Doctor Who can range from heartwarming family-centered stories to complex plots involving time travel and the consequences of her pregnancy on the show's universe. It really depends on the creativity of the fans!
It could be for creating drama and tension in the story. Maybe it adds a new layer to their relationship or drives the plot forward in an unexpected way.