One common theme is the adjustment to their new roles. Clint and Natasha are used to being agents, and now they have to adapt to impending parenthood.
One common theme is loyalty. Their loyalty to each other is often explored, whether it's facing danger within the Avengers or from external threats. They always have each other's backs.
Love and friendship are also very common themes. Their relationship is complex, and fanfictions like to play with the idea of whether it's more of a romantic love or a deep friendship. And there's the theme of redemption. Both characters have pasts they might want to redeem themselves from, and this can be a strong part of the story.
One common theme is loyalty. They are both loyal to each other and to the Avengers. In many fanfictions, this loyalty is tested and it makes for some great drama.
Trust is a big theme. Their relationship is built on trust in fanfic, and many stories revolve around how they maintain that trust even in difficult situations. Also, the theme of sacrifice often comes up, as they are both willing to sacrifice for each other.
One common theme is loyalty. Their loyalty to each other, whether in the face of danger or difficult decisions, is often explored. For example, in many fanfics, they will stand by each other no matter what the cost.
One common theme is trust. Given their dangerous line of work, they have to trust each other completely. Fanfictions often explore how this trust develops and deepens over time. For example, in many stories, they start off as just colleagues who gradually learn to rely on one another in life - threatening situations.
One idea could be a story where Clint and Natasha are forced to go into hiding during their pregnancy because of some threat from their past enemies. They have to rely on each other more than ever, learning new things about their relationship as they prepare for the arrival of their baby.
One common theme is the fear of the unknown. Since they are both superheroes, they're not used to dealing with normal life events like pregnancy. Another theme is the support they give each other. For example, Tony might use his resources to ensure Natasha has the best medical care during pregnancy.
In these fanfictions, a common theme is the relationship between Natasha and the father of the baby (if it's specified). Whether it's a fellow Avenger or an original character, their relationship is often central. Another theme is the challenges Natasha faces in a world full of danger as a pregnant woman. How does she continue to be a part of the Avengers' missions? And the theme of hope is also there. The baby represents a new beginning, a hope for a different future for Natasha and the team.
The theme of family and new beginnings is also prevalent. Bucky and Natasha, who have both had difficult and often tragic pasts, see the pregnancy as a chance to start a real family. They might struggle with their own insecurities about being good parents due to their pasts, but they also find strength in each other and the idea of building a family together. This can lead to a lot of emotional and heartwarming moments in the fanfiction.