One common theme is trust. Since both characters have had complex pasts, building trust between them is often explored. For example, in many fanfics, Bucky has to prove himself to Fury after his time as the Winter Soldier.
One popular Bucky Fury fanfic is 'The Unlikely Alliance'. It explores a unique scenario where Bucky and Fury have to team up against a common enemy. The story is full of action and great character interactions.
In this fanfic plot, Bucky's character development could be significant. His family's love and acceptance could give him the confidence to face his past traumas. He might start to heal from his inner wounds. For example, if he used to be withdrawn, he could become more social within the family. He could also learn to trust again, which is a big step for him considering his experiences. He'll be surrounded by people who care about him, and that positive environment will help shape him into a more positive and stable person.
Sharon Carter could be in the fanfic. She could be the one who provides some medical or scientific insights into what's happening to Bucky. Maybe she has some knowledge of the experimental substances that might be related to Bucky's growing belly and tries to use her resources to help him.
Maybe Sam had his own urgent matters to attend to and couldn't stay with Bucky. Or perhaps he thought Bucky would be better taken care of by the friend in that situation.
Well, it's quite possible that a 'bucky barnes sneeze fanfic' exists. Fanfic writers are known for their creativity and ability to come up with the most unexpected scenarios. Bucky Barnes is a popular character, and while a sneezing - based fanfic might seem strange, there are fanfics about all sorts of things. You could also try reaching out to Bucky Barnes fan communities on social media platforms like Tumblr or Reddit and ask if anyone has come across such a fanfic.
A fanfic about Bucky and Loki's friendship could show them on adventures together. Loki's trickery combined with Bucky's combat skills would make for an exciting duo. Their friendship might also develop through a series of heart - to - heart conversations. Bucky could share his struggles with Loki, like how hard it is for him to reintegrate into society. Loki, in turn, could open up about his feelings of being unloved in Asgard. Through these exchanges, a deep and meaningful friendship could form between them.
A 'bucky therapist fanfic' could be about Bucky, perhaps from the Marvel universe, having interactions with a therapist. It might explore his mental state, traumas, and the process of healing through his sessions with the therapist.
I'm not sure specifically what 'bucky sex fanfic' is, but if it involves sexual content in fanfiction, it may not be appropriate. Fanfiction should generally adhere to ethical and moral standards, and overly sexual or inappropriate content goes against the positive nature of fan creativity.
It's not common at all. Fanfic often gravitates towards themes that are more in line with the general tone and themes of the original source material. Since the concept of Bucky giving birth is so far - fetched and not something that is hinted at in the original context, it's likely to be a very rare type of fanfic. There are so many other more typical areas that fanfic writers explore, like character development, romantic relationships, and world - building, that this kind of extremely unique concept doesn't often surface.