Sometimes, Sam is written as being intrigued by the prostitute's life story. He may be drawn to her because she represents a part of the human world that he hasn't fully understood before. Through their interactions, Sam learns more about the harsh realities of life on the streets and how people cope in such difficult circumstances. This portrayal can add depth to Sam's character as he becomes more in - touch with the real - world problems outside of the supernatural realm.
In Supernatural fanfiction, Sam having cancer can be portrayed in various ways. Some authors might use it as a way to add more emotional depth to his character. They could show his struggle with the illness while still dealing with the supernatural threats. For example, he might be weaker physically but still determined to fight demons, which creates a contrast between his human vulnerability and his heroic side.
In fanfiction, the relationship between Sam in 'Supernatural' and a prostitute character can be used to explore various themes. It might show Sam's compassion as he could be depicted trying to help the prostitute out of her difficult situation, perhaps by getting her away from the dangerous life she's in.
In most Supernatural Sam fanfiction, bestiality is not a common or acceptable theme. The Supernatural universe generally focuses on human relationships, the fight against the supernatural, and the bond between the characters like Sam and his brother Dean. Fanfiction writers usually adhere to the ethical and moral boundaries of the show's overall tone, so bestiality would be highly out of place and not likely to be part of a legitimate story.
Often, mental regression is used as a tool to explore a character's past traumas. It might be that a character is forced to relive parts of their childhood in their mind, and this regression shows how those past events still influence them in the present within the supernatural world of the fanfiction. Maybe they start to act out old fears or insecurities that were long buried.
Often, the pregnancy is depicted in a way that ties into the overall themes of the Supernatural world. It could be part of a prophecy or some sort of dark magic. Maybe she was cursed with the pregnancy, and it's now a race against time to either get rid of it or use it to her advantage. Fanfic writers might show her dealing with the physical and emotional toll of pregnancy while still trying to maintain her status among demons.
The relationship between the archangels and the mom can also be a way to explore themes of family and loyalty. In some fanfics, the mom might be a powerful supernatural being herself, and her bond with the archangels is based on mutual respect and shared goals. This can create a complex dynamic where they work together against common enemies.
It's also possible that he gets injured while trying to save someone. Sam is known for his selfless nature. He could be rushing to protect an innocent bystander from a supernatural creature, like a werewolf or a vampire, and in the process, get bitten or scratched, which would lead to an injury.
Sam's baby sister could also be depicted as a mediator. In a story where there are conflicts between different groups of Transformers on Earth, her naivete and lack of prejudice could help bridge the gap. She doesn't understand the reasons for their fighting and just wants everyone to get along, which could gradually influence the Transformers to find common ground.
Physically, he could be shown with bruises, cuts, and broken bones. Writers might describe his pain in detail, like how he winces when he moves or how difficult it is for him to stand. This makes the reader empathize with his situation.
In fanfiction, if Sam was kidnapped, it could lead to a very intense story. Dean would surely go on a rampage to find him. Maybe Sam was kidnapped by a powerful demon who wants to use him for some dark ritual. It could also be a new, unknown enemy who has a vendetta against the Winchesters.