The themes include loyalty. Sam and Dean are extremely loyal to each other, and fanfics play around with that loyalty in different situations. Another is the search for a normal life. Despite being hunters, they sometimes long for a normal existence, and this is often explored in fanfiction. Also, the theme of fate. Whether they can change their pre - determined destinies as hunters is a popular topic in Sam and Dean Winchester fanfiction.
Well, family is a huge theme. It's not just about Sam and Dean, but also their extended family and how that impacts their lives. Sacrifice is also common. They are always willing to put themselves in harm's way for each other or for the greater good. And then there's the theme of the unknown. Fanfiction often takes them into uncharted territories in the supernatural world, exploring things that the show might not have covered yet.
A sense of duty is present as well. Dean feels it's his duty to keep Sam safe. So when Sam is hurt, it's like he's failed in his mission. This leads to self - reflection in Dean and often a new determination to keep Sam out of harm's way in the future.
The theme of family legacy is quite prevalent. Since they come from a family of hunters, many fanfictions explore how this family history affects their actions and decisions. Also, the theme of growing up in a tough environment is common. They face a lot of hardships at a young age, and fanfictions often depict how they cope with it and become stronger.
Since I don't actively engage with this type of fanfiction, I can't say for sure. But generally in fanfiction, themes might include the intense emotional connection between the characters, perhaps with a romantic or sexual undertone.
One common theme is the exploration of their deep emotional bond in a romantic context. Since they already have a strong brotherly bond in the original show, fanfictions often build on that to create a more intimate, romantic relationship.
One common theme is family protection. The little sister is often in need of protection from the various supernatural threats, and Sam and Dean are always there to save her. For example, in some fics, she might be targeted by demons because of her connection to the Winchesters.
A recurring theme is the search for their place in the world. As hunters, they don't really fit into normal society. Fanfictions explore how they deal with this outsider status. Another theme is the power of friendship. They have friends in the hunting community, and how those relationships interact with their brotherly bond is often a topic. Also, the theme of fate and free will comes up, as they seem to be following a certain path but also trying to break free from it sometimes.
One common theme is family. Since Dean has such a complex family situation, many fanfictions explore his relationship with his father and brother when he was young. Another theme is his early exposure to the hunting life. It's often about how he coped with the danger and secrecy at a young age.
One common theme is the struggle with identity. As a vampire, Dean has to re - evaluate who he is. Another theme is the conflict between his vampiric instincts and his human morality. For example, he may be tempted to feed on humans but his human side holds him back.
In Hurt Dean Winchester fanfiction, a frequent theme is his self - sacrifice. Dean is always putting himself on the line for others in the show, and in fanfictions, this is often exaggerated. He might sacrifice himself in a big way and then have to face the consequences while being hurt. Also, the theme of his past traumas resurfacing when he gets hurt is quite common. His experiences in Hell, for example, might come back to haunt him when he's physically or emotionally injured.
One common theme is the struggle between good and evil. Dean often has to decide whether a vampire can be redeemed or is just pure evil. Another theme is the idea of family. His relationship with Sam and how vampires can either threaten or be integrated into their 'family' unit in a strange way. Also, there's the theme of sacrifice. Dean might have to sacrifice his own safety or even his beliefs to deal with the vampire situation.