One common theme is Sam's vulnerability. When he's sick, it shows a side of him that's not always on display. Another theme could be the brothers' relationship. Dean might be extra protective or worried. And sometimes, there's the theme of Sam fighting against whatever is making him sick, like a supernatural illness.
One common theme is Sam's brothers taking care of him. Dean, in particular, is usually very protective when Sam is sick. Another theme could be Sam's struggle with whatever is making him sick, whether it's a supernatural illness or just a regular human ailment but in a world full of the supernatural.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of 'Supernatural' fanfictions. Just search for 'Sam sick' and you'll get a bunch of relevant stories. Another option is FanFiction.net, which also has a lot of fan - created content related to the show.
You can try fanfiction websites like Archive of Our Own (AO3). There are tons of 'Supernatural' fanfictions there, and you can easily search for 'Sick Sam' ones. Just type in the relevant tags in the search bar, and it'll show you a list of available stories.
Carly would probably be the first one to take care of Sam. They're best friends, after all. She'd bring her soup and make sure she has enough blankets.
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.
In a fanfiction, Sam might be sick due to overexposure to some ectoplasmic substance. Danny feels guilty because he thinks it might be his fault since he often brings ectoplasm around. Tucker tries to help by using his tech - savvy skills to find a cure. Danny stays by Sam's side, and they have some really sweet moments where Danny realizes how much Sam means to him. As he's waiting for Tucker to find a solution, he tries to keep Sam's spirits up and tells her stories about his ghost adventures.
Dean is almost always going to be in these fanfictions when Sam is gagged. Their relationship is central to Supernatural. Rowena could also be a character. She might use her magic to either gag Sam for her own purposes or to help him if she has a change of heart. And Gabriel. He could turn up and use his trickster abilities to either put Sam in the gagged situation as a joke or to get him out of a more serious one.
One great fanfiction is 'Sam and Rowena's Unlikely Alliance'. In this story, they team up to face a powerful new threat that the Winchesters alone can't handle. It has a lot of great character development for both Sam and Rowena, showing their complex relationship in a new light. The author does a wonderful job of capturing their voices, making it feel like an extension of the show.
One great fanfiction could be where Dean and Sam have to face a unique Halloween - themed monster. Maybe a witch who uses Halloween traditions to cast powerful spells. They would have to use their wits and hunting skills to stop her before she causes chaos in a small town.