A possible plot could be that Sam discovers an underground fighting ring where the prize money is huge. He decides to enter, thinking he can handle himself. But he quickly realizes that the fighters there are much tougher than he expected. Meanwhile, Dean has no idea what Sam is up to. Sam endures several tough fights, getting injured in the process. However, his determination to get the money for Dean's car keeps him going. He eventually makes it to the final fight and if he wins, he'll have enough money to fix up Dean's beloved car.
Well, Sam could try getting a part - time job. Maybe he could work at a local diner or a garage. Working at a garage would be quite fitting since it's related to cars. He could earn some extra cash by helping out with car repairs or maintenance.
Bobby could be a big help. He might have some old contacts who could offer Sam some odd jobs or even some valuable items to sell. Another person could be Castiel. He could use his angelic powers to help Sam find something valuable that he can turn into money. Maybe he could lead Sam to a hidden treasure or a rare artifact that has a high value.
Sam may struggle with getting reliable transportation to get to his money - making opportunities. Since they usually rely on the car, and he's trying to fix Dean's car, he might have to rely on public transportation or hitchhiking which can be unreliable. Also, he may run into people who try to take advantage of him. For example, if he's doing odd jobs, some customers might try to pay him less than what he's worth or make him do extra work without extra pay. This can slow down his progress in getting enough money for the car.
A unique plot could be that their marriage gives them new powers. Since they are so closely bonded now as husbands, they can combine their powers in ways they couldn't before. For example, when facing a powerful demon, their united power makes them invincible.
One idea could be that Bella discovers she has special powers because of her relation to Sam and Dean. Maybe she can communicate with spirits in a unique way that helps them on their hunts.
One idea could be that they go back to the time when their parents first met. They could try to prevent some dark force from interfering with their relationship, which would change the course of their family's future. Another plot could be them going back to a crucial moment in the fight against a major demon, and they use their present - day knowledge to change the outcome for the better.
Another plot could involve a family mystery. Maybe they discover a long - lost relative who has a dark secret that endangers them all. They then have to work together to uncover the truth and protect their family. It could involve researching old family records, interviewing people from their past, and facing off against those who want to keep the secret buried.
Perhaps in a fanfiction where there is a supernatural force at play. This force makes Sam act out of character and he kisses Dean on the neck. Dean is initially shocked but then realizes that Sam is not in control. They then have to figure out how to break the spell while also dealing with the new - found awkwardness and the underlying emotions that the kiss has brought to the surface.
She could be a nephilim, half - angel and half - human. This would put her in great danger as both angels and demons would be after her. Sam and Dean would have to constantly protect her and figure out a way to keep her powers in check.
Well, perhaps in this fan fiction, evil Dean and Sam are vampires who have been around for centuries. They giggle because they've developed a rather dark sense of humor over time. Their giggling often occurs when they plan elaborate schemes to outwit hunters. For example, they might leave false trails or set up traps for those who come after them. And as vampires, they have unique abilities that they use in these devious plans, like mind - controlling some humans to do their bidding while they stand back and giggle at the chaos they create.