Good 'Sam and Dean' slash fiction usually has strong characterizations. It stays true to the personalities of Sam and Dean from the original source. For example, Sam's intelligence and Dean's protectiveness should be well - represented.
There's a fic called 'Brothers Beyond Blood' that's quite well - received in the 'Sam and Dean' slash fic community. It focuses on how they support each other through tough times and the underlying feelings that might be more than just brotherly love. However,slash fictions can vary a great deal in terms of writing style and the intensity of the relationship portrayed.
One common theme is loyalty. Their loyalty to each other is often explored in different ways, like how far they would go for one another. It's a fundamental part of their relationship in the fanfictions.
One popular 'Supernatural Sam and Dean slash fanfiction' is 'A Different Kind of Bond'. It delves deep into the complex relationship between Sam and Dean in an interesting way. The story has great character development and the writing style is engaging.
The relationship between Sam and Dean in the show is already so deep and complex. Fanfiction allows fans to explore a different, more romantic or slash - based side of it that isn't fully explored in the original series.
One popular 'Supernatural Sam Dean Slash Fanfiction' is 'The Road Less Traveled'. It delves deep into the complex relationship between Sam and Dean in a very engaging way.
There's also 'A Hunter's Legacy'. It's set in an alternate universe where Dean and Sam face different challenges. The author does an amazing job of capturing their personalities. The story is full of twists and turns that keep you on the edge of your seat, and it really showcases the unique bond between the two brothers.
For Dean, you could develop his character as a vampire by emphasizing his protective instincts, but in a more vampiric way. He might protect his territory or his 'blood sources' aggressively. His giggling could come from a place of enjoying the power he has. For Sam, his intelligence could be enhanced as a vampire. He could use his smarts to find new ways to survive. His giggling might be more of a nervous reaction to the new and often immoral things they have to do as vampires.
Another good one is 'Unexpected Affection'. It takes an interesting approach to the scenario, exploring how it would affect the characters' dynamic not only with each other but also with other characters in the Supernatural universe. It's a bit more action - packed compared to some others.
One great fanfiction is 'The Road So Far' which delves deep into the complex relationship between Dean and Sam. It shows their bond in the face of various supernatural threats. Another one is 'Brothers in Arms' that focuses on how they support each other through difficult times in the hunting world. There's also 'Family Ties' which explores their family dynamic in a unique and engaging way.