This is a wincest classic, I believe, here in LJ: a series about Sam and Dean, and the one I really remember very vividly is when Dean runs away from Sam and Sam manages to track him down using his psychic abilities with help from Missouri. They then got tattoos where they could locate each other. The series also had a part about John's death and Dean's grief, and Sammy fixing the Impala. Another part of the series was when Dean visited Cassie and Sam was jealous and angsted on the beach. There was also one where, many, many years into the future, Dean died suddenly and had to watch Sam's grief for the day until Sam, inevitably, joined him later.

Somehow, I remember all of that, but not the goddamn titles or the author. Thank you in advance!