as a person with almost a thousand bookmarks, i have to create limits, so this list is my top five sam/dean fics that are long fics that came to mind when i gave myself those instructions (in no particular order):

Old Country by astolat

Sam and Dean go to Hogwarts.

The Last Outpost of All That Is by gekizetsu

Saturday, September 13th, 2008; 4:29 am EST

The world ends while they’re asleep.

his shoulders blot out the stars (but the minutes don't stop) by scorpiod

A hunt gone wrong leaves sixteen year old Sam a vampire, and forces Dean to choose between his baby brother and his father. John wants to put Sam down. Dean chooses to save him. He takes Sam and runs. Together they embark on a roadtrip of a quest across America to find a cure. There are rumors, whispers of a secret vampire cure—they just need to find the recipe. All Sam has to do in the meantime is not feed on human blood until they cure him.

Easy peasy.

Unfortunately, resisting the pull of human blood is hard when your brother is sleeping in the next bed over. And Sam’s new overpowered senses let him pick up on some peculiarities he wouldn’t have otherwise, like where Dean sneaks off to in the middle of the night to make some extra cash, or that Dean’s feelings for his brother are more than brotherly.

The Fetters of Fenrir by leonidaslion

How far would you go to reclaim the other half of your soul?

On Your Guard by theproblematique

After the existence of the supernatural became common knowledge, the general public turned to hunters for answers. This group of unsung heroes, who had lived in the shadows for so long, was thrust into superstardom overnight and looked to for safety above all else. Among them, no hunter was more famous than Dean Winchester: a fan-favorite American icon who helped banish all demons from Earth.

His mysterious younger brother, however, had been absent from the public eye for years.