Sam and Dean Winchester - An Old Friend
Sam and his old roommate were friends during Sam's time at Stanford, roommates during his first year. Two years have passed since they last spoke, and Sam's life has changed dramatically; back to the hunting lifestyle he was raised in, with even higher stakes than ever. The characters are set in season 3, with Sam's relationship to demons known, and with Dean's soul bound for Hell and Sam actively working to stop that. An old friend has called Sam out of the blue. Why? That's up to you. Maybe they've been bitten by a werewolf; maybe they were always secretly supernatural; maybe they're secretly a hunter too; maybe they just want to catch up. The old friend is a stranger to Dean initially, but if Sam thinks they're worth helping, well, Dean's not going to let him go that alone.