Tabitha is the black sheep of the Winchesters: she works for the FBI. But when her brothers need her, she finds herself hunting with them again. Now she’s trying her best to help her brothers, but that’s easier said than done. So is trying to rebuild the relationship with them when she finds herself becoming closer with an angel instead. Starts in season 4 of Supernatural — SisterFic and eventual Castiel/OC

Cassidy Gray has always loved American Muscles. So when she spots Sam and Dean's 1967 Chevrolet Impala abandoned in a junk yard, she knew she had to buy her. But what she discovered when she restored the car, she definately didn't expect. Their father's journal was one of them. She cast them aside at first, but when Demons came knocking on her door that night, she had no choice but to believe in it.