Ghost Riders
The road dropped me in his path, and in spite of my better judgement, I got into his beautiful car. Guess it was my night to save Dean Winchester.
This is a crossover with Seanan McGuire's Ghost Roads series about a young girl who becomes a hitchhiking ghost as well as a psychopomp and guardian to travelers after she is run off the road and killed on her way to meet her prom date. There are two books in the series so far, and I highly recommend them to SPN fans. I feel like Dean and his Baby would fit very well in Rose Marshall's world, and this story came from a desire to see how that might play out. (This was a WIP for far too long, but it's finally finished, so I'm giving it its own entry here--I'm excited to know what you think!)
Link to Ao3.