An Unlikely Supernatural Relationship

Vilda Tepes is wasting away in her cave until a strange hunter comes along and saves her, Sam takes her with him wanting to protect her as she is the lasts of the E.Vs. Dean isn't to fond of her at first, will that change as Vilda comes across an old enemy who wants her dead and will tear through anyone or thing to kill her? Will they accept her as part of the team?

(Cover credit goes to thatsbieberlove)