Can't find the story
I am trying to find the story where Dean is just out from Hell, and Alastair is really pissed , because his fav student (Dean) is gone. He enters cell of OC girl, and start to torture her. to capture Dean. But, than Alastair promises her, if she brings Dean back, she will be freed and gives her deadline to bring him back, he also ask to find about what supernatural force took Dean away. They seals deal with a kiss. Alastair also threaten her that, if she fail or run away, he will find her and torture her like old time. He also gives her a necklace that could communicate with him. The girl meet Dean and Sam, while they are hunting for demons. She runs to them and tells demons are after them because she overheard something important (which i do not remember). She lies her name, but not last name, which eventually Sam will do research and find about her really name.

As the story goes, she slowly fell in love with Dean;
when they first met she was scared of him due to her fear that Dean would remember her from hell and her trauma from hell; Dean's tortured her. Also she have nightmare or she communicate with Alastair when she sleep, and receive some torture to remind her to never fail. When she learn an angel help Dean, she goes to bathroom and tells Alastair (by using reckless). Dean also take away her necklace, because he had feeling that he saw necklace somewhere.

This was found some where in fanfiction.net, I don't know the rating or if this was in complete or completed story.