So, I remember reading this fic once about someone having been cursed inside Dean's amulet but I can't remember who wrote it or what it was called.

The spirit was completely in love with Dean. I can't remember much but the ending won't get out of my head. Cas finds out about there being someone stuck in the amulet and is able to communicate with him and relay what he's saying to Dean, who I think is standing in front of a mirror. Unsure though.

I remember the spirit asking Cas to tell Dean that he (the spirit) loves him and Cas refusing because of... something to do with Dean and him bring wary of love and if he found out that someone had loved him for so long and he didn't know it love would lose it's meaning or something. I can't actually remember that bit very well.

Also, I think that the spirit in the amulet had some sort of powers too and was interfering with their relationship and I think with Dean's past conquests. Sorry for not having anymore details.

Thanks for any help!