wing!kink, destiel, non au,

[o-kay]

hey! i'm sorry if I have tagged this wrong but it is my first time posting on here, anyways,
the fic i'm looking for starts out where for some reason (I forget why) but its basically where in order to locate someone or break a curse they need to use the oil from castiels wings and cas asks sam to leave and he takes off his coat and I think his wings are blue (I can't be sure) and there are oil glands under his wings and he gets pleasure from being touched there idk and his and dean end up having sex and getting covered in the oil.
sorry if this was a really bad description but I tried haha.

thanks!