Fragile (Castiel fanfic)

Solar is a new Angel, and she is scared of a lot of things. Castiel was assigned her mentor and he also became a close friend for her. She is taught everything he knows but she also knows Dean Winchester.

Solar has lost a few friends and she is mainly scared to lose Castiel. He has become a brother figure to her. Castiel does his damnest to make sure no demons get their hands on her.

What will happen when Alastair gets his hands on her?