That was beautiful. *sob* I could totally picture Snape and everything. Please write more. :D

Loved it! Excellent. Snape's one of my favorite characters of all, maybe my all-time favorite, so I especially love Snape fanfics! :)

That was brilliant. Brilliant. You made me tear up--and I don't tear up reading fanfiction. Period.

I shouldn't be thinking about philosophy, because my exam is over, but your story reminded me of Sartre's philosophy on bad faith--making yourself into a thing (a thing in itself) so as not to have to make a choice. The way you described Snape in the beginning, he tried to take away his own ability to constantly make choices, so throughout the story, it was like he was slowly coming back to a point where he was ready to take responsibility for his decisions. I don't know if it was intentional, but it was fantastic all the same.

I also really like what you did with the massacre, and Greyback mangling that red-haired woman--it was frightening but also moving. You made it clear that Snape was reminded of Lily without ever saying her name.

The only thing I might change is when Voldemort asks Snape to "apply for Professorship"--"apply for a teaching post", or just "apply for a post" might work better.

Oh, before I forget, I like how you ended with Dumbledore, because they were close, much closer than Snape could have ever been to Voldemort, and it's pretty much entirely because of Lily. You did an amazing job! Wonderful story, and have a Happy New Year!