That was a very interesting start to an intriguing story. I loved how both Severus and Lily were conflicted over the proposition, but ended up accepting the proposition to kill one another. I really liked how they also had different reasons to do so: Snape with jealousy and Lily for revenge.
I really liked how the story blended so well together. It didn't even seem as if two different people wrote the different perspectives, except for the fact that one was in first person and the other was in third. The two parts just flowed right into each other.
Oooh, a cliff hanger. Well, I just can't just sit here and not see what happens next! Great submission, can't wait to see what happens in the next chapter..