My first mistake was starting to read this without checking if it was completed. My second was getting so sucked into it that realizing it *wasn't* was devastating. Please, *please*, finish this!
It is so rare to get a glimpse into Snape's mind, and rarer still for that glimpse to properly capture the complexity of his character. This *is* the Snape that we loathed for so many years, and yet grew to love after we knew his whole story. The deeply flawed human being who was nevertheless a hero.
So thank you for letting him live, though he may not thank you for it, and thank you for giving us this look at the implications of that.
Please let this story live, too!