Very well done.

I like this a lot. I enjoy the idea that Giles sent Willow to Hogwarts to learn control. LOL. I also like the near-parallel of what caused Willow to go dark versus what keeps Snape from going dark again-the death of someone they loved.

My favorite part was: "Do you still miss it?" He still misses her.

Snape was very honest with Willow, which I appreciate. :)

Nice. I like the stilted interaction between Willow and Snape (Willow was my favorite on Buffy), and I can actually hear Snape's lazy drawl and Willow's -well, her way. How does one describe Willow? haha

Is this going to be a longer story, or a oneshot? I'd like to see it continued.