The infidelity prompt was handled so artfully. The backdrop of Harry and Snape's relationship highlighted just how unreasoned and insignificant it was in Snape's eyes. Indifference...
What I really liked about this was the detail provided about each of their lives--Harry's quest for the perfect wood and the description of Snape's potion ingredients. Because it was their lives mattered, when you got down to it.
Great job with a difficulty and delicate prompt, Dragon! ROAR!!