Severus Snape Was a Pessimist

With the war gearing up again, the Dark Lord running rampant, and a ministry official wearing (shudder) pink taking over the school, Severus Snape knows this year will be one of the worst. At least there's the mystery of the new professor to keep him distracted. Why does the man simultaneously terrify and intrigue him? And what's with his strange friendship with Potter? Time-Travel