Still, despite the relatively good balance of pleasant tasks to unpleasant ones at the moment, the Potions Master actually was starting to feel a sense of deep unhappiness in his job. This year was the year that Lily's son would have begun school, should have begun school, had Snape not been so astoundingly stupid as to get them all killed by reporting the prophecy to Voldemort. And so he felt very much like he did not belong. Who was he to be blithely going about his life, teaching classes (how strangely mundane it felt, still, after the War), as if Lily Evans had never been (and shone and fought and died)?