Wesley nodded and put his own spoon down as he frowned slightly. He could only assume that Severus hadn't watched his own story and it was giving him the sense of feeling slightly off balance. He hadn't come out and stated that he'd read the books, but he also had responded in such a way that he suspected Severus knew that Wesley knew at least part of the story. And if Severus didn't know Wesley's story it was certainly an imbalance to an early friendship that Wesley was beginning to feel might be worth pursuing.
"When I was young everything was very black and white," he said slowly, almost carefully. "I was raised as the son of one of the Watcher's council," he stopped to think of how to explain them to Severus and finally he backed-up slightly. "The Watcher's Council is a group that oversees the Slayer, who is a girl imbued with magical strength in order to kill vampires in our reality. The Watchers, well, the most pompous of them watch, and in all fairness that was me when I was sent to replace Giles, who was at the time Buffy's watcher. I thought I had all the answers, and that everything could be done by the rulebook."
He turned the soup spoon over in his hand and shrugged. "I couldn't have been more wrong. It took the Watcher's Council firing me for me to figure out a bit better what I could do, and it hasn't always been - like you said, one life for the greater good, and someone has to be willing to make that choice. And seldom are you loved for making it," he added quietly.
After a moments thought he filled the spoon with some soup and took a bite.
"I can think of a number of demons from our reality that might cause equal mayhem," Wesley shook his head. "When you start considering the creatures and beings that populate the fictional stories of this world, there could be a world of trouble if any of the wrong ones showed up. I'm not certain how much I trust SHIELD, but then my experience with organizations that give orders to soldiers, has hardly been exactly stellar."