Severus would probably laugh. Actually laugh. It's one thing to think Harry might have been forcing himself to be blind to it, desperate for a sense of approval and belonging-- Severus even understands that. He understands the magnetism of people with ancient magic, and had one of them approached him? Yes, he probably would have consented to dealing with them. Who knows how it would have gone for someone like him, both predisposed to knowing better and to being susceptible to it. But he wouldn't have been so blind. And to have Harry - Harry Potter, Boy Who Lived, Sainted Savior of Everything - claim No, it really is just that I'm this stupid would be unbelievable.

It's maddening.

But maybe fitting for someone doomed with James Potter's genetic contributions, he thinks viciously, and palms over his forehead in irritation. He almost snaps 'Nothing!' and sends him away, so unimpressed by the dull subject change. "Send a Patronus to Lupin," he all but growls, "See if he'll respond to you."