Castiel didn't know how many times Dean had stared at him that year or when he had started, but he did know that the first time he had caught him was three weeks ago in bio. And then again the next day in English. And then again the same day in geometry, and so on. And now here he was, three weeks later, sitting in bio once again with the feeling of eyes watching him. He glanced to his left slightly, and sure enough, those candy apple green eyes were gazing in his direction.