"In this instance, yes." Castiel replied without missing a beat, his tone taking on a more sarcastic quality that he had worked out some people found humorous - particularly Dean. "I do say so. I was only watching videos of cats which are not nearly as important as you. In fact, you saved me. Those videos are not as entertaining as people think."
He could sense the appreciation in the gesture and knew Dean was a man of few words when it came to expressing emotions he considered 'touchy feely' or 'chick flick moments'. Of course, Cas didn't expect any sort of gratitude. At first he was just following orders but then he was doing what he believed was his duty as a friend.
Castiel's gaze remained honest, seeing no point in lying to his friend about this. "Even then." The Angel confirmed, watching Dean and waiting for his reaction.