Crowley was annoyed with this whole process. He was used to convincing people to do things. Using his charm and charisma. But the stupid Winchesters had corrupted this prophet and he had to resort to torture. He had always found torture beneath him and had left that to the likes of Alistair.
However, as he continued along, he found that it was kind of fun. He thought Kevin might even be coming around. At this point, he almost didn't care. He was taking all his hatred of the Winchesters out on Kevin. It served them right. Always screwing up his plans.