Draco didn't fancy being turned into a dog but he decided to keep that revelation to himself, especially since he didn't want to give her ideas. He wanted to enjoy this on his terms, even if his terms were to follow her orders. He had a natural aversion to transformations. There was something rather unpleasant sounding about being an animal and he didn't want to experience, no matter how good the sex may be.
He kept his hands still as she placed the collar on him. It was tight but he rather liked the sharp edge it added. At her command he sank slowly to his knees, making every move deliberate and languid. He placed his hands on the floor and looked up at her, his mouth closed as he waited to see what she wanted to do next.