Malfoy hasn't made any of the process easy, despite his odd, drunken cheerfulness in the face of what has to be sheer agony. He had refused to let Hermione stupefy him, and she had said that she couldn't trust him to keep still and she couldn't have him moving, and in the end they had settled for magically lashing his arms to the bedposts in some awful mimicry of bondage. It keeps him still though, which is the important part. The sight of his arms stretched across the bed in a horizontal parody of crucifixion is unsettling though.