Surprised at first at the change in tone their dance had taken, it only showed in the widening of his smile and the way his hands shifted to Harry's hips to pull him closer. Close enough to let him feel the effect the dance was having on him.
The slight but increasing friction sent small sparks of electricity through his nerve endings, sparks that renewed with every motion of their bodies. Eventually his eyes fluttered shut and he lowered his head, searching out Harry's ear again. His voice, when he found it, whispered hoarsely into it.