He carried out the spanking in silence, but the air of the room was getting hotter and hotter, thicker and thicker, Potter fought to hold still and stay silent, but his breathing got heavier and heavier, and Draco could tell, from the way Potter discreetly adjusted his position, Potter was hard. He liked this. Draco already knew from the show last time that he did. But it felt very different when it was Draco giving him this.