Prompto's words made Ignis pause, his lips pressed to Noctis' thigh as he let them wash over him. He knew what Prompto was doing and he knew how much it might affect their king. Perhaps he could use that to his advantage while savoring Noctis.

He muffled a low laugh against the warm skin there before he worked a mark to the surface of Noct's skin, then pressing a kiss to the darkened skin before letting his lips drift a little closer to where Noctis obviously wanted him.

He said to put his mouth to good use. He never specified where and when Ignis was in the right mood, he could be a hell of a tease.