"Oh, I’m deadly serious, love. You’re the star tonight, and whilst this dress truly shines, I want you glowing and burning from the inside out, just like the real thing. I’ve adapted the muggle technology so that I can control it though my will, and added a muffliato charm so no one will be able to hear it. You just need to be able to control yourself." He reaches around her and takes it out of the box. 