Stephen and Illy
He noticed that daydream gleam in her eyes and did a double take. She might burn the world down, but he doubted she was going to do that with firework spells. They were sparks and bedazzlement, but not as explosive as the real thing. It was safe to show her that, but maybe keep her away from anything else that could be highly combustible. At least for now.
"We can make them silent," he replied, "but I think people expect the noise. This way is better. Less air pollution too."
He took the time to explain the spell casting in great detail, hoping it didn't result in any broken windows or calls in to the NYFD.