[Never underestimate how fascinating Mephisto finds all of this... but he can do his own practicing too, closing his eyes to focus on a spell he's been working on-- but he'll stop when he peeks open an eye to see Yona's hair, look at this embarrassing stage dad--]

Oh! You managed to get the color right! It still needs to cover a bit more, but-- why, at this rate, you might even perfect it by the end of the day!