Because she cared so much about him. The thought made him cringe on the inside, but he replied with what she wanted to hear. "Of course you're allowed, Aunt. I'm faring well, but I'm also busy. There's a high-demand for everything I've made because it's actually useful, but I guess it's good to be busy," he told her, shrugging.
"It'll be eight sickles," Scorpius answered, and before he turned around to get her bottle of lotion, he turned the piece of parchment over.