"No," said Twilight.
"But, Your Highness—"
"I said no. I am not allowing anypony to wait for me to do my business like I'm their pet cat."
"But the nation's economy—"
"Already has three alicorns producing, all of whom, I will note, have physically larger bladders and kidneys."
"But the danger—"
"Even before I ascended, I was Celestia's personal student, the Bearer of Magic, and the sister of the Prince-Consort of the Crystal Empire nee captain of the Royal Guard. I am barely a higher-level target now than I was before the wings. Oh, and I was looking after a dragon practically from the day I hatched him. Believe me, I know how to deal with physical byproducts safely. Honestly, if you want to be useful, go talk to my friends. I still can't get them to burn their hoof trimmings."
"You do have to make allowances for commoners, Your Highness. But with the aqua princips—"
"You'll get whatever I'll have left."
"... Your Highness?"
"I now produce one of the most valuable arcane reagents in the world without even trying. I'm calling dibs."