Another Lily

It had no return address, only her name, Lily Ryann, boldly printed on the front in a harried scrawl. Lily opened it gingerly and withdrew a rather ancient looking piece of folded, seemingly blank looking parchment. She found a note: Tap the parchment and say: I solemnly swear that I am up to no good. When you're done: Mischief managed. It's time he was beat at his own game.