Last sentence doesn't exactly make proper grammatical sense, but just... ignore it. People who know both fandoms well enough should know what it really refers to, anyway. I think this is the first proper drabble I've written- half the time it winds up being three times longer than needed.
...I think I overdid the butterfly symbolism.
Disclaimer: I wonder how much Yuuko charges to own all the fandoms I like...
"The fact that you're here means that you have a wish."
He thought of his parents' disappointed faces. "I want to fix the Fenton Portal."
"That is your wish?"
He nodded, and for a moment, she saw pearl-white hair, and a hazmat suit.
"Your wish will be granted." Mokona's short fur slid through her caressing fingers.
Settling the origami butterfly he had been fingering back onto her palm, Daniel Fenton left the store, sliding the butterfly-patterned shoji door shut behind him.
Her voice trailed after his steps, whispering like butterfly wings. "Your payment when you fix the Portal, Phantom."