the_debt_of_time

James blinked and looked around the room. "What's happening? What did you do?"
he demanded, narrowing his eyes at his sister before grabbing a spoon and examining his
reflection.
"Oh, I just slipped a potion in with everyone's morning juice." Mia smiled
innocently.
"Clever, kitten." Sirius chuckled, rolling his eyes as he ran fingers through his sky
blue hair. "Is this supposed to be a prank? Random shades of colour? Could have done that
with a simple Colour Change Charm. You wasted a potion on this? That's barely an
Acceptable in my book."
Mia sat tall, looking down at her nails as though she were inspecting a fresh
manicure. "Oh, I did use a Colour Change Charm. I used individual ones on each lacewing
fly that went into my modified Polyjuice Potion."
"So you slipped us Polyjuice?" James blinked, confused as he blew strands of hair
out of his face. It looked much more out of control than his black hair ever did, which was
saying something. He patted his palms down his chest and then inspected his fingers. "I
don't get it. Why'd only our hair change? And shouldn't we all look alike?"
"That's if you use the hair of any normal witch or wizard, but if you use the hair of a
Metamorphmagus, you can allow the drinkers of the potions to essentially alter
themselves."
Mia was grateful for her past friendship with Nymphadora Tonks-Lupin who had
once confessed that Metamorphmagi were immune to Polyjuice Potion, as they could
change the shape of their face and colour of their hair at will. She was even more grateful
to find that Professor Slughorn's collection of strange and rare ingredients—which
included hairs from goblins, werewolves, and one Metamorphmagus—rivalled that of
Professor Snape. She was just as easily able to pilfer from one as she was from the other.
"Did you know that most Metamorphmagi hair changes colour to depict their
moods?" She looked across the table at Remus, who was grinning at her, clearly impressed.
"I got the idea from Lily's mood ring."
"Fine, fine. You're very bright; cleverest witch ever," James conceded while rolling
his eyes. "Now what do the colours mean?"
"Well," Lily chimed in, amused. "The Slytherins are predictable—black and dark
green showing anger and envy. They're presumably upset at what Mia's done to them and