the_debt_of_time

"Me?" she asked, acting innocent to the point of batting her eyelashes. "I know
exactly where I am."
"What are you up to?" Sirius asked her point-blank.
"What are you up to?" she countered. "It appears that all of us are out past curfew."
"We at least have the cloak," James protested, narrowing a suspicious gaze at her.
"We're not going to get caught."
Mia rolled her eyes and tapped her wand on the top of her head, recasting the
Disillusionment Charm on herself and very nearly disappearing into the stone background
of the wall behind her. "It only counts if you're actually wearing the cloak, Jamie."
Sirius looked amused, as usual. James looked mildly embarrassed as he scrambled
for the cloak. Peter looked flustered and nervous.
She glared at him with a murderous look in her eye, glad that they could not see
her. "What's wrong, Pete? Worried that you're being watched by someone you can't see?"
"Very funny. Come on out, Mia," James said with a chuckle. When she was visible
once more, he asked, "Seriously, what are you doing out past curfew?"
She put her hands defiantly on her hips. "I asked you the same thing."
"My-uh!" James whinged.
"Jay-mee!" Mia copied, matching his tone and pitch.
"We were looking for Ravenclaw's lost diadem," Sirius blurted out. When Peter and
James looked at him incredulously, he went on, "What? It's not technically a lie. We were
doing that all week before tonight."
Mia smirked at him. "Good luck finding that."
James shook his head and waited another moment, staring at her with a strained
expression that she assumed he thought was intimidating but came off looking a bit
constipated. He was just precious.
When she remained silent, refusing to "fess up," James huffed. "Fine, we'll wait until
the next time you go out and track you then."
"You won't find me." Mia grinned smugly. "Your map isn't finished."
All three boys swallowed and stared at her.
"What?" James gaped. "What map?"
"The map you four have created of Hogwarts and all the secret passages that lead
into Hogsmeade." She chuckled softly and watched as their eyes widened.