the_debt_of_time

"Uh-oh," James muttered as Mia stood from her seat and moved to stand on top
of the long bench. The only professor in attendance in the Great Hall was Dumbledore,
who always displayed a strange indifference to Mia's pranks.
Mia cleared her throat loudly, drawing the attention of everyone at the table and a
few eavesdroppers. She cast a Sonorus Charm on her wand and cleared her throat again to
get the attention of the entire Great Hall. "I'm just curious. Who here has had sex with
Sirius Black within the past year?"
Suddenly, the hall broke out into whispers. Gryffindors were all blushing nervously,
save for Sirius, who no longer minded the attention, considering his curiosity was definitely
piqued. He looked around the room and noted several girls he had never been with
laughing with their friends and looking smug. Most of the girls he had been with in the past
were glaring at every other witch in sight.
Sirius cringed, seeing the fruits of his amorous labours set out in front of him.
No one openly spoke in the affirmative, and Sirius glanced at Mia, wondering what
her next move would be.
Mia smiled, held her wand in the air, and spoke loudly, "Coccinus Mendax!"
A bright red light emerged from her wand and covered the Great Hall in a strange
mist.
At the Head Table, Dumbledore watched on with great interest, his eyes twinkling
at the scene.
It took all of five seconds for the screaming to begin.
Dark red splotches began appearing on no less than fifty witches, tainting the skin
around the mouths. It looked like something between a birthmark and a contagious disease
and was incredibly unappealing.
"Roughly translates to 'Crimson Liar,'" Mia stated, her voice as sweet as honey. "The
more you've lied about the question you were just asked, the more this particular charm
will have spread."
While a few girls only had a small patch covering their lips, others had their entire
faces encased in dark red.
Wands broke out, aimed at the Gryffindor table, and that was when Dumbledore
sought to intervene on Mia's behalf. He cast a rather large protective shield, his blue eyes
fixed upon the little witch. Sirius watched in awe as she stared right back at the headmaster