two : laughter
The girl burst out laughing without warning, leaning back perilously out the window; if not careful, she could tip out easily.
With an embarrassed scowl, Sirius hissed, "Would you shut up? You'll get me caught–"
She interrupted his demand with another snort of giggles. Realizing Kreacher could lurk into the room at any moment, Sirius pleaded. "Please be–"
"Aren't you petty?" said the girl, amused. "You're such a child."
Like he'd never heard that before.
"Shut up–"
She snickered again. Sirius cursed.
He contemplated on shoving her out the window, but to his disappointment, she hopped down from the ledge.