the_debt_of_time

"But you said you hated pranks. You told me and James we were childish and
immature because we made Rikard Stebbins's hair vanish." He grinned at the memory.
"Because you had a childish reason," she defended.
"And you yelled at me and Peter for charming Snivellus's shoes to quack when he
walked," Sirius added.
"That was stupid. He just changed his shoes. You should have put a sticking charm
on them," she said under her breath, clearly not realising she had spoken aloud when her
eyes widened and she looked at him, covering her mouth.
But it was too late; Sirius heard. "You want to prank with us! Mia, I'm so happy!"
"Just once!" she reiterated firmly. "And only because I think Regulus deserves it."