Fred sniggered as another snowball bounced off the back of Quirrel's turban, and George was about to charm another one to do it when a small hand tugged on his robes.
"Hello, Fred and George." The twins turned around to see Mayumi, "I was wondering, can you teach me this handy little charm you're using now?"
"Oh?"
"Is our-"
"Helpful little housemate-"
"Interested in the art of-"
"Pranking now?"
Mayumi tilts her head. "Just a few particular people." She smiled, "I'd also like to borrow a... Well, a particular map sometimes."
They shared a look.
"In exchange, I will warn you of any forseeaby dangers to your pranking business..." They hesitantly frowned,"... And the name of one of the Marauders."
"Deal."