The Slytherin vursus Gryffindor Match is up soon, and Mayumi, as usual, had opened her own betting pool.
"You really should stop," Hermione commented as she spotted Mayumi egging several Slytherin first and second years on, "This isn't... morally correct."
"How much do you make anyway?" Ron asked.
"Oh, just a little over twenty gallons per week." She shrugs, grinning. "If there's a Quidditch match, about several hundred."
"Merlin, Mayumi, I'm in."
"Ron!" Hermione gasped, scandalized. But Ron is already walking away with Mayumi, who is hissing her predictions into Ron's ear.