Jossverse Drabbles Challenge: calculate

by Red Wolf

Andrew found Xander staring at the walls of his office.

"You know that look the girls get when they're up to something? Not the one where they snicker and nudge each other when they're trying to prank you. It's more like when they're watching the clock in anticipation of something."

"Who have you got at the moment?" Andrew ran through Xander's class list. "Um, aren't these two chemistry geeks?"

"Yeah. So?"

"Why didn't you break them up? When you get more than one in a class they start completing." The dull explosion of a toilet echoed down the halls. "See?"