Percy looked up, the corner of his mouth twisted in what was almost a smirk. "Not terribly this time, but there are a couple of places where the calculations have a misplaced digit that affected the outcome. It shouldn't take me very long."
He reached inside his robes and pulled out his second-favourite quill - his primary favourite had a place of honour upon hi desk at work - and immediately set to correcting the notations. However, as he began writing, Gidget jumped up onto the counter and set to trying to 'catch' the feather end as it waved. Percy grimaced and leaned over to whisper into the dog's ear.
"If you don't behave, no cheese for you."
The dog immediately dropped to lay down on the counter, paws crossed primly, just as Percy had secretly taught him. Then without further ado, returned his attention to the accounting.