The Chase
Severus was happily - well, happily for him - working on his newest refinement of the Pepper-Up potion; several of the students were allergic to mint, which was a major component in the standard batch.
Severus crossed to his workstation with a clean board and knife and a fresh jar of shredded juniper. Just as he reached it he suddenly sighed heavily, looking skyward, as he felt a high-speed brush of fur across the backs of his ankles.
He froze in mid movement as he felt the second, and, with exaggerated slowness, set down the chopping block in his hands on the counter in front of him.
The two cats, recognizing this not as a sign of tolerance, but as a warning sign of his dangerous mood, stopped their game of chase and slunk out to sit behind him.
"Have you two lost your minds! If you simply must try to kill each other, at the very least, don't do it in my lab!"
Harry and Draco hung their heads ashamedly. They knew that it had been a stupid thing to do.
They left the room quietly, knowing they'd got off easy if that was all Severus had to say - yell, rather.
~Fin~
This one is not actually from a prompt word - my cats inspired it by trying to kill each other all across the house whilst I was writing. I do the same thing Severus did - the exaggerated slowness - and the cats do know that it means I am really pissed, and generally quit immediately.
