Derek took a deep, steadying breath to keep himself from murdering the kid, because he was right, Derek was a teacher. But that didn't mean that he couldn't do anything at all, because out of school or not he could make Stiles' life hell when they returned.
But then he felt a slight tugging at his shoes, and looked down to find...the cutest fucking puppy to have ever existed, Derek was pretty sure. It was made up entirely of big blue eyes and fluff. Derek frowned and tilted his head, crouching down so he was eye to eye with the dog. It was obviously Stilinski's, it smelled like him, but not enough to have been with him long. Derek remembered, very vaguely, him posting something about getting a pet on the journals, so apparently this was the pet. He reached out, allowing the dog to sniff him - some could smell the wolf in him and immediately recoiled or attacked, and he didn't like making any animal, magical or not, nervous. "What's it's name?" he asked of Stilinski, still focused solely on the dog.