In this excerpt from "The Reckoning" by Kelley Armstrong, Simon observes that the relationship between the speaker and Derek seems to be improving. He questions what changed, speculating that Derek may have used his signature expression to win back favor. This expression, likened to a "whipped puppy," evokes a sense of guilt in others for any harsh treatment directed toward him.
The speaker confirms that this look affects them as well, leading to laughter over the influence it has even on their father. They humorously acknowledge how the whole family tends to relent when faced with Derek's remorseful demeanor, ultimately leading to his mischievous behavior returning when they frame it as acceptable again.