He opens his mouth and then shuts it again, because they're mostly around each other these days. But he had to say some when he got in the door, right?

Percy gulps down some juice, waving a hand like that explains anything at all about the situation. "There's this thing Arthur wants me to look into about some business over-fishing or something. He basically said 'hey can you go to this thing and see if there's anything suspicious', and I went 'okay', because - well, you know. Fish. Except it turns out this thing is actually a fancy - I don't know, something, it's fancy. And the chances of me putting my foot in my mouth are pretty much ninety to a hundred percent, so I was hoping that you would come. With me. And help me not do that."

That sounded believable, right?