Jay snorts and shakes his head, both hands now on the wheel and eyes ahead. "I'm scum, but I don't shame people for their biological shortcomings," he reassures Sean. "So long as you don't go and be an idiot drinking yourself under the table despite knowing you're a lightweight."

He's only partially joking, there, because if there's one thing he and his brother share in common is that they don't suffer fools.