"Heir and a spare," he says, completely out of the blue, because he can at least throw Lan Xichen something -- something that does relate, even if it's not the actual problem. "Sect requirement for bloodline. What happens if neither want to marry or have children?"

Because he knows he has no interest, and Lan Xichen? Well, he knows who he's close to, and, well. Jin Guangyao definitely doesn't have birthing hips.