"You didn't," Kai says, and it's not that he doesn't believe it, exactly, so much that he doesn't think this would be down to a random accident of fate. He can't see Marco choosing someone like Kai for much of anything at all, except maybe a target for some scheme.

Then again, Marco doesn't seem the type for that.

Kai's thoughts flare suddenly with a bright certainty of alarm, and he reaches out to grip tight to Marco's arm. "You need to consider that this may be a plot of my father's." He's definitely not above controlling Kai somehow, and Marco seems more likely to end up a victim of such a plot than the perpetrator of one.