[Yeah, that's about what he expected. Though he'd hoped that the statement would be surprising enough to catch him off guard, Kokichi is just way too practiced in masking his thoughts and emotions. Oh well, he tried.]

[As for his reaction...]

A-aha... [He seems to think Kokichi is joking, purposefully trying to make him uncomfortable by bringing up the card again and invading his personal space. So does he get flustered? Absolutely. He scoots back a little, cheeks faintly pink.] It seems a little...unfair to decide on a prize after the fact. So...I'll pass on making that decision. Besides, I'm still not completely sure that I want to play so...I won't punish you by making you complete a square with me.

[Because if it's a "prize" for Shuichi to pick one of their shared squares to complete...then the opposite is true for Kokichi, right? Whatever square he hypothetically picked would be a punishment.]