He smiles at the confirmation and at the way Seto talks about Yugi. The situation aboard the train can be fluid and stressful and sometimes dangerous, but amidst it all, this is unequivocally a good thing for Seto. Hadn't he recently been worried that he didn't know how to socialize with people outside of a corporate power structure? And yet here he is, in a romantic relationship. It seems he is doing better than he thinks.

"I see the first duel in space is no longer your top priority." One joke deserves another, regardless of size.

He lets it settle for a few moments before continuing on. "Do you not think he would want to know what is preventing you from sleeping?"