[The comment was a coincidence, mostly at least. He doesn't necessarily think that his new companion is a spy, rather than that he's just shooting in the dark, poking playfully around to see if any of his comments would land.]

Wouldn't that make them a rather bad spy if I were to able to tell them apart that easily. [He's worked as a spy of sorts, in a way, so he knows what all goes into the act. The key is actually lie just enough to divert any suspicions, while keeping your own backstory and life as close to reality as possible. Akechi, of course, had taken things to extreme.]

Haha, but I suppose you're right. [He chuckles out a laughter, leaning head to side to look at Kaeya through his brown curls.] The romantic in me just likes to believe such stories to be true. Rather silly of me.