[If he opened his mouth to say that it wasn't really suspicion or anything, he gets cut off by the party talk, with a different kind of uncomfortable sense that is at least more familiar as just The Usual when it comes to Birthday, even if Thoughts are nagging at the back of his mind as they talk.]
... Ah- That's all right. I could hardly justify a celebration at a time like this. [The ironic things he says continue, considering the upcoming party for Kiseki but you know, lol.]