[ It stays in his ears too - the mark of sloppy illusion work, or unintentional, in this case. ]

Oh. [ He sounds disappointed and slightly stressed out by the answer. ] Are you sure you're hearing it too, then? Of course you are, you're the one who brought it up. It's just - I think I've been seeing things that aren't there, but it was difficult to tell when I was by myself.

[ He reaches up to brush his hair out of his face nervously, and Riku might catch a glimpse of a small mark on his hand, centered around what looks like a mosquito bite. ]