You're getting that... [ he makes a hand gesture, remembers Shiro isn't in the room and can't see it, drops his hand ] crackle in your voice again. Thought it was just the communications array reacting poorly to...demonic energy, but when you looked in here too long, it made your voice sound strange, as it did before.

So, maybe it was exposure. Or just hearing a demon's words. Either way...looks like it stayed with you a little.