[If he catches himself - and he almost does, surprised at himself for just a moment - it's Shiro's response that kind of just. Okay. He didn't think it was weird. It's fine.]
[He laughs a little there, a huff, not quite trusting himself to look up at Shiro still for now.]
I'm not singing. [Though he's been known to, when he thinks no one is there to hear.......]