By the way - why is there no crossed-arms tag or something like that?

Possible Kirinrin joke (although not in the commentary it seems)?

I knew it that kirino sorta looked like Rin

technically kinda acts like her too. XD

Artist's commentary:
Kyosuke："Ahh... If you're going to become Kagamine Rin, don't make that sort of expression... =_,="
Kirino："Shut up, shut up, shut up, shut up...!"