[Honestly? He did not think any impersonation of Naruto could be worse than actual Naruto. He didn't think any impersonation could be this bad. It's no fault of Momo, he knows this, not when Momo has never met Naruto.

But it's bad.

He doesn't know whether... to defend his friend's honor or laugh about how fitting it is for said honor to be sullied. Reaching back, Sasuke grabs a fist full of the blanket and pulls it off, quickly dumping it over the top of Momo's head so he a) won't have to show Momo any kind of amused smile, and b) won't be able to clearly hear any more awful, awful imitations of Naruto.]

I've already dealt with an imposter usuratonkachi once before. I can see another a mile away. Impersonating a Hokage is a high offense. I won't hesitate to punish you.