[Oh hell, the brat had a pretty girl with him? His expression drops into a more annoyed one too, actually. Now he looks bad in front of a girl, just great... he'd excuse himself but somehow he feels the need to save face because of it.]

Not really, ma'am. Are you?

[And then Shuu starts trying to misrepresent the situation even further, and it's incredibly hard to tamp down his growing agitation.]

Oi oi, you're the one mixing it up, aren't you?! I was just doing my shopping when you asked me a question and got all insulting cause I gave you an answer you didn't like... I'm not gonna thumbs up your mountain of candy when I'm studying to be a freaking doctor. And stop calling me oji-san!