Yuri nods once, short and firm. At the same time, there's a slight shift of his shoulders, squaring his posture -- as if he's responding to some outside criticism, unheard by anyone but him.

'I never sent your parents a thank-you note for letting me stay at your place,' he says, and his expression has turned serious again. A little less intensely focused than the one he'd had while watching the chopsticks demonstration, but not by much. 'So I need your address.'

It's amazing how much disapproval Nikolai Plisetsky's furrowed brow and silent pause had been able to convey, when Yuri had hesitated before admitting that he had left Hasetsu without thanking the Katsukis for their hospitality. It had been enough to immediately impress upon Yuri exactly how nekulturny he had been -- and how badly it reflected on his upbringing at the same time. So he had promised, naturally, to rectify matters as soon as possible...and as luck would have it, rather than his planned roundabout approach of asking Yuuko for the address, getting it now directly from the source will save the trouble of having it arrive without warning, or explanation.

(No matter what Katsudon might say in response, he knows that there's only one right thing to do.)