Lithuania and Belarus walked through the street on their way to buy food for the day. Belarus seemed very uncomfortable indeed and as a result, was shrinking against the wall, avoiding contact with Lithuania. He stopped and looked at her with concern, stretching his hand out.
"Hold my hand. We are a married couple, after all."
Belarus simply glared threateningly at him without responding to his request until he gave up, withdrawing his hand. The two of them continued on, approaching the bakery.
Lithuania entered the bakery by himself, as Belarus stood outside waiting. She couldn't understand a word he was saying to the baker, which made her feel uneasy.
When she was part of the Polish-Lithuanian Commonwealth, Poland had taught her how to speak his language yet she never really got around to learning Lithuanian properly. She only knew a few basic words such as 'hello' and 'goodbye', so instead, it was often Lithuania having to talk to her in Polish or Russian.
Lithuania exited the bakery, holding a single loaf of bread. He grabbed Belarus' hand without a word and she flinched, trying to break free. There was a 'snap' as she did so, and she hoped it wasn't her own fingers that had made the noise.
The two of them then walked to the fishmonger's. This time, Belarus was forced to accompany Lithuania inside. The smell of fish guts made her wrinkle her nose in disgust and she stared at the burly man slicing fish and spilling blood on to the cutting board.
Again, Lithuania spoke to the man in words she couldn't understand, before he collected his purchase.
"Why do we always go shopping at your place?" Belarus asked, on the way home.
"Sorry if you didn't really like it here, but it wasn't always this boring. It's just that so many people have been leaving recently and I don't always know where they go...maybe next time we can go to your place?"
"You'd better remember..." Belarus hissed, linking hands with him and squeezing tightly. "I won't let go until you swear."
Sorry if there are any inaccuracies. From what I heard, the Lithuanian-speaking population in Vilnius during the early twentieth century was only a small minority, so there's an inconsistency right there.
Then again, you could also think of it as Lithuania choosing to specifically visit places where he can still speak his native language, so that he doesn't end up forgetting it completely.