Although the look in Russia's eyes is dangerous, it's also appealing in that it's meant for him alone. He's seeing him, and he wants him.

He leans forward into Russia's kiss as the other nation pulls back and draws him up to his feet. As they part he sees a look on Ivan's face that he's somewhat familiar with- he'll be displeased if they don't get private soon.
But they are downtown, not in one of their homes or in an office as they usually are...
It's exciting that their reservations have dissolved so quickly, but now what?

Close by Russia's side as they quickly make their way to the door he murmurs in his ear, "could drive home, or check into a hotel. Should be one nearby." Unless he has any other ideas.