[There's a small hesitancy in his voice as he tries to figure out how to address her. Usually, he's super polite and formal with everyone, but Souji's not sure if it would help or not to address her more casually.]
... Is 'Yuuki-chan' okay?
[Also, holding someone's hand is strange. He honestly can't remember the last time he'd done such a thing with a girl. Maybe Amy had held his hand once or twice while dragging him around, but that was different. Still, it seems the right thing to do, and Souji pushes down any awkwardness to walk carefully with Yuuki next to him.]