Kevin heard what she said, but spent a few moments looking around after she let go of his hand, before he noticed that she had gone inside. So far, so good; this definitely looked like the family home in Germany she'd said she was going to take him to, not something more dangerous. Of course, he didn't really know what her family was like, maybe they would turn him in if they realized he was a Muggleborn? But maybe Shane could reason with them, or at least get him home safely?
He was probably worrying too much. Maybe it was the explosion the night before, or maybe Dean had finally started rubbing off on him. Kevin should take the advice he'd given to Dean and stop worrying.
Following her inside, he heard her offer of tea, and smiled. "Sure," he said. "Thanks." He looked around. "Have you been spending a lot of time in Germany, then?"
Was Germany under the influence of the slime juice? Kevin didn't know. He had gotten the impression that other countries might not be, but some of them might.