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Er...
She glanced from the grape juice to Kazuma, then back at the grape juice. He knew fairly well that she was too old to be treated like a kid! She could most certainly handle her alcohol! Maybe!
If he were one of her friends back home, she would have insisted upon having wine. But she was a first-time guest in his home, so she decided to be polite. Resigning herself to her lot, Remy reached for the grape juice.
I'll need to chop it down for the widget, but you need to read the whole thing to really get why it's so funny. Poor Remy!