"What?"
Eponine is momentarily stumped, but recovers quickly enough. "Oh yes. Balls. All the time. Every week. That's why I dressed down for such a little affair. It does not do to be too showy, does it?"

She's dying to laugh - but she's keeping a straight face for now.

"Perhaps you should attend. We only allow the richest, most beautiful people in, though. Would you pass, do you think?"

As Marius turns, Eponine has a little giggle to herself, before straightening her face, and acknowledging the wine with a little bow of her head. Then she takes a sip - and the charade slips.

"Oh M'sieur - it's delicious. Try it. So long I have wanted wine. And never - not for years and years. Oh try it, M'sieur."

She drinks another sip, and another and another until the glass is half empty. And then she remembers the charade.