Apollo chuckled at the twin's brief exchange before returning to his drink, he muttered something to Pollux which probably had to do with Castor and Syrinx.
The one finger calling for her to wait was easily understood, honestly she preferred that communication- each part of the body spoke out its own language (voice remained for music only).
The nymph was pleasantly oblivious, two seemed fine and again the approving smile appeared on her features. She nodded watching the bartender take their order and reappear after a brief pause with the bottle and glasses - he was doing something now- pouring out just a little bit for Castor's approval before pouring out the wine for both.