Spock sat when the others sat. His eyes watched Irina closely as Perry was brought outside and he wished deeply that he could take away those feelings of sadness he knew that she was feeling. For some reason, he had a strong urge to hold her in his arms.
Patiently waiting for an apropriate moment to excuse himself. During a lull in the conversation he found one.
"Irina, thank you for the lovely conversation and introducing me to this shop. I will be frequenting it when I am in the neighborhood but please, let me allow you to catch up with your siblings? Its rude of me to stay. I get to enjoy your company more often then they do." He said placing the money (for his and her beverages) on the table.