Oliver turned when Aizen joined them, and gave him a nod and a smile- that changed to a bit of a frown when he spoke. "Ah- sorry, I'm not sure what a matcha is-" he admitted. The touch was strange, and he found himself pulling back a little at the invasion of his personal space.
"Eh-" he decided to leave it be. People had different customs, he supposed. He cleared his throat, and smiled again.
"But, I do have Earl Grey, English Breakfast, Camomile, and Mint tea," he told them, turning over a couple of cups and waiting for their orders.