In common:"Wait...you speak human words too? I learned how to speak like this...a long time ago. I barely remember. Why didn't you say so earlier!" Wing visibly cheers up at finally being able to communicate with you. "Well, I'm wing! I'm a protector! That's what I do! I protect things! Right now, I'm protecting Zillia. She's very nice. And pretty! What are you doing? You are...Star...Man...right? Zillia told me your name. What does it mean? Isn't what you call a star...those things way way way up there? Is that why you fly on the big animal?"
Wing has all the fervour of a small child who's been fed too much sugar.
Sorry! Pixies speak common as default! You never spoke to it in common, you tried Druidic, and then hammering out some words in Sylvan. He had no idea you spoke it either. It was too cruel, I know, I know, but I didn't want to push you. And frankly, I thought the communication barrier was hilarious, especially considering he was invisible. You couldn't really tell what he was, anyway. Sorry!