He couldn't even look at her. What on Earthland did she do last night? Did she shame the guild or something? She fell silent, watching Natsu with all the suspicion she could muster.

He was clearly hiding something from her. He clearly didn't want to talk to her about...whatever she did. It must have been really horrible. "... Okay." No, she didn't believe him. "I see." Not a bit, but her hand fell away. "I get it."

You don't get a damn thing, Lucy. But it was bothering her now, whatever happened, and damned if she couldn't remember what it was. Erza wouldn't be any help, since she was drunk just like Lucy was. It wasn't even so much that she had done something, but it was that she must have done something truly heinous for a reaction like that from Natsu.

She'd have to make it up to him. Somehow.