Oh, she notices that frown.

She notices a lot of things.

Putting her current project aside (she was only wiping down the counter anyway), she leans her hands on the bar and gives him a knowing smile.

"Long enough to know when someone isn't completely satisfied with their order."

She doesn't sound the least bit angry. In fact, she turns thoughtful a second later, giving the cup of cocoa a careful look.

"Something's missing, isn't it?"