It's true, Levi does have a talent for letting Erwin chatter at him to think out loud, listening with one ear for any bullshit ideas and countering them. He doesn't always need to understand the details of whatever problem Erwin's working through, although he can come up with a decent strategy on his own, if pressed. But his particular talents lie more in adaptability, reacting in the moment.

It's the pause that pulls him out of his unfocused (or perhaps too-focused) stare, when Erwin finally takes a drink. A pleasurable little warmth unfurls in his chest at the praise and the smile, and Levi shifts a bit on his feet, chin lifting a little to soak it in, pleased that his efforts seem to be paying off.

"Yeah. S'just a mild black with a few walnut pieces in the cup." Nothing particularly elaborate. He's not going to go crazy with the wild blends, but experimenting a little didn't hurt.

He pauses, head tilting a little, unsure. "Is the balance right? You put a fuckload of sugar in that beanwater, but this doesn't taste like shit to start, so..."