Levi's fussiness doesn't extend to shirking on cleaning duty. Erwin knows this, and accepts it. He'll be hauling water one-armed all day tomorrow.

Erwin has, very pragmatically, decided not to think about what they'd have been doing today back home. They'd be retaking Shiganshina and riding straight into the mouth of hell; instead, they're in a treehouse after seeing an ocean with black sand and finding a hairy rock. This is, while not what they're supposed to be doing, much better and more interesting, and Erwin is going to lean into that.

"Of course." Erwin gives Levi a gentle shove when he steps away. "You go wash up, and I'll get some water boiling."