Putting aside differences… In truth, that began before Reiner arrived in this world. It began when his war was lost, and their war began. But things had been different here. The peace established wasn't by necessity: it was by choice.

He meets Cater's eyes, something in his own gaze softening. "I'm sure Erwin will appreciate that. And more than just him."

Reiner doesn't go into the details. Doesn't mention how this place was likely a longtime dream made reality. Doesn't explain that it couldn't possibly have existed where they came from, thanks to Erwin and Levi's responsibilities and positions. He just smiles a little, grateful.

Then he adds, "Manning the place with just two people must be tough. I can probably give you some more help around here, after I talk to Erwin."

Especially since, as Reiner understands it, both Cater and Natsume are new to the job.