Levi's little system for the cat only serves to convince Erwin that he actually likes her, and doesn't mind having her around. If nothing else, the mimic has been cowed into staying in the hermit crab enclosure, so there haven't been any random bites lately.

"Someone very hungry, I imagine." Maybe they saw something else eating the oysters first? Erwin isn't sure how anyone would realise they were food without that kind of cue.

He chuckles and returns Levi's kiss. "All right. He showed up oysters and mussels, we should think of something unique from our world. How do you think he'd feel about my mother's apple cake?"