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Mori's upset by Ghost Cat sniffing her butt, but that's actually a sign they're getting more acclimated to each other and probably why we haven't heard anything about them hissing at or fighting each other in a while. Though on the other hand, it's also possible that it's also the behavior boy cats do to check if the girl cat is ready to mate, so Mori better take care of that sooner rather than later.