That's damn unlikely. First of all, there's no suggestion of the advanced version for this particular job in any of source material, aside from readers' imagination. Second, every time MC buys a new slave, the trader makes it a strong selling point that "You may shag her as much as you please...
"Watsonian vs Doylist perspective" - one is about reasons and explanations that characters in their world can understand, another takes into account what happens in the world of the author and the audience. That is, to the question "Why did Sherlock Holmes die in the Reichenbach Fall, a...
Later in LN, Cassandra the elven elder mentions her marriage with her human husband being childless, and that spoiler spoiler should be a good option despite being childless as well.
Master Smith class has Lvl 10 Item Box (not depending on level, like Explorer). Other girls' Jobs can't have it.
In LN he actually asks about eating raw fish, and yes, they get mildly offended by it. He didn't try to teach them about sashimi.
I'd say the shape plays a bigger role than the amount of fur, which may look a lot but it isn't really stuffing the ear canal. Just watch a real cat twitching their ears at a slightest sound. I'm sure she's doing fine.
Interestingly that in chapters where she goes fishing, she's specifically warned not to dive in the water because of monsters and only use fishing gear. Nobody swims in that world.
If the latest chapter is any indication... we better wait for whatever snail pace manga updates, because the anime based on the source material alone won't be nearly this good.