This doesn't have a harem tag, even though it's been completed ages ago. I kind of hope it stays that way, but I am not sure how that would work considering it was essentially announced in the manga that it would be a harem story
I'm not exactly sure why his ears of powers though? Is it because she licked them? But then why would they have power enough that she wanted to lick them in the first place? And apparently his ears stank so good that the cat girl noticed, why did no one notice before?