Respect to the teacher. I'd hate it if my cat went and turned into a human. I got a cat because I wanted a cat, if I wanted to talk to humans, I go outside.
i wish they could make the doujin canon, and give it an end like inari konkon koi iroha , where the mc got with the god and became a god with her, while his sister stayed on earth and lived a mortal life.
it would fit perfectly, if the brother got the powers of the 'head'