Cute and interesting. I also liked the idea of human ears shifting into animal ears, I find it much more believable than another pair of ears just popping on someone`s head. And that bit about Iori choosing trousers with a hole of a correct size for Riku`s tail is fascinating (and hilarious). I just wish it had at least one more chapter to tie in the loose ends, e. g. their meeting in the past, Riku`s wedding, some snippets from their family life and how it probably wasn`t easy to form a family in a world with prejudices.
Sekai wa Shippo de Dekiteiru