If not Ku (I do think romancing Ku would be fun though, and since Whitecrocus has made art of (an Anthro) Ku having sex with Ori, maybe he could do that?), then I think that WC should add some romanceable Giant Owl characters.
And maybe Naru.
Naru looks incredibly soft and cuddly, and it would be great to show her just how much you appreciate the role she played in raising Ori, in the most intimate way possible.
Also a love scene between Ori and Naru would be titillatingly taboo...