First of all, thank you for playing the game ♥!
The Bi/straight choice, will actually be updated (either later or this coming update) to have a "full bi" choice.
Katana of Arkaria doesn't come from the beasts.
It's merely in the possession of the beasts.
With shuria, you know very well what she meant by that, but it would be a funny option to add, but I wouldn't treat that moment other than it was.
It is not only the maid.
On the beast side there is a side quest where you go with Leine to a premium escort type-esque services house.
There are 3 Female options and 2 Male options.
And Vorax will be a romance option later down the line.
Hope you enjoy of what god's call has to offer, can't wait to deliver more!