Responses

It's an arranged marriage.
It's explained that humans have evolved so they technically aren't actually "human" anymore.
It's being theorized that Makami is the small wolf kid from the flashback. The nice clothes, fur pattern and species match. That and the way Makami is acting-- like he wants to cherish Kai more instead of just getting right to the baby making-- gives "the small kid who was once protected returns to be with the person who protected them" vibes.
I don't get it. He is a pure human, how can he get pregnant?
when did they got married?
is the wolf the friend that was holding his hand?