This isn't something you guys have to follow but this is something that will be canon for the world.

For a while I was trying to figure out on why the government would allow Volatikai to have relationships with humans but not have offspring, and then I thought of something kinda "evil". Maybe not entirely, but I like this idea. xD

If a Volatikai is to be in a relationship with a human, it is by law that they be neutered/spayed even if they don't plan to mate. It is a felony not to have this done when they have been together for more than a month. This is only done to Volatikai because the gov't is biased and cares more about humans.
I don't know yet if they wouldn't care if it's same sex relationships. Maybe not, unless they wanted to be more evil.

I'll still figure out the fines and/or prison time that can happen from breaking this law.

BUT YEAH if this is something interesting for you, feel free to put it into your own story.