Richter Scale by Dalia Davies

Tell me you wouldn’t leave Earth behind for the promise of a utopian life with an alien mate.
I dare you.
The Agency plays matchmaker for women willing to travel across two galaxies to a planet in desperate need of them.
Too bad I had to sell my soul to get on that ship.
When the Sian envoy arrived on Earth willing to trade almost anything for the one thing they need, I knew I wanted an alien of my own, and Richter… he’s perfect.
The Agency has requirements I couldn’t meet without help, and the organization that falsified my records wants information in return.
Those records might be the reason Richter isn’t the accountant I’d been matched with. If he was, I’d have been able to bore my handler back on Earth until they gave up on me. Instead, he’s a part of the Shadow Zone Brotherhood.
The paramilitary group tasked with protecting their world from the monstrous creatures that wiped out the female population three decades ago has plenty of secrets I could send back through the comm channels.

And even though he wasn’t supposed to be mine, now that the bond’s in place, no one can take him away from me.
The man who should have been my mate is determined to try.