Krista is married to her job, and doesn't have a partner, yet. Not one from her home planet of Earth and not one from any of the other planets. As director of IRMA, the Interstellar Relocation and Mating Agency, she worries it'd be a conflict of interest . . . and highly against protocol.
Shai is banished from his home on one of Saturn's moons. The Krakonian District. Instead of death, he's chosen to be exiled to Earth, where he's placed under the care of IRMA, and the moment he meets her, all his mating instincts awaken in overdrive. Welcome to Earth.
All the Universe's guidance may point at Krista and Shai not being right for each other, but the heart wants what it wants, and Shai isn't going to give up his fated mate no matter what others try to dictate.