Primal domination: Sci-fi alien romance

When Earth becomes barren, wars are waged between two species. Humans and the Drexicons.

No one remembers when the Drexicons came, or why they did.

The only thing humans know is they never left

The last of the humans are driven to survive on a boat known as the beacon

A prophecy is told. It will save the humans and Drexicons, uniting them as one

One human female and one Drexicon male will bore a child to save them all.

One magic child

The humans agreed to auction off their fertile females, in exchange for compensation

This is a stand alone science fiction romance. No cliffhangers, no cheating, HEA happily-ever-after ending included.