The Break of Civilisation - The Restoration Legends, #1

On a post-apocalyptic colony world an orbiting AI, styling itself as their Goddess, breeds a remnant population of its builders to find a host for its consciousness and save the planet. Prime candidate Willard Forrestor has other plans, and oathes to Kezia Leach against the AI's plan to breed him to her sister Averil Leach. Both sisters reject the AI's breeding plan but when Kezia disappears and Willard gets blamed, he sets out to find her and clear his name.
The AI, its adherents and its enemies constantly hamper his search. Willard and Kezia reunite on the eve of invasion and to save Kezia's life Willard gives in, and submits to hosting the AI.