Enforcer by Cyndi Friberg

Alyssa, a reluctant spy and hacker, comes to Lunar Nine hoping to disrupt their computerized systems and slow down the mysterious transformation program. She's brilliant when it comes to coding, but helpless against the overwhelming attraction she feels for Dakar Lux, one of her potential mates.
As senior enforcer, Dakar is responsible for the safety of every person on Lunar Nine. He senses danger and deception in his lovely potential mate, yet he can't stop thinking about her. He has always believed in keeping his enemies close, so he courts her, seduces her, determined to learn her secrets while he slowly stakes his claim.
Note to Readers: This book contains detailed descriptions of sizzling passion only suitable for mature readers.
From Cyndi: Battle Born is a fully integrated sci-fi series. Each romance is resolved within the given book, but many plot elements continue on from story to story. For this reason, it's best to read the books in order. Enjoy!