Alien Captain by Ariel Jade

Xaviara is a human diplomat for the Sol Alliance Coalition who’s determined to prove herself to her superiors. Nicholen is the sexy alien captain of the guard sent to escort her team to his homeworld to complete negotiations of an important treaty.
When a spaceship carrying his prince crash lands on a wild, abandoned planet terraformed centuries ago, they uncover a sinister plot that could shatter the peace. Despite rules against interspecies relationships between the diplomatic teams prior to the treaty’s signing, Xaviara finds herself drawn to Nicholen’s commanding presence.
Can they resist one another long enough to catch the saboteur and mount a rescue before the planet’s dangers turn deadly?