Captured By the Alien by Lilah T. Bane

Captured. Imprisoned. And forced into an alien marriage contest.

Kara never imagined she’d fall for an alien warrior. Vahn is supposed to be her mortal enemy, not her fated mate. But the big, gruff Vraxian sets her senses on fire and makes her question everything she knows.
That’s until she learns the secret he’s been keeping from her. To say she’s furious is an understatement. And when she’s forced to pretend to be his prisoner, things go from bad to worse.
Taken captive and transported to Vraxos, Kara must hide her feelings for Vahn in order to survive. The war between their species means their love is forbidden. And that’s not all.
There’s the small matter of the dozen Vraxian females competing ferociously against each other for the privilege of marrying her mate. Yeah, like she’s ever going to let that happen.
Kara’s a soldier. And soldiers don’t back down from a fight. Especially when the prize is the seven-foot alien who owns her heart.

Captured By The Alien is Book 2 in the Starbound series: a steamy sci-fi enemies-to-lovers romance with a kick-ass human heroine, a few laughs and a lot of action. Oh, and a hot alien warrior with pseudo-tentacles.