Tempted by the Alien Barbarian (Warriors or Warden, #6)

Twins, Abby and Arya have always had a special connection. When they prove to be unable to be computer-matched to mates The Powers That Be, try to force them to marry men who are under their control. Desperate for a way out, they negotiate their way off the planet by hitching a ride with two handsome strangers.
With most of his brothers having taken wives, Shn is starting to feel the chill of loneliness. So when, on the brink of war with Earth, Shn and Thm are sent on a recon mission to the...