Kidnapping Casey (2010) is the second installment in Laurann Dohner's Zorn Warriors series. The Zorn are aliens (as in another planet).
Argernon, brother of Ral from Ral's Woman, is visiting Earth to learn more about the planet. He saves Casey from a couple of deputies in the woods by her house.
She originally thinks he's Sasquatch, a legend come to life, and wonders if she can find a way to keep him. Instead, he takes her to his spaceship, planning to keep her.
If you're looking for romance with a science fiction component, and plenty of sex, all in a quick read, the Zorn Warriors series might work well for you.
So far, there are four books in the series, and I'm certain to read, and blog about, the two most recent entries at some point. For now, you can learn more at the author's site here.
My overall personal rating of Kidnapping Casey is a B-.