The Scorpion’s Mate by Susan Trombley

The Scorpion’s Mate
Claire has never really fit in with everyone around her, but she’s carved out a life for herself using her own unique style and artistic ability to support herself on the Internet. The last thing she expects is to be abducted by aliens and dropped into a research facility, where a genetically-engineered alien soldier chooses her as his life-mate.
Thrax’s pheromones are compelling, and his status as a fellow unwilling test subject makes them allies, but Claire isn’t certain she can trust someone who is convinced she belongs to him, when all she wants to do is find a way to return home to Earth—a place that her devoted alien can never follow, because there’s no way the scorpion-like alien would ever be able to pass for human.
Still, she’ll accept help where she can find it, so she doesn’t hesitate to escape with Thrax from the facility, though their time running from their pursuers in the warrens beneath the research facility will forever change Claire, and could make it impossible for her to return to Earth.
But will there be anywhere else in the galaxy they can go where their love will be accepted?