Halfbreeds. Real World, #1

Lonely and rejected, Natalie Woods knows her mother doesn't want her. Bullied by her brothers, she turns to the only person who seems to care: her late father's best friend. Scott Carling knows Natalie is his mate, but he can't tell her until she's old enough to understand he's not a part of the human world, but something else entirely. The two begin a passionate affair when Natalie is still only fifteen, but after witnessing a violent confrontation between Scott and her mother, Natalie runs away. Tracking down his mate took Scott years.
Now he's found her and he's determined to get her back. He won't let anyone or anything stand in his way.