When He’s Sinful by Suzanne Wright 

Aspen Montgomery was nine-years-old when she befriended Camden Priest—a boy with dead eyes and dark urges. Since that day, they’d been inseparable. She hadn’t expected to later develop a major crush on him. Or expected that the crush would fail to pass. Or ever thought that she’d grow to wish that she could one day claim him as her mate. It’s never going to happen. She knows that. To him, she’s a friend, nothing more. So it’s time to make some changes to establish some better boundaries. Which would be a hell of a lot easier if he didn’t fight her on it… Read more.