Caden by Serena Simpson

Life happened, but that didn’t mean Sage had to be happy about it. Her ex-boyfriend was chasing her, to make her a human sacrifice. He thought it was a game, one she didn’t want to play.
When Caden met Sage, he knew his life was about to change. He would do anything to have her, but more importantly; he would do anything to save her. There was an unknown alien entity that wanted her dead to open a doorway. He wasn’t about to let that happen; she was his mate.
Neither of them knew how deep this ran or that it had been in the making for years. Now they were searching for a way to escape the oncoming game because time was running out, and Sage’s life was the prize.