Bear Brother by Kyrii Rayne

When the shifter you thought was a monster becomes family and the human you thought was a friend turns on you, how do you keep everyone safe?
Billionaire heir and bear shifter Jake Matson has bonded with his true mate, Anna Moretti, in spite of the machinations of his demented, human-hating father. But as they and their tech genius friend Darrin help the Bear Lodge leader, Helga, clean up his now-deceased father’s mess, they are presented with something that they didn’t expect. Traumatized, brainwashed half-bear Graypaw, Jake’s half-brother and the subject of his father’s most heinous experiments, has been in Helga’s care for a month. He has gone from a violent, confused beast who was taught to view humans as prey, to a shyly curious novice at life who longs to connect with his human side. Now, Helga asks Jake, Anna and Darrin to help her teach Graypaw to do just that.
It’s a frightening idea – can they trust that Graypaw has truly changed, that their lives are not at risk from him?
As Graypaw changes and grows, Anna and Jake find themselves more and more seeing him as family, not as the monster he once was – but when Graypaw is compellingly drawn to a scent in the forest, everything he has learnt about relating to others, to humans, is tested. To save Gray, Jake, Anna and their friends must put their faith in a complete stranger, whose response will decide not only his survival, but the fate of his heart.
Has Graypaw reverted to the dangerous beast he once was? Can Jake, Anna and Helga find him in time to save him from himself? Can they trust the human who was also a subject of Jake’s father’s atrocities, or will he turn on them – and Graypaw? Has Graypaw truly scented the mate destined for him? Or will his actions destroy not only him, but the entire bear shifter community?