On the Ridge by Jayda Marx

Zane and his dad Grayson became the laughing stock of the town when they claimed to have seen something incredible during a walk in the woods – a mountain lion which changed into a human. After years of ridicule and harassment and having everyone they cared about turn their backs on them, they moved to a remote cabin in the woods, where they searched tirelessly (and fruitlessly) for the creature.
Now Grayson is sick and running out of time. He has one final wish; to see the creature once more to prove to himself that he isn’t crazy. Zane heads into the forest, desperate to locate the animal and grant his father’s desire, but only finds himself in trouble.
Ridge is drawn beyond the borders of his pack lands when he hears a cry for help, and soon finds his mate in peril. After a case of misunderstanding and mistaken identity, Ridge gives Zane his claiming bite in order to save his life. He’s expecting a greeting of love and excitement when Zane heals and regains consciousness, but all he receives is an extremely confused and terrified mate.