The Last Omega by Shane Honorae

When the orphan boy Asher loves like a little brother is outed as a werewolf, Asher abandons their human colony to find him a pack.
Humans aren’t welcome among werewolves, but it soon becomes clear Asher is something more: A hidden Omega when the pack is in desperate need of one to bear their young.
As the pack’s lone wolf-witch, Alpha wolf Sage, uses magic to keep the pack hidden and safe from humans and the dark Terrors that haunts the night. The new found Omega should belong to the Alpha, but everything about Asher makes Sage want to break the rules and challenge their pack leader for the right to mate.
He’s not the only one. The dark forces that split the world apart also seek the pack’s last Omega, and they’re willing to go through Sage to get him.
But pregnant or not, Asher is no ordinary Omega: He has powers of his ow