Cursed of Frost by Maggie Hemlock

Omega vampire, Scott Hemlock-Knight has always felt a bit overlooked in his family. His studies of hearth magic have been mocked long enough that he’s used to it, but when a family member takes the joke too far, he flees to Heartville for some peace of mind. Except, peace isn’t what fate has in store for him.
Alpha Terrick wakes outside the Other World gateway of Heartville in a new form with no memories of what came before. He’s more lost than ever when he picks up the scent of his true-mate. He doesn’t know where he came from or how he arrived in Heartville, but he’ll do whatever it takes to stay with Scott now that he’s found him.
Will love and grit be enough to overcome magic almost as old as the true-mate bond itself?