Bind the Alpha - Mercy Knott

https://www.goodreads.com/book/show/231730839-bind-the-alpha

An exiled angel. A silver-tongued demon. A wish that binds them together… and a daughter too magical to be allowed to exist.Solriel was never meant to rule alone. Banished to the edge of the demon wilds with his daughter and a crumbling castle, the disgraced Omega angel keeps deadly secrets buried—about his past, about her dangerous heritage, and about the burning grief that still flickers beneath his golden light.

But when a fox demon crashes from the sky in a blaze of orange flame, everything changes. Reyn is flirtatious, infuriating, and far too clever for his own good. Worse—he might just be the answer to Nova's innocent wish for a friend. Or her complete undoing.

Bound by magic neither understands, enemies become reluctant allies. As Solriel's carefully constructed world crumbles, he must Is Reyn a threat to everything he's sworn to protect, or the first person who's ever seen him as more than a broken angel?

But demons lie. Angels fall. And wishes always demand payment.