Heir of the Coven by Amelia Shaw

As a witch with the most powerful genetics in the known magical Universe, Ava has a choice: do the Council’s bidding…or risk their wrath.

Ava Melfi has had enough of hiding, of pretending she doesn’t exist. She’s the daughter of a powerful Witch and the most well-known Warlock in the Magical realms, and its time everyone knew it.
But the Council wants to charge Ava with treason against the High Warlock. And if they win the case, it’ll mean the end of her life.
After a grueling trial with her Fae lover at her side, Ava is accepted as the illegitimate daughter of the High Warlock and given the power of the Heir to the Covens.
The catch, however, is she must relinquish all control of her life, and the choice of her future husband, leaving her fighting for her life…and for the life of the man who’s sworn to die by her side.