Unpredictable Fate by Jessamyn Kingley

Chieftain Kalthekor Valzadari is an elf with many regrets. Once a man concerned only with what would bring glory to his tribe at the expense of people he should’ve protected, everything changes when his son is born. Trapped in a loveless matebond, Kalthekor wants to leave his old life behind, but he is bound for eternity. Still, he can’t help but wish for freedom and a relationship as rich in joy as those around him.
Although Aristos Centaurus is brother to the leader of the Centaurs, he is unable to forgive or forget that he once spent centuries committing inexcusable acts of war. With so much blood on his hands, he cannot ignore that he should have been sentenced to death. Aris might help the centaurs now, but he keeps his distance, knowing better than to befriend any of his brethren. He doesn’t deserve happiness or love, but he yearns for it nonetheless.
A misunderstanding sends Aris from the isolation of his brother’s house to Council Headquarters, where he finds himself staring into Kalthekor’s blue eyes. After an instant connection, both are ready to have a partner, and believe they can find what they need in each other. As the pair build a life and a home together, Kalthekor and Aristos realize that although they have created a wonderful foundation based on friendship and love, if they are to move forward as a family, they must find a way to face and reconcile their pasts. Only fate knows if it will tear them apart or if a blissful future awaits them.