Night By Night by Tymber Dalton

Hank never expected to be a single dad to his young niece, JJ, but he’ll do anything to keep her safe. Finally able to move back to Sarasota, he quickly reconnects with his old best friend, Maddox. Dox always had his back in high school, and he never had a better friend.
Maddox secretly crushed on Hank. Except they haven’t seen each other since high school, and he never confessed to Hank that he was bi. Maddox is also a Dom, but the last thing he wants to do is alienate his best friend now that Hank’s back in his life.
When Hank’s world literally caves in, nearly taking him and JJ with it, Maddox steps in and takes over, moving them in with him. And when the hits to Hank’s world keep coming, nearly crushing him by threatening JJ’s life, Maddox proposes a marriage of…convenience. But can he convince Hank it means far more to him than that?