Angels and Ashes (Heaven's Rejects MC 2) by Avelyn Paige

He's the scorned president of the Heaven's Rejects. She's the widow of his best friend and former vice president. He shouldn't want her, but he'll move heaven and Earth to have her.

Left alone as a new widow to raise her family, Darcy Kyle's life has spiraled out of control. When secrets about her husband's past emerge, she is forced to confront the fact that her husband's fatal accident may, in fact, have been deliberate. Forced to sell her soul to the devil himself, Darcy must uncover the truth of her husband's accident...before it's too late.
Cast into hell, Raze has given his life as the president of the Heaven's Rejects, but what good is it when he can't protect the people he cares about? His brother's death, his wife's betrayal...it's too much for a mere mortal to handle. Luckily for Raze, he is the ruler of this hell on Earth. But even the Devil has a weakness, and when Darcy Kyle sticks her nose in the club's business, he finds himself questioning his loyalty to his brother's memory.
How can the devil resist an angel bathed in the ashes of the fallen?