Making Their Vows by Lucy Darling

Truly Adams won’t spend another day in a loveless marriage. She knew it was a marriage of convenience, but she hoped that maybe it would evolve into more than that. Blake always acted differently toward her than he did the rest of the world. He wasn’t cold and dismissive to Truly, not until after they said “I do.” That might have been the plan all along to get her to agree.

Blake Lockheart is counting down the days until he can finally have back the only woman he has and will only ever love. Except that day came a week early with her bursting into his office with divorce papers in hand. He made a deal with the devil to have her. There isn’t a chance in hell he’ll ever let Truly go. Even if it requires blackmail, he doesn’t care. Now he’ll become the devil if he has to. Because she was always meant to be Truly his.

This series is dedicated to timeless love stories. It’s got all the tropes you desire, with all of my usual over-the-top alphas and sweetness.