Emperor of Fates by Tammy Andresen

She chose the wrong duke.
He’s a rake,
a rogue,
and the father of her unborn baby…

Lady Caroline Green has a secret. Her dead husband, the Earl of Green, thirty years her senior when they wed, never consummated their marriage.
If society knew the truth, she’d be stripped of not only her position, but the inheritance her husband left her.
Which is why she decides to rid of herself of her virginity as quickly as possible. But perhaps the Duke of Strongborn was not the best man for the job.

Sinfully handsome and magnetic, he draws Caroline into a night of passion, that feels like fate.
Until her one transgression has unintended consequence. She’s pregnant with his child.
Now he’s everywhere she is all the time. At dinner parties, outings in the park, her bedchamber during her baths.
But the thing she wants most is the one thing he won’t give.
His heart.
He’s the Emperor of Fates. Surely this was meant to be…