Highlander’s Wounded Beast by Alisa Adams

An oblivious man. An order from the King. A love that can never be.

Ina is the youngest of the four Ross sisters and seems to be the only one who has not found her happily ever after yet. She is the most petite of the four, but a fierce rider and warrior, and intimidates all men who want to marry her.
One day, a very handsome young Prince on a magnificent white stallion comes to the castle with orders from the King to marry young Ina, and everyone thinks that she has found her very own fairy tale.
But no. Ina cannot stand him.

She instead falls for a huge man named Beiste who came on a tired looking horse, clothes in tatters, and he has lost his memory! Even if he was wounded, before falling unconscious, he asked her to take care of his horse and nothing for himself. Ina had never met such a selfless man before.
Being one of a kind herself too, her rebellious character pushes her to act reckless and try to escape her fate. Life is no fairy tale though, so she gets in deadly danger.
When all hope seems lost the mysterious stranger will wake up from oblivion and any man standing in his way will have to flee.
But even so, Ina is ordered to marry the young Prince, and no man can defy the orders of the King.

It will take a Beast to do that.