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Amazon:
Isolde's Wish by Em Petrova, her standalone f/m historical-ish medieval-ish probably-fantasy/folklore-tinged (is it just me, or should her beau really ought to have the name of "Tristan" if there's a "sleeping-with-the-king's-wife" backstory element in there?) probably-erotic romance novella. This appears to be self-pub, but Petrova is a regular Samhain and Loose ID author.
Warning: Love scenes so hot it could float a steamship!
With a wild boar on her heels and a naked man before her, Princess Isolde has no clue which danger is greater. When she trips and falls into the dirt at the feet of the axe-wielding warrior, giving her a very close encounter with his manhood, she battles her undeniable awareness of the sculpted man even after she finds he has a price on his head for attempting to assassinate her father, King Adlard.
The bold son of the man executed for sleeping with the king’s wife, Sadler attempted to avenge his father at a very young age. Now he’s faced with the temptation of King Adlard’s daughter and presented a fresh opportunity to right his failed assassination attempt.
But when he learns a powerful earl seeks the princess’s hand in marriage, Sadler realizes his passions run deep. Desperate to keep her from the arms of his enemy, he plans to steal her away from the kingdom and make her his own.