Bound To The Barbarian by Carol Townend
Sold into slavery, maidservant Katerina promised one day to repay the princess who rescued her. Now that time has come, and Katerina must convince commanding warrior Ashfirth Saxon that she is her royal mistress. Spending balmy days and long sultry nights with this man make Katerina's task increasingly impossible. How long will she be able to keep up her deception? And how long before she finds herself willingly bedded by this proud barbarian?