The Prince's Captive Virgin (Once Upon a Seduction..., Book 1) by Maisey Yates
Innocent in the beast's bed!
When Belle Chamberlain offers to take her father's place as his prisoner, Prince Adam Katsaros strikes a deal. Deeply scarred by the accident that claimed his wife, Adam isolated himself in his forbidding castle. But Belle's innocent beauty could redeem his reputation as he reclaims his throne... He'll release her father if Belle poses as his mistress!
Belle can neither deny nor resist her brooding captor! Adam's burning gaze awakens a new-found desire, and every touch brands Belle as his. His ruthlessness is legendary, unless Belle can tame the beast inside...