Her Rough Ride (Sharing the Princess #1)
Anna Cromwell

The Princess finds him too gruff at first, but his virility soon proves irresistible – and she finds herself falling victim to the innate arousal , where curiosity and lewd desires get the better of her.
She's going to find out if the rumors of his well-endowed manhood are true... and he's all too happy to oblige. And he's not being paid to pull out...
But what will her new husband think if he ever discovers the forbidden act of betrayal?
Book one of the Sharing the Princess series.