The Duke and I (Saints and Sinners Book 1) by Heather Boyd

Widowed Nicolas Westfall, the Duke of Stapleton, cannot prevent the upcoming debut for his youngest daughter no matter how much he wishes her eventual marriage wouldn’t leave him all alone. Convinced to host a Christmas Ball to prepare her for the season, he’s aware he’s considered a catch on the marriage mart too, but Nicolas is drawn to companion Gillian Thorpe instead. 

Gillian was hired to prepare the duke’s daughter for her first season, but its not easy when the girl hasn’t the least interest in the men and the widowed father makes her knees weak when he laughs with her. Gillian respects and admires (perhaps too frequently) the Duke of Stapleton and when she’s lured into a mistletoe kiss with him, will she be able to stop at one or even want to? 

A steamy regency romance.

Saints and Sinners Series: 
Book 1: The Duke and I (Nicolas and Gillian)
Book 2: A Gentleman’s Vow (Gideon and Jessica)
Book 3: An Earl of Her Own (Adam and Rebecca)
Book 4: The Lady Tamed