On the Third Sexy Day... (Five Sexy Days of Christmas #3)
Olivia Hawthorne

She wasn't looking forward to the holidays, until, that is, she met Sebastian Connors.
Sebastian was the neighborhood bad boy that every good girl secretly wanted. Home to visit his family for the holidays, he convinces Cassie to let go of her prim and proper ways to spend five sexy days of Christmas at his side.
Each new day brings a present that is hotter than the last.
On the Third Sexy Day...is book three of a five book holiday series.