Teach Me Under the Mistletoe

Caroline "Kitty" Tyndall is tired of being overlooked, considered a child by the man she desires. He likes worldly, more experienced women – something she's not. So she convinces the new groom, Hugh McCollum, to teach her how to kiss the way a man likes to be kissed...
All kinds of trouble could result from young Lady Caroline's request to teach her how to kiss. But Hugh had never been one to run from trouble... or a challenge. Besides, if no one found out, nothing would come of it, and it might prove an enjoyable distraction.

After all, he was only supposed to teach her how to kiss.