" that Lady Herrick has a birthmark in the shape of a butterfly on her left buttock. Oh, and that said birthmark turns an interesting shade of lavender when slapped.” Apollo stopped in the hallway outside the breakfast room and simply stared at his companion. “What?” Montgomery looked irritated. “I defy any man to not take the opportunity when presented to slap a lovely arse. "

― Elizabeth Hoyt , Darling Beast (Maiden Lane, #7)