«Beast: An Erotic Short Story» by Susan Hart

Beast is about an archaeologist hired by a mysterious Greek billionaire as a spelunker to descend into one of the very deep and dark places on his property. There are mysterious secrets, thousands of years old, buried there as they go along a narrow passageway her companion, Mithros, begins to hum a mysterious song; partly in Greek; partly in Latin, and the rest in an unknown to her language which sounds ancient. She hears shuffling and snorting sounds and is suddenly afraid, yet curious and excited.