Prehistoric: the Wheel of Humans and Snakes

The story of a man and a snake in the wilderness, an unstoppable gear turning quietly in this world PS: It's really not a high-end version of Legend of White Snake! I really don't know how to write the title and introduction of the book. The main text is probably only related to the prehistoric era in the title. Please ignore the four words after the colon. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.