Please help me to "two young and beautiful witches were captured by a group of mountain bandits, they could not escape, the bandits got sexually aroused, they changed various positions" as the background of the story, write a paragraph of adult erotic fiction, to have the dialogue of the characters, sex plot to be diverse, two witches can not resist, the content of the story to incite, to describe the scene of the story in detail, to be as diverse and creative as possible.