In Shelly's book "Frankenstein," the creature who is desperately lonely and rejected by humans begins to realize that no human being is ever going to accept him. He decides that he has a demand to make of Victor. He goes to Victor and demands that he make him a female like him. He promises him that he will take the female, and they will go off to the ends of the earth so that no human will ever have to be bothered by them.
Victor begins to think on the decision he had made to make a female like the creature. He becomes more ad more stressed about his decision.
";but as I proceeded in my labor, it became everyday more and more horrible and irksome to me."(151)
Victor begins to realize that the female creature may not find any attachment to the first creature, and that they might even hate each other. He stops his work and closes his laboratory.
Victor realizes that should the two creatures find acceptance of each other that they might produce children and create a race of devils.
"Yet, one of the first results of those sympathies for which the daemon thirsted would be children, and a race of devils would be propagated upon the earth, who might make every existence of the species of man a condition precarious and full of error."(Chapter 3, 152)
"Now, for the first time, the wickedness of my promise burst upon me."