How do the actions of the protagonist develop over time in "Blood"? What is the outcome of the story?

The protagonist goes from lamb to biting the head off of the neighbor's chicken. Finally, he is discovered. Vera finds the head that for some reason he had been unable to part with, and she gives him a graceful way to lie to her, but he finally admits the truth expecting revulsion or disgust. Instead, to his surprise, she simply asks him about his experience.