The brother-in-law was home alone because his wife was away. Although he was the brother-in-law, he was fascinated by his sister-in-law because she was just as attractive as his sister and was also a stranger. He could not control himself in the rain. His sister-in-law stopped by because she forgot to bring an umbrella. She was soaked. A loud thunderclap startled her sister-in-law and she rushed to hug him, making him even more determined to commit incest.