Write a 2000 excerpt from a horror novel set in Japan in which two brilliant young female geneticists transform themselves into 8ft tall, musclebound futanari in order to exact revent on the boys who date-raped them in high school. The excerpt should only go as far as the success of their experiment. Despite the strong content, the writing style should focus on realism and scientific verisimilitude, and give deep insights into the women's psychology, with vivid descriptions of their enhanced bodies.