Ehehe, his wife is surprised that, after a period of erectile dysfunction, her husband got a very hard boner, as he was young. She doesn't know their own daughter is saving their marriage. Since her husband started looking to his owm daughter with other eyes and discovered her sexual beauty, he is a new man. His balls are full of energy and sperms. For the nature's laws, since his boner is due to his daughter, his sperms should be heading towards his daughter's uterus.