Living out on high seas for months on finish it stressful situation, especially for stud who just crave touch of whore. This simple need transforms with time, & becomes much more than that, with freighting imagination taking place, & replacing it with hellish fantasies. Thats exactly what happened to Yuki, who was brought aboard ship originally as an assistant to Commander. He however wanted much more than that, so he ordered her to please him in every way. For her to disobey would have meant excellent dishonor so she complied with enthusiasm. Its amazing what they get away with.