The fate of a busty girl is a sad one. When she was little, boys made fun of her, and in middle school, all the guys who approached her were only interested in her body. So she lost the ability to trust men, and when she married a trustworthy man, she grew old in a sexless marriage, wasting her big breasts, and suffering from stiff shoulders and sexual frustration. Hinako is lucky, since it's thanks to her perverted husband that she's been able to be used as a sex slave like this.