Starting today, I'm the master! I've made my sister Hikari sign a contract with a 300,000 yen debt, forcing her to obey my every command if she fails to repay. My goal is to turn my snobby, condescending sister—always looking down on me, a perverted maid otaku—into a completely submissive maid. I now have full access to her soft, bouncy F-cup breasts, free to grope, suck, and fuck them anytime, anywhere. The ultimate thrill comes from watching her reluctantly service my cock with her tits, her face filled with disdain as she performs titty fuck, fulfilling the ultimate domination fantasy.