My timid sister-in-law is incredibly obedient to me! I have a sister-in-law whom I absolutely hate. That's why I always bully her! My sister-in-law and her husband are swapping partners. HUBLK-030

My relationship with my gentle but earnest stepsister is terrible. Because she seems so innocent, everyone assumes she's a serious person, but I hate her. If she tries to act like a good older sister, I slap her! I also subject her to erotic lesbian training, turning her into an absolutely obedient sex slave! But that's not enough; I also get involved in the swapping of my boyfriend and my stepsister's boyfriend! My stepsister, initially confused and teary-eyed, couldn't resist the waves of pleasure and became increasingly wanton… That's the true nature of serious stepsisters. Although I hate my stepsister, I've gotten the best toys, so I figured she won't get tired of them anytime soon.