Suddenly, I have an in-law sister with a twisted relationship. The older sister treats the younger sister like a toy, and the younger sister is extremely weak-willed, completely obeying the older sister! It's clearly a master-servant relationship! Plus, the older sister is super perverted! The younger sister was supposedly a super straight-A student and a serious girl. But due to the older sister's training, she has become an incredibly lewd woman! I am forced to handle both of their sexual needs and end up worsening their twisted relationship. And having to deal with both a sadist and a masochist at the same time, my mind and body are on the verge of collapse. Of course, my dick is being overused…
