A shameful trip with my younger sister - Minase Fuka WNZ-314

I want to be my brother's personal pet... During their trip, the younger sister eagerly anticipates what shameful sexual acts her brother will commit. Unexpectedly, her brother's orders involve humiliating outdoor activities: being naked in a bowling alley, and being brutally violated in an open-air hot spring... It's beyond the younger sister's imagination, but as a sex slave, she obediently accepts...