While secretly filming my reclusive sister for surveillance purposes, I discovered she inherited my intense libido and began masturbating repeatedly—eventually even mastering self-induced squirting. To test her further, I gave her food along with an adult toy as a gift. At first hesitant, she quickly realized what it was for—"So that kind of thing?"—and from that day on, used it openly and honestly. As I kept watching, my arousal became uncontrollable, driving me to enter her room. Overcome by desire for her sexually evolved body, I began making her orally pleasure me using the very toy I gave her. Though the camera couldn't capture it, I found her pussy completely shaved bare. Wild with excitement, I made her suck my cock before forcefully plunging into her hairless slit. Thrusting like an animal, she responded in kind with lewd, incestuous moans—proof of our twisted bond. Mid-thrust, she screamed, "I'm cumming, I'm cumming~!" so I stopped and pulled out—only to be met with a geyser-like eruption of creampie juice. Despite being my sister, she's become an incredibly filthy woman, and now I train her daily to be my perfect submissive.