A Demonic Art Changes My Skin, and My Junior Sister Comes Over to Take a Look

I was bound to a villain System, but I'm a good guy by nature! I transmigrated into the sect master of a rundown temple, and just finished giving demonic cultivation arts a makeover when my junior sister came over and poked me in the arm. "Why are your eyes so scary-bright after practicing, Senior Brother?" I quickly covered the cultivation manual with my hand, not daring to tell her the truth. I hurried to stop her: "Don't look! It's a proper cultivation technique."