Senior Sister Bai Yueguang Has Fallen into a Demon State. How Did My System Get Here?

My name is Luo Ruyue. He was once known as the most talented evildoer in Jiuxuantian for thousands of years. Now, because of being squeezed by the sect, constantly kidnapped by the righteous sect, and forced by his fellow disciples and sisters to hand over the sword's heart and his natal magical power, he has completely... Become a demon. But. With a cold face and a sword in hand, I fought from the ground to the sky with blood dripping from my body. When I vowed to kill all the hypocrites in the world who claim to be righteous, a figure suddenly appeared in front of me. But the sword has been unsheathed, like a pouring water, it is difficult to take it back. That sword pierced his thin body and also broke the heart of me, the fallen devil saint. ... My name is Su Bai. He was a young man who traveled to another world, but was picked up by a senior sister who only had a cold face but a warm heart. It's a pity that I don't have much talent. Even if I have the protection of my senior sister, a holy lady who is a martial arts demon who is rare in ten thousand years, I can only be a little junior disciple with no sense of existence. However, someone told me that day that the kind-hearted Senior Sister Bai Yueguang turned into a vicious evil witch. I laughed. My belated [God-level doting wife system] also made me laugh...