After Following My Senior Brother and Becoming a Demon

As the only junior sister brought by the Demon Lord from the Immortal Path, Xuanying originally thought that her senior brother and she were the only ones left with each other, until one day, news came out that her senior brother, the current Demon Lord, was going to marry the most beautiful woman in the Immortal Path. Xuan Ying was furious: I don't agree! In order to monopolize senior brother, Xuan Ying forced herself against the wall, saying that I could do it too, but she accidentally overturned. The senior brother's face turned red and white, turned white and red again, and he didn't dare to show his head for half a month. Unable to deal with her senior brother, Xuan Ying decided to deal with the immortal beauty, but on the way, the demon general guarding the family sent a message asking for help. "Yao Shou! Help! The Demon Lord has lost his memory of being a demon and has turned back into the original Sword Master to liberate the Demon City and do justice for heaven!" Xuan Ying: "???" The Lord of the Demonic City, Xuan Ying, who was usually tough enough to beat the leader of the Immortal Dao backstage, had her nest blown up for the first time in her life. I'm afraid this is not retribution from her senior brother Bidong. ​— Seven hundred years ago, there was great chaos in the Immortal Way, and the entire sect was massacred. The glorious leader Yuntian held his junior sister in his arms to succumb to the demon, and reconstructed her bones from pieces. After controlling the entire Demon Realm step by step, the Demon Lord held the sword and guarded the side of the Demon City. But one day, when he returned to the city with his junior sister's favorite cakes, the aggressive junior sister said arrogant words, which shocked him so much that he couldn't react. Thinking that the best thing is worthy of his only junior sister, the Demon Lord pondered for a long time and transformed himself back into the Yuntian Sword Cultivator he once was. Tips before reading: 1. The junior sister who earns money to support the family X the senior brother who can fight and kill 2. The arrows on both sides are very thick, the filter is very thick, but the channel is not right. 3. The heroine's name may be changed Concept: past, present and future