My Sister Loves Me, but My Brother Has Been Planning for a Long Time

Book-traveling system+yandere+redemption+extreme pull+HE [The obedient puppy in the early stage and the dank, yandere and bad dog in the later stage VS the vicious young lady on the outside but sober on the inside] Sheng Zhuxiao transforms into a vicious female supporting character who tortures the yandere male supporting character. It has been five years since I came here, and my blackening value has not changed at all. The system says that the world is in danger of collapse. Then. "Slave him and let him wash his clothes every day." "Sister's clothes smell so good, I love them so much." "Insult him, you are just a dog I raised." "I am willing to be my sister's dog for the rest of my life, don't abandon me." "Abuse him and make him eat food he hates every day." "Not only am I willing to eat my sister's leftovers, but if she doesn't mind, I'm also willing to eat them directly from my sister's mouth." ... The system feels that these are not enough, and must humiliate him to its heart's content and fill his heart with hatred, so that he can grow into a qualified villain. Sheng Zhuxiao:? ? ? — — — — Sheng Zhuxiao finally completed the task conscientiously, thinking that she would return to modern times and live the life of a rich young woman. Unexpectedly, after escaping, he was pulled back by the system within a few minutes. "It's been five years, sister, you are finally back..." "Sister, I haven't forgotten what you taught me!" "If you like her, snatch her away and imprison her." The once lonely and well-behaved puppy has grown into a sickly, crazy and paranoid wolfdog. "Sister, be good, the way you cry will only make my heart beat more." PS: The previous year will be lower and the later period will be higher.