I, the Banner of Ten Thousand Souls, Was Contracted by My Cowardly Sister from the Start

[Brand-new premise] [Siscon + brocon + behind-the-scenes scheming + ruthless action + dark tone + My little sister is so cute, I dream of having one] Su Mu set out alone to search for his parents, but his human companions betrayed him. They stole the treasure his mother had left behind and killed him. After his death, he transmigrated to a cultivation world and became the ancient demonic artifact, the Banner of Ten Thousand Souls! For ten years, Su Mu was fought over by countless demonic cultivators. In the end, he fell into the hands of Qin Wuye, a volatile female demon at the Mahayana stage. Su Mu thought he was destined to end up as this female demon's foot-wiping rag. Then a summoning array appeared around him. My name is Su Qingran. Today is the day I awaken my martial soul. I must awaken a powerful one, so I can find my missing brother and parents! Brother, just wait. I will find you! But to everyone's astonishment, what I awakened was... a rag? Just as I was utterly disappointed and powerless against my family's accusations and mockery, that rag devoured everyone in the Su family!? And as it ate, it said, “The blood of your own kin really does taste better!” What kind of martial soul did I awaken!? After Su Mu returned, he refined every last person who had bullied his little sister! No one in this world is allowed to bully my sister! As Su Mu helped his little sister grow stronger step by step, a massive outbreak of rifts in time and space revealed the familiar figure of a female demon. Pink hearts sparkled in her eyes. Su Mu was shocked. “Wait, how did you find me too?”