Younger Brother! Don't Call Me Sister, This Is a Paternity Test

[Multiple heroines + no blood relationship + cs + daily life] Cao Yang was reborn, the year after his parents died. At this time in his previous life, he left his sister behind and went to Shanghai alone to pursue his motorcycle dream. His scoundrel grandfather and greedy uncle came to visit him one after another, and he was left to his sister to carry them all alone. When they met again, Cao Nianan had turned into a cold corpse. Police said he was killed during a home invasion and robbery. After returning from rebirth, Cao Yang just wanted to add one more thing to his journey of accumulating connections and getting rich: protect his sister Cao Nian'an and prevent her from suffering. Cao Yang thought that he could continue to guard his sister for the rest of his life. Until the day he brought the school beauty home. The always gentle sister dragged him into the room, locked the door, and handed him a yellowed paternity test report expressionlessly. He and she are not siblings at all. Before Cao Yang could recover from the news, fate gave him a second blow. His sister's twin sister came to the door and begged pitifully to take him in. Two sisters, identical faces, but completely different souls. There is a gentle and considerate person who remembers all his preferences and will bring him a bowl of hot soup late at night; a paranoid and yandere person who looks at him as if he is looking at a collection that belongs only to him. Is this buy one get one free? Ps: Everything is under the control of the protagonist.