I became Uchiha Sasuke's younger brother

Introduction: Ever since the moment Uchiha Hayabusa opened his eyes, endless emptiness has enveloped him. The problem he had from his previous life has become even more severe in this world. Finally one day he lost consciousness. When he woke up many times, he only saw Kakashi, Itachi, Sasuke, Naruto, etc. lying next to him, as well as the glaring tooth marks on their necks. He understood that only blood could relieve his emptiness. The more powerful a person is, the more powerful he is attracted to him. ———— He has always wanted to have a family. In his previous life, he had only a few relatives. Unexpectedly, his good deeds led him to the world of Naruto. He also fulfilled his dream. When he wants to work hard to improve his strength