Brightburn male reader x sister weiss

Weiss is a huntsmen at beacon but before that she was just a normal girl she didn't like her family because they always be in fights and arguments Weiss would beg for them to stop until one night while having dinner her parents were about to yell until a crash happened this silence everyone at the table when the saw what did it they were shocked to find a young boy he was the most cutest thing to ever happen to Weiss as she suggested the should take him in everything was fine at first it wasn't until he was 12 he acted differently although a nice boy he is also a boy with superpowers that he wants to use to take the world

(Just to let you know more characters are going to appear)