Ban's Little Sister? (King Fanfic) #Ange

Hiro is Ban's little sister, unlike Ban she is very generous and thinks of others. She was born immortal, no one knows how. Some think Ban's reason for trying to get to the fountain of youth was for his own needs, but really he wanted to be by his sister so she wouldn't be alone. After he became immortal, he came home and went straight to Hiro's room. Only to find it was ransacked, and Hiro was gone. Kidnapped. Ban swore he would find her if it was the last thing he did. But instead, King did. Hiro was kidnapped by the holy knights, and through her years being there she became friends with King. When he went back to the seven deadly sins, she went out to find him and help them. When she does, and she see's her brother still alive, what will Hiro think?