You're walking home at night when you suddenly see a little girl crying, you walk over to her and asked where she lived and where are her parents. She said she doesn't have any and live with her big brother. She gave you the address to her house and luckily it's not far.

When you finally get to her house a boy your age steps out wearing a tank top and sweatpants. He let out a sigh of relief and hugged his sister, you finally got to see his face when he is about to thank you. It's your enemy.