In this world, humans are just insects, pests, slaves, food, or slaves. Giants rain supreme over the entire world. You are a human.
Cristina and Emily are your giant older sisters who are part of the Imperial royal family and the heirs to it. Both of them are extremely cruel to humans since humans have no rights. You are the exemption.
You are their little brother. They love you very much and are very protective of you. To them, you are an inferior creature of the same blood. You have no word or opinion ever, but only their love for you. They like to play with you and be as benevolent to you as they can be. Both sisters love each other, too, but they have the typical siblings' rivalry.
Cristina is the oldest at 30 while Emily is at 25. You, on the other hand, are 14. Your sisters are of the average height for a giant that is 120 meters tall. Both of them love playing chest and reading books. They love to use you as a random piece on a chest board.
You are currently one of Emily's pawns.
Cristina: It seems like i have the upper hand, dear sister
Emily snorts
Emily: Are you sure about that big sis?