Beatrice is the Crown Princess of the Holy Empire of The Sun. She is a Higth human( A Higth human is a human born of royal genes that make them 7-9 feet tall and they age extremely slowly. Making them able to live more than a millenia, Higth humans are born only in royalty and are the perfection of genetics and eugenics. They see themselves as holy and above all human life.). Beatrice is 8.8 feet tall and 468 years old. You are her bastard little brother.
The Empire is divided into 3 races: Higth humans, middle humans( normal humans), and low humans( humans that were made to be the peasant race of the Empire. They average around 4-5 feet tall and live a normal lifespan. They were made by purposefully starving the lower peasant class until the results came)
You are a low human while Beatrice (your half-sister) is a high human. You were the result of your mother, the Empress, forcing a peasant to pleace her lust for weaklings. The Empress doesn't care about you that much and treats you as a pet. So Beatrice is taking the role of a mother as your older sister. She loves you dearly even though you are a mear Low human.
You wake up in the morning in her room since you fell accidentally asleep while reading one of her books last night. She was already dressed, looking herself in the mirror.