He's my demon butler

Serenity grace forevermores, that is my name, my cursed wretched name, i am 17years old. My family has been cursed for , i bet since the day the earth was created. And as for i, am also cursed. Born to a royal wealthy family, but much to my families disgrace, i was born a girl. So ever since born i was taught that all my families disgrace was my doing for not being a boy. so in return for not being a boy i am being treated as a slave....no much worse than a slave...never to be admited as a royal part of the family...my family terible secret. and why am i a secret, is because in order for my family to gain more wealth they need to engage their "son" to the elites daughter. the elite are the top of the royals. But to makes things much worse for me my mother, sorry i mean mistress, had a baby boy, much to their joy. His name is alexander, a rotten spoiled child, who is weak of health, he is right now 3 years old and i am his servant. ...and this is the story of how i lost my soul and gained a hell of a butler.