The Eldest Sister - Diabolik Lovers Fanfiction

Mei Sakamaki.
She is the eldest and only daughter of the vampire king Karlheinz.
Her father had a small fling with some woman before he was married to his first wife, she fell pregnant and died giving birth to Mei.
All of the wives despised Mei, because she got all of Karlheinz's attention. She was his first born, but also his only daughter, so he was very protective of her.
Her brothers loved her as well, but in a different kind of way....a far more, possessive and romantic kind of way.