Twinstincts

Isabella and Natalia are fraternal twin sisters. And much like their genetics, their personalities are very different. They only have a few things in common, and one of them is... They're both vampires...
Isabella and Natalia are known to the world. Everyone knows about them and that they can both sing, the only thing they don't know is that they're vampires.
Isabella and Natalia are related to someone very famous, Harry Styles. Harry is the girls' older sister the three of them can sing and the twins get signed into the same record label as Harry, Syco Records. They become famous and start touring the world. Isn't that hard for teenage, vampire girls?
Natalia can handle everything perfectly fine, but Isabella cannot. She has a hard time controlling herself. So Isabella and Natalia tell the 1D boys, 5sos boys, and a few friends their secret. And they keep it, until one night...