Long Lost Sisters

The story of the winchester sisters. Denise is the twin sister of Dean Winchester, Samantha is the twin sister of Sam Winchester. Though the girls are the sisters of the most feared hunter's in existence, they aren't completely human. Denise and Samantha are part of something that even the angels must bow down to. With the world getting darker than it already is, can the girls help their brothers survive? Will their secret get them killed? Or will they become as formidable as their brothers in the fight against evil?