Laura McLaren: The mother of Diana Cavendish IV

Diana Cavendish IV a renewed and incredibly awesome witch in the Luna Nova witch academy, the Heiress of the traditional and legendary Cavendish family. We all know about her mother Bernadette Cavendish, but nothing was said about her dad... Or even better, the other mom.
What? Other mother?
How? If was two mothers. How did they will have a child?
MAGIC
Also known as the fertility stone, it was that thing which made possible to the lesbian couple had the girl.
This story is going to tell about how Laura McLaren and Bernadette Cavendish meet each other, about their relation since they meet at Luna Nova, clarifying everything that is going to happen.
In a universe where Bernadette Cavendish never dies, showing everything which could happen at the Cavendish residence, plus the reasons to what happened the way the events did
(This is a remake of an old fic "The mysterious mother")