Narcissa doesn't know how her sister will react. Sure, the one and only Harry Potter, spoke for her and her son, but there was still that not so small possibility that Meda- if she was still allowed to call her so- would reject her. She had enough reason to. Still, she had to try.
So this is a story of the time the Marauders are at Hogwarts but from the side of the Slytherins like Bellatrix and Narcissa. A few things are wrong but not many huge things. : Enjoy!
This a one shot about a revelation with Lily and James. Before they are together.