How could you be best friends with the boy who called you a witch, the first time you spoke, it is probably the acceptance in that statement "you're a witch", or maybe the reason is that I have been looking for an answer, to the strange things happening around me, nonetheless we have become best friends and we promised ourselves that nothing would ever come between us.
Of course, we were little kids unaware of the cruel world that we live in, the first test to our friendship started on the train to Hogwarts, I being a beautiful girl, the most beautiful Severus would say, the others treated me well, but Severus wasn't as beautiful or as well mannered as I am, coming from a house where the only way to communicate is by shouting, he knew but never told me, that we would be in different houses that had an old feud between them, probably as old as the castle itself, he thought he was protecting me, he shouldn't have.
No matter what everyone else said, we decided to face the world thinking our friendship is strong enough and we could handle whatever comes our way, but we were still too young to understand the world yet, as we grew up the challenges grew, the people in my house hated me for befriending the enemy, the people in his house hated him for befriending a mudblood, but we fought with all of our might, I thought we were strong enough but everyone has a limit, you can't fight forever, at least that's what I told myself when he called me that awful name.
He tried to apologise but I pushed him away, I was afraid of him though I know I shouldn't, after a while he stopped apologising but I couldn't stop thinking that I could have handled the situation differently, but he was already moving on thinking I no longer cared for him
After a summer of thinking, I decided to see how much he really cares about me, and though I hated doing that I accepted Potter's request to go with him on a date, I searched for Severus as we were leaving eager to see his reaction, hoping I could see my friend even for a second, but he didn't glance at me once, I got mad again and decided to try and enjoy the trip and somewhere along that line, I fell in love with Potter, how that happened I never knew, but a part inside me felt guilty as I grew to care for Potter, the little girl's part, the one that promised Severus long time ago that we will always be friends, no matter what.
Soon enough we were graduating, and I saw Severus choose the route of darkness, the little girl's part inside me, the one that still thought of Severus as a friend, wanted to go after him to save him, but the mature part thought he was for ever gone, how foolish I was.
Now standing in front of my son trying to save him from death from the horrible man who wanted to kill him, but wanted to spare me, and I knew why, I knew why he didn't want to kill me, Severus must have asked for my life to be spared, what he said to that horrible man to convince him to spare me, I don't think I would ever know, but I know for sure that he still cared, even after all this time, I finally knew who was Dumbledore's spy, and I thought as the green light of the killing curse flew towards me, I could have saved him, if only I had kept my promise, if I fought harder for our friendship, I could have saved us all.