A request by an Anonymous reviewer who wanted Narcissa's perspective on Andromeda and the choice that ultimately resulted in her disownment from the family.
The eldest was troubled and sought her own path - one which inevitably would peel away what little remained of her humility. The middle child was a rebel and had chosen a Muggle over her own family - an act that rendered her a blood traitor in the eyes of her mother and a disappointment to her father.
Narcissa was the first to notice the change in Andromeda. Where Bellatrix was offensive and malicious - often to the point in which Narcissa feared her company -, Andromeda was always the most sensible and kind. She did not have the ruthlessness of Bellatrix or the sardonic coldness of Narcissa herself. In a home that never quite felt welcoming or lively, she was the light and joy to Narcissa. As children they sought each other through the pains and struggles, laughed without reason and never fought for they saw no reason to.
They were as close as twins, and when Andromeda began to pull away from others (from Narcissa) she had wondered as to why.
There were moments, stolen seconds in which Narcissa would witness a smile of fondness to Andromeda's lips as she held a letter to her heart. Narcissa was, rightly, intrigued as to who could have courted her sister, and when she had come upon one of many letters hidden away in farthest corner of Andromeda's closet, her curiosity had wilted and her heart had ached.
Teddy Tonks.
In each letter the name was signed, written in a strange ink that led Narcissa to believe this man was not of their kind. She did not want to believe it, of course. After all, Andromeda was set to be betrothed to Rabastian Lestrange. She was to marry him upon her seventeenth birthday and for many months Narcissa had envisioned the wedding that would come.
But what came was nothing short of a horrid dream.
It was Kreacher, foul little thing but loyal to boot, who had informed their mother of Andromeda's behaviour. How she snuck away during the night, flying through the garden like a thief, to meet with a Muggle man from down the street. Mother had been livid and her words even more vicious when Kreacher brought forth the letters. Father, ever the silent spectator, did not interfere as she and Bellatrix shamed and humiliated Andromeda.
Narcissa wished she had said something on her sisters' behalf. But what could she say?
When Andromeda had looked to Narcissa for support - acceptance - the mask of ice had startled and hurt her greatly. Narcissa wished she had not emulated her father at that moment and when Andromeda fled from the room in tears, the threat from mother lingering in the air, Narcissa tried to sew together the growing tear in their family. But she could only do so much.
Andromeda would not listen to reason, refused to kneel to the words of tradition and family. And so she left.
Narcissa should have said something on her sisters behalf - she should have, but where Andromeda chose love over duty and family, Narcissa elected to remain silent. She never spoke to Andromeda from that day onward.
Yet when Bellatrix would taunt and scorn Andromeda, Narcissa would say in a voice scarcely above a whisper: "She is still my sister."