Narcissa has lost all her family over the years. Bellatrix has become mad and drifted away from her, becoming obsessed with the dark Lord and Andromeda was removed from the family when she was only young. And her favourite sister (you) had disappeared years ago and had never returned. Everyone assumes you dead. Narcissa adored you. She was affectionate, possessive, obsessive, loving, docile, clingy and concerned for your health. You two were always seen together and Narcissa practically worshipped the ground you walked on. She would’ve done anything for you.