"They were inseparable." Narcissa said, turning to face Nymphadora.
"But Bellatrix became a monster, so it's understandable why my mother left." Nymphadora said defensively, crossing her arms.
Narcissa snorted in disgust. "Is that what she told you? I guess she thought if she kept saying that it would become true, and she could sleep easier at night. But it was Andi's fault. Bellatrix became what she was. Your mother isn't a saint because she left with your father, she's just a tainted as we are. When I mean that she and Bella were inseparable, I mean just that. They thought of each other as soulmates and you can guess where this is going."
Nymphadora shifted uncomfortably but refused to give Narcissa the satisfaction of an answer.
"That means they kissed and they fuck and were deeply in love with each other." Narcissa continued on. "It was incestuous, wrong, and some people would argued narcissistic-"
"And you knew." Nymphadora interrupted.
"Yes, I knew. Anybody with eyes and a brain knew," Narcissa sighed. "But everyone refused to accept it. As long as they kept the incestuous homosexual relationship in the dark, they wouldn't truly deal with the situation."
"Why are you telling me this?"
"Because you're mother is going to die."
Nymphadora looked up at her startled. "Excuse me?"
"You heard me, Andromeda's going to die and it's all her fault." Narcissa said. "She killed her soulmate and she only have weeks to live."
The young Metamorphmagus was already shaking her head. "You're lying, there's no way..."
"You truly don't understand the sacrifice your mother made when she killed Bellatrix to protect you," Narcissa said coming to a realization. "It's one thing for somebody else to kill your soulmate. You're always have that feeling of that your never be whole again, there's always that feeling like you forgotten something. That stays with you forever. But for you, yourself, to kill your own soulmate. Well you just signed your own death warranty."
"How do you know all this?" Nymphadora asked quietly.
"Mine was killed by Voldemort on October 31st, 1981." Narcissa answered. "It's the worse feeling to know that the person you were supposed spend your life with dies by somebody's hand, I can't imagine what pain Andromeda is feeling because she killed hers."