Walburga Black POV
After watching what her son would do in the future, Walburga Black become panic and scared. Eventhough she is bigots, racist and cruel, but inside her heart Regulus still the most important in her life. She can hate other people but she can't hate Regulus like she hates Sirius.
Because Sirius always denied her teaching and make her angry, Regulus always tries to make her happy and uphold Black Family tradition. If she know this will happen 10 years ago, she will kick Regulus from family and burn his tapestry but after more than 14 years of loving her son it's impossible to kick him.
Right now she is scared, with this revelation she believe Dark Lord will chase Regulus and Narcissa. Marriage with Malfoy family will be annulled. At this moment there is one person who could protect Regulus in Hogwarts, it is Dumbledore.
"Go to hell with pureblood, its not worth it if my son is in danger", shouted Walburga before he took floo powder to meet Dumbledore.
Bellatrix Lestrange POV
Bellatrix is angry with her cousin and sister, how dare they betray Dark Lord trust, we all did and follow Dark Lord for the glory of Pureblood. She remembered being ashamed with her sister Andromeda because she choose to marry Mudblood instead of Pureblood and now she will lose another sister because she also choose to betray Dark Lord.
But suddenly she heard Walburga and who had run to floo and it shocked her the most, truthfully she loves her family and betrayal from her family hit her the most. She loves being with Dark Lord and Lestrange because they let her do what she likes. But after hearing Walburga spoke about pureblood her views change slightly.
'If her family is in danger because of pure blood, why should she continue become Death Eater. She did this to uphold her family honor', thought Bellatrix. She didn't know what to choose and she knew her next step is very crucial.
Ministry of magic already suspect her become one of Death Eater, but if she continue following Dark Lord Voldmort there is no turning back from it again. She look at other Black family member it is her father, mother, uncle, grandmother and grandfather.
Acturus Black suddenly said, "See this is why I told you don't join this blood purist agenda, it will destroy Black Family".
"Every time new Dark Lord rise, people will reject them and they are wizard who will fight them. Look what happen to Herpo The Foul, Gellert Grindelwald and many more. They may rules for a few years but after that someone will defeat them and because of you guys foolishness there won't be any Black heir in the future."
Everyone become silent, before this grandfather always prevent us from joining death eater. He didn't believe by killing them pureblood will be honorable. Then he continued, "Do you think by becoming a murderer and torturer will make us more honourable?"
"The answer is no, it won't make us honourable at all. This is my last word, anyone who follow them or join their cause I will remove them from Black family". With one last look grandfather leave us alone.
...…
Malfoy POV
"Argghhhhhhhhhh, my lord please…. it was narcissa who betrayed you", cried Abraxas Malfoy. Voldemort are really angry after watching Narcissa betrayal and then he tortured Abraxas with cruciatus curse.
"But she betrayed me because your son destroyed my diary, tell me why I shouldn't kill your family?"
"My lord, my son marriage with her will be annulled because of her action. Please forgive my son stupidity"
"I will forgive your family if Lucius kill her, if he can kill her that means Malfoy are still loyal to this cause"
Lucius Malfoy who heard his father conversation with Voldemort are paled, after watching Black family betrayal he know Dark Lord will be angry. He come here to change Dark Lord opinion about Narcissa not to kill her.
Truth be told, Narcissa is perfect. Pureblood princess, beautiful, wealthy, and her lineage are very noble. Black family are known having good looking face that's why many wizard sought a marriage contract with their family.
He wanted to marry Narcissa and not to kill her, then he show himself infront of the Dark Lord.
"My Lord, Narcissa is pureblood princess and from Black Family. It a waste of blood if we choose to kill her. I suggest unbreakable vow so she won't betray us", suggest Lucius.
"HOW DARE YOU", shout Voldemort. "Crucio"
Lucius are being tortured by Voldemort, "Tell me Lucius you will kill her"
"My lord but it is waste of blood to kill her".
"Tell me Lucius, did we give any chance to a blood traitor?"
"No, my lord"
"We have killed Bones family because they are blood traitor, Narcissa is blood traitor so why are you protecting her?"
"She is beautiful and I wanted to marry her my lord", said Lucius while shaking because of cruciatus effect.
"Ok ill give you a chance, you can play with her and satisfy your lust before you kill her. If you wanted to live today I wanted an unbreakable vow from you. I want you to promise to kill her and not let her live"
Lucius was speechless, he really liked Narcissa. If he wanted to satisfy his lust he will imperius muggle girl and obliviate them. But he knew if he choose to spare Narcissa, then he will die and Malfoy family will end with him.
"Ok my lord" said Lucius with reluctance