Diantha knew something was up with that woman when she saw her figure. She refused to call her 'mother'. Lily was the only person in any life she would call mother.

Anyway, she quietly asked one of the servants; Laural, one of the most trusted maids of the family to keep a careful eye on Cordelia, and sure enough, Cordelia had kept attempting to kill her daughter in an 'accident'. 

Everytime it failed since Diantha was one step ahead. 

Then there came the rare time Karl was at the mansion and he would visit Diantha to check up on her. 

But he saw Diantha looking like she was tortured when he instructed the servants to keep her healthy when she became the next queen.

"Diantha. How did you let this happen to you?" He asked.

"...Cordelia had made an attempt on my life...I think she was sick of me getting all the attention she believed she deserved because she was the one to give me life. I could've fought back, but I thought you wouldn't believe me with words alone...please forgive me...father." Diantha said softly, knowing what words to use for this part of her plan.

Karlheinz was silent as his daughter bowed before rushing to him, as if to find comfort, but not hugging him. He knew his first wife would be jealous of their daughter, but he never thought Cordelia would go this far. Doesn't she know how critical Diantha is for his race?! 

He quietly patted her head, knowing what to say.

"My apologies, my god-flower. I never thought she would ever dare to do such a thing. I promise you, this will be taken care of." He said, knowing what to do.

He knew his sons as well as their sister. He even knew of their 'relationship' with her, and one thing was for certain: They would do anything for her. 

It was no surprise he asked Ayato and Laito to 'take care' of the problematic bride and they accepted with sadistic glee in their eyes.

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That night, Cordelia found herself being pursued. By her male heir no less. She was currently stained with her own blood from injuries and her life was slipping.

'Ah, mother, is something wrong? You look awful.' Ayato mocked her as he was the one holding the bloody knife used to stab her.

Cordelia ran to a balcony where Laito found her. 

"Laito...my dear...please come here....and help me...!" 

"Of course. I'll help." Laito said with a kind face as he walked to Cordelia with a 'gentle' smile hiding the ill intent, and having his 'mother' relax at the words.

But as Laito came close. "I'll put you out of your misery." He said as he shoved her off the balcony where Ayato was waiting.

"This should teach you not to harm our sister, wench." He said as he was ready to burn the woman that caused the triplets so much pain, and nearly took the life of their precious sister.

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Later that day, Ayato and Laito had arrived in their sister's bedroom, and had themselves settled in to her side, both of them embracing her as they fell asleep.

'You won't be hurt by that woman again.'

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