He could not see into the future. He did not know if their plan would work, or if they would remember when it was time. Contrary to what most people thought, the gods did not know everything, and he would not confer with his son on this, because his son was to be effected by the outcome.
"Are you sure about this?" He cautiously questioned the goddesses in front of him, "You shall be all but erased from history. There will be hardly any record of the two of you."
"We know what is to become of us, cousin." The midnight-haired goddess was the one to speak, her talkative sister absolutely silent for the first time in the ruler's memory. "We know that it is possible that we might never remember, might never be remembered, and that we may be forced to live as mortals until our mortal forms' lifespans run out. But those are consequences we are willing to risk, unless you are willing to risk the alternative?"
"Our family, our friends, our lives here on Olympus." The silver-haired goddess stepped forward — her purple dress and black cloak twirling around her bare feet — as she carefully chose her words. "These are important to us, yes. But we are willing to give them up in order to try and prove that these do not matter if you have love. We have had thousands of years here, more than enough time to form an understanding of the human heart. Let us try to find an understanding of the heart as humans. We are willing to be forgotten, Zeus. We are willing to forget. It seems that you are the one who is not willing to let us forget."
"Say your goodbyes, then." Zeus caved in, "Hecate, Nyx, I shall see you tomorrow evening."
The midnight-haired goddess turned to her sister as soon as they were out of the throne room. "I am proud of you, Hecate. You managed to remain quiet for most of the meeting." She grasped Hecate's hands, the wide sleeves of her silver dress enveloping their clasped hands. "I hope this goes well. If it does not, everything will be all for naught."
"It will be fine." Hecate retrieved one of her hands from her sister's vice-like grip and reached to adjust Nyx's dark silver cloak. "Zeus has over a decade to prepare, and I am sure we shall get our memories back. I may not be absolutely positive, but I am sure of it. Trust me on this, okay?"
"You are the one who knows magic." Nyx released her sister's hand, running a hand through her midnight hair before straightening the sapphire-inlaid silver circlet on her forehead. "So I believe you."
Hecate straightened her own silver circlet — inlaid with hematite — before guiding Nyx away from the door to the throne room. "We shall be fine. It will take over a decade, but we shall become ourselves again."
When two bright flashes of light lit up the shrine, the Kusanagi family was not concerned. They just thought it meant that the gods were pleased. When they went back the next morning, however, they discovered two small bundles, in the shapes of baby girls, inside. One was wrapped in a midnight-blue blanket, with a small diamond-in-a-crescent marking on her wrist, and the other was wrapped in a silver blanket, with a star marking on her wrist.
They didn't know what to do. They already had their own baby daughter, as well as their two sons, to take care of. But, the gods had entrusted them with these two girls, so they kept them, and raised them as their own. The girls were named Mika and Bianka Kusanagi, and widly known as Yui Kusanagi's adopted sisters. No one outside the family was ever the wiser. Now, sixteen years have passed since that fateful day.