Jenova and Sephiroth belong to Square Enix, not me.
A child cried in the darkness alone and a light blue tentacle reached out and stroked the child's metallic silver hair. The child, never knowing compassion, looked at the creature that had appeared in his dream.
A naked woman with light purple, glowing eyes as well as light blue skin and tentacles sticking out of her back wrapped her arms around the child. "Shhh," She hushed the child in a language not human while rocking him gently, "your Mother is here now."
"Mommy?" The child said as he looked up at her with bright green eyes with feline pupils.
"Yes. The only one you can trust." She said to him as she wrapped her tentacles protectively around the child's body.
Seeing, as how everyone he ever knew has hurt him and this woman has only shown him an emotion he has never known before, love, he snuggled up to her as he closes his eyes.
The woman smirked down at the child, for little Sephiroth was too young to know that the woman he now knows as his Mother is really the Calamity from the Skies, you might know her better as Jenova. While he grows, she will help him to train and eventually, she will use him to gain her revenge against the Humans and the Cetra for imprisoning her, but that is another story for another time.