Satan had realised something since his twin sons were born. While he hadn't realised it at the time, he had hoped for a girl. He had come to a decision, he would find the perfect female to bare him a daughter, one who would live through the first birth incase it was a boy.
After a month of searching he had found the perfect female. She was a half demon, from a strong father, and a witch, she was married so no one would suspect he was the father, she was beautiful and would make a wonderful mother.
When he asked she had agreed to bare him a child, saying that she wouldn't have had children with her husband anyway as she wanted her children to be strong. They created the child in January.
The child was born in Gringots, something possible with enough money. She was born with dark blue hair, eyes like green fire, a cat like tail with a fluffy tuft at the end and surrounded by green flames with touches of blue. The demon characteristics were soon hidden behind a glamour.
When the baby girl was 15 month old a dark wizard came to the the mother and her daughters home. He killed the mother's husband, the mother was standing in front of the cot in the nursery. She sacrificed herself for her baby. The dark wizard turned his wand on the baby, he spoke the words Avada Kadavra, a green light shot out of the stick in his hand heading for the baby only for the light and man to be engulfed in green fire.
The baby's name was Senga Potter, only child of Lily Potter and only daughter of Satan.
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