Woman Against Fate (TO/SPN crossover)

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Abigail Luna Mikaelson was the oldest daughter of Klaus Mikaelson. He hadn't known about her for a couple of years, until her mother had died. When Abigail's mother died, she was sent to live with her father, after her aunt had gotten in contact with his brother, Elijah.

Abigail grew up with the Mikaelson family, though there was quite a bit of tension and uncertainty throughout the years. Abigail was a good older sister to Hope, and the two were rather close to each other. When Abigail left years later, Hope was distraught, and she felt like she had lost everything.

What Hope hadn't known, was that Abigail had gotten pregnant. She had ran the moment she found out, and she was even more scared when she found out that the baby was the offspring of the devil himself. Her father may have claimed himself to be the devil, but she had met the real one, and she was having a child with him.

When she was a few months along, she was found by two brothers named Dean and Sam Winchester, and their angel friend, Castiel. Dean and Sam had believed that she was human, until Castiel had broke the news to them, scaring them more about the outcome of the child inside of Abigail.

The day Abigail gave birth to the little boy, she had died, but her vampire side had been triggered. She was now a tribrid, and nothing could kill her. When she woke up, her child was crying for her in the arms of Mary Winchester. Abigail didn't know what to do or how to feel, but she knew she had to protect her son, and that meant also from the Winchesters and anyone else that came after him...