Yu Yu Hakusho
Yusuke's ancestor, the woman is never named, but
helps heal Raizen after he sustained injuries from a raid in a human village.
She is a healer, or a witch, I'm not sure on the translation. When Raizen was
about to eat her, she suggests that he indulge in her flesh in a more enjoyable
manner. Raizen leaves her after this, but vows never to eat humans again. Nine
months later, the woman gives birth to a child that will continue to demon gene
until the birth of Yusuke.