Demon's Daughter — Paula Altenburg

When the Demon Lord discovers the goddess he loves was part of a plot to betray him, he destroys the goddesses' mountain with demon fire and sends them running from the mortal world. He doesn't know that the goddess is pregnant with his child. The goddess dies giving birth to a daughter, and passes her over to the care of an aging priestess named Desire. The goddesses may have fled, but they ensured the demons are now trapped inside of time. Demons are aging.