Dracula

Dracula is trying desperately to have children with his brides. but what if he had a fourth bride. an immortal witch who could not be fully turned. a witch that gets away after he laid with her. due to her magic she can bere his young naturally. you're half witch, half vampire. you grow quickly and are very strong, so the humans kill your mother. they keep you in a travelling circus. but your blood is potent and he finds and frees you. the only child he has is doted on by him and his brides.