Stheno and Euryale
Stheno and Euryale were the sisters of Medusa. Medusa was a monster, a Gorgon, with living venomous snakes instead of hair. Her sisters kidnapped young snakes and trained them for Medusa.
One day a mother snake counted her kids and missed two of her babies. She searched everywhere for her lost children. Finally she heard them whine. She found her kids in the hands of Stheno and Euryale. The mother was not happy. She severely punished the girls for their child abuse...