Due to a mistake y/n did in potions, all her classmates have turned into babies. Gladly, Snape was fine but being a Slytherin member, y/n is punished to take care of the Slytherin babies while Snape concocts the potion to reverse the damage. However, the ingredients are hard to get, let alone in a huge amount. Therefore, y/n has to take care of the babies for indefinite period.