The milk bottle refiller

Once upon a time in a world where everyone loved milk there was a refiller who had control and could strip and reward milk. However it was so rare in their world that it was said to turn you into a cow who was allowed to eat its own milk with healing and magic properties. The refiller wasn't from their world so the milk had no effect on the refiller. Only if the refiller was mean would he ever take the milk for him self unless he loved milk. Many people befriended the refiller but it would never return any favors. One person decided to be nice to everyone since they could be the next refiller. He did it and everyone knew how to get it but then. It wasn't rare anymore so it had no more healing or magic properties but many people enjoy it.