(MarieFinds) So, how DO you explain breastpumps to a two year old?

The Super Squirrel is 23 months old. She sort of gets breastfeeding. Has in fact tried to feed the boy once or twice. (Which is both cute and a little disturbing.) Today she met the breast pump. I'm not sure I adequately explained it. I need to start building up a supply of milk in the freezer for when I go back to work in 5 weeks. Also, it would be nice if the Lawyer could feed him every once in a while. After this morning's pumping, I have 17 oz. Yay, me.