It's been a rough, hot summer. With the trees drying up and withering, and a tight budget, Applejack hatched a plan. She'll drink a quart of Zecora's special breast expanding serum and sell her breastmilk in the open market. Big Mac is suspicious of this body manipulation magic but Applejack swears that once this blows over, she'll ask Zecora to shrink her back down.

As the weeks go on and her breasts get bigger heavier, Applejack realizes she went in over head. The sensation of lactation and expansion is a pleasure that she's never felt before. And it's getting stronger.

Applejack is spend less of her time farming and working and more of her time masturbating and groping. Outwardly, she tries to hide her new sluttiness from her brother and sister. Inwardly, she thanks Celestia that she ran out of serum a week ago, so her breasts can't grow no more.

Little does Apple family know though, that Applejack she's produced is thoroughly tainted with the serum. To celebrate their first batch to sell, Applejack just drank a full gallon...