It’s been a rough, hot summer. The apple trees are drying up, withering, and the budget is tighter than ever. To save the farm, Applejack hatched a plan. She’ll drink a quart of Zecora’s breast expanding serum and sell the resulting breastmilk in the open market. Big Mac is suspicious of this body manipulation magic but Applejack swears that once they’re in the green, she’ll ask Zecora to shrink her back down.

Applejack soon eats her words. As the weeks go on and her breasts get bigger and heavier, jiggling within her overalls. Compounding the weight is the sensation of lactation and expansion: a pleasure that she’s never felt before, increasing day by day.

Applejack spend less time farming and working and more time masturbating and groping. 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 she can’t be tempted to grow no more.

Or so she thinks. Little do they know that Applejack’s breastmilk is thoroughly tainted with the serum. When they celebrate their first batch to sell, Applejack gets caught up in the moment and guzzles down a full gallon…