After the girls are seated comfortably in the restaurant booth, Mary pulls out the Pig Vial from her purse. She leans over, her new folds of fat squishing against the table like a cushion. Jess leans in.
"I've got an idea," Mary says conspiratorially, "let's see what happens when we spike the food here." Mary grins and giggles, Jess nods and grins wickedly.
The two fat pig-girls wiggle their way out of the booth and waddle over to the buffet. They each take a plate and pick up the food they want, after which they pour the vial into the food. Each time it runs out, Mary corks it back up and waits for it to refill itself. It no time, the whole of the buffet is spiked with the pig vial.
Waddling back to their booth, the girls look back and see the few customers browsing and taking the food.
Once back, they dig in to their own vast plates of food. They attack the food with gusto. The food is gone quickly, the girl's piggish appetite, for the moment, is sated. With the intake of food, the two continue their changes.
Mary gains a voluptuous pig-like fat body, complete with a tail, floppy ears and a swelled snout. Jess gains even more. A new pair of breasts below her original ballooned ones, and her face pushes outward into an almost full pig head. Both girls gain more weight, straining their clothes and the booth.
Content for the moment, the two girls relax to see what will happen next...