"Oh my God, Mary," Jess squealed as the pain of her full udder and breasts wracked her mind. "What did we do to ourselves?"
"I don't know," Mary said, grunting. She was trying to move her upper pairs of breasts out of the way so she could breathe. The monstrous mammaries were so bloated and stacked so high, they almost reached the ceiling even when she was sitting on her fat ass. "I just lost...ugh...lost all control! I felt like I had to drink those vials!"
"This udder hurts so bad!" Jess moaned. "I can't hold this milk in much longer. Why did we change back to humans? And why did your breasts get even bigger when the rest of you changed back?"
"I didn't invent the damn vials, I just drink 'em!" Mary shouted between one of her cleavages. "Let's just hope the rest of these changes aren't permanent either."
"I have a feeling they are," Jess said as she grasped her pleading teats. They were starting to drip with milk. "And I can't hold this milk in much longer!"
"Hold it for just a second," Mary said. "I have an idea! Let me come over there."
With great effort, Mary slowly nudged her body, complete with 22 breasts and 3 udders, toward her desperate friend. Her tails helped by grasping nearby fixed objects and pulling her along. The process took the rest of the afternoon and some of the evening, but she finally managed to position her breasts directly in front of Jess' udder.
"Please do something quick!" Jess said. "I can't hold this milk in much longer!"
"Can't..." Mary panted. "Too...exhausted...from moving...twelve feet..." She then fell fast asleep. Jess couldn't even tell, as Mary's impossibly proportioned endowments kept her upright. It was only when she heard the faint sounds of snoring coming from within the pile of fleshy beanbags that she realized what had happened.
"Mary, you ass, wake up! I can't hold this milk in much longer!"
"Oh, sorry," Mary droned. "I was having a dream where there were these vials--"
"If I could find your face I'd slap you silly!" Jess screamed. "Now what was your stupid plan?" Her udder was painfully engorged. Her teats were sore and leaking milk. She couldn't hold it in much longer.
"Between the two of us, we've got a crapload of mass packed into one space," Mary explained. "If we drink even more of the cow and pig vials, we might bloat up enough to collapse into our own gravitational pull."
"Would you put that in plain English?" Jess screamed. Her udder was gurgling loudly now. There wasn't any possible way she'd be able to hold in the twenty gallons of milk that were loading and packing and filling it full to the point of overfilling and bursting out of her sore, sore teats much longer.
"Okay fine," Mary said. "Here are the cliff notes: Drink vials! Get fatter! Implosion! Black hole! Time/space warp! Impossible becomes possible! Back to normal!"
"Well why didn't you freaking say so in the first place?!" Jess shouted. She grabbed the vials, conveniently still within arm's reach, and downed the cow and pig vials. Her Z-cup breasts turned into ultra-uber-deluxe-king-sized-ZZZZZZZZOWIE-WOWIE-WOW-cup breasts, crushing Mary's meager little ZZZZZ-cups flat in half a second. The floor gave out, and then the ground beneath them, as Mary and Jess tumbled into an infinite void from which not even light could escape.
Suddenly...