Kory's feet slipped, throwing his head over tail backwards into the floor and laying face flat on the cold tile. In the blink of a moment, Lina and Amy pounced on their 'prey,' Sam wanted another friend to join the gang, and all good girl groups had at least four members.
At the same time, Samantha's hand whipped up and snatched the bottle out of the air like it was nothing. She'd been a catgirl for little over an hour, but having not only accepted the change, but willfully enjoying it, her body adapted quickly. Her friend? His plan was ballsy, she'd give him that. But he wouldn't be 'ballsy' much longer.
Lina and Amy flipped him over and forced him up into a seated position. He struggled but he never really was the strongest of boys, his already lithe form made even moreso due to the changes he'd been forced to go along with. He gulped, glancing up at Sam, "Now, come on now, we can talk about this, right?"
Samantha tutted, kneeling down and ran a finger along the rim of the milk bottle. "Oh, the time for talking about this ended when you threw the bottle at me, K. Now, drink or you'll be getting a second bottle when it's done. Trust me, it'll all feel better once it's over." She shoved the bottle into his hands, but kept grip of his wrist, guiding it up to his mouth and helping to tilt it back.
The milk slowly, and then more quickly filled his mouth and he closed his eyes, swallowing it bit by bit. It's taste wasn't unpleasant, like a slightly more vanilla glass of normal milk, but somehow creamier than it should be. Under other circumstances, he'd even enjoy the taste if not for what was about to follow. As the milk bottle emptied, Amy and Lina let go of him and sat back cross legged, waiting for the change to start. Samantha gathered the bottle and stood up, crossing her arms and staring down at her soon to be more matching friend.
Kory, for his part, felt weird. Rather than warmth gathering in his stomach after a long drink, it began to gather in his chest, and then spread downward. The warmth built and built, and he couldn't help but bring his hands up to his chest as he suddenly felt his pecs fill with flesh and spill outwards further than they had ever gone before between his fingers. His new breasts expanded from being flat, to a boyish A cup, before slowing down and stopping a bit beyond a respectable B, but the changes weren't finished. The heat moved downwards as two more pairs of breasts spilled forward, smaller than his now originals, but enough to jiggle a bit as he moved.
Cramps took him and he doubled over, as the warmth split directions. His torso pulled inward slightly as his hips expanded, and a pulling sensation in his crotch let him know that 'he' was that in personal pronouns only. At the same time, the warmth spread outwards to his extremities, slimming down his muscles, his hands and feet now petite. As he moaned in discomfort, his voice rose an octave while his hair grew down to his shoulders.
Kory huffed, staring down at their newly changed body while the other three catgirls smiled on.
Now, there were four.