The room that Red Guy led her to was a laboratory. It contained a chemistry set and what looked like a milking machine. Strangely, the pumps connected to a container with a liquid that seemed familiar to her. It was a glowing yellow colour. There were also beakers filled with that same liquid, as well as a syringe that was bigger than any she had ever seen. It was also filled with that same fluid and had no needle attached to it. Instead it had something like a cork attached to it.

"Now thiiiiis... is where the magic happens. I was able to salvage some of the formula you and you brother worked on. With a help of a brilliant man, i was able to modify the formula. I of course had to perform certain... favours for him to bring this project to completion. But i didn't mind. Not at all. H-hm!'' Red told her.

His erect cock twitched as he finished saying those last few words.

"Now this device can act as a sort of reverse-milking machine. We just put these cups on your udders and hold them there. I'll help. It should relax the milk ducts and allow that marvelous concoction to fill them. And... expand them. The liquid can transfer it's ability to make things grow to other liquids. In this case, your milk. As well as... mine." he explained to her.

"Your... milk?" she asked with confusion.

"Oh... we'll get to that. Let us start with you." he replied.

She sat down beside the machine, grabbed two of the cups and put them on two of her teats. Red sat down behind her and put the remaining cups on the remaining teats. The front of his body was against her back and his cock was between her buttocks. They both held the cups in place while the formula from the container travelled through the tubes and into the cups, enveloping her teats. Red Guy couldn't help but dry-hump her very slowly, thrusting his cock up and down between her cheeks, giving her a very gentle "hot-dogging".

At first, the liquid simply stayed in the cups, but after over a minute, it started filling her udder. It started expanding. It eventually grew to more than half its previous size. The teats became thicker as well. So much so, that the cups did not need to be held in place anymore. They were starting to become too big for the cups. She told him that it starting to hurt a bit. Red then let go of one of the cups and turned the machine off. He then removed each cup. Each came off the teats with a wet "pop" sound, and a tiny bit of the serum dripped out of them.

"That looks... absolutely gorgeous!" he exclaimed.

The udder was big enough to cover her entire belly. Her legs were spread and it was wide enough to cover the entire space between them. She felt a fullness and pressure in that part of her. Droplets of milk were dripping from each teat once every two seconds. Red guy squeezed one of the teats and milk shot out of it with surprising pressure. It sprinkled the entire lower part of his body, making his belly, legs, cock and balls wet.

"Oooooh, that will do. That will most certainly be adequate. Now i'm going to do some growing of my own" he said.

He grabbed the large needle-less syringe and placed the tip into his urethra. He then slowly pressed on the plunger. The growth serum was going down his shaft and into his balls and prostate. His testicles started expanding as they were filling with fluid. His penis slightly grew in width and length as well. The formula was mixing with his semen. His balls became big enough to reach the floor. He was feeling a great amount of pressure within them. The small amount of pain he felt was nothing in comparisson to the pleasure he felt in his huge, swollen nuts.

When the syringe was empty, he set it on the table and looked at Cow.

"And now, dear Cow, we are good to go" he said.