She actually seems to like it

In a heavily monitored holding cell, Natalie was pounding away at her new cock. The two physicians moved her to their secret facility after she passed out from her transformations. Milk streamed from her thick, 1.5 inch nipples as she approached her climax.

Right now, they were watching her from behind a reinforced 2-way mirror and getting chewed out by their boss.

"You want to explain THAT to me?!" shouted their overseer as he gestured to the girl past the window.

"We're sorry, sir! None of the other girls had a reaction like this. We had no idea the formula would alter her so drastically!" the first doctor whimpered.

"And besides, the treatment did technically work. Her breasts have more than quadrupled in size, and we can verify that she is lactating." the second doctor chimed in.

"Then how do you explain the rest of it, hmm? The bitch is a giant! Not to mention the massive dong she's jacking off at this very moment!" the director fumed.

He wasn't wrong. The job was simple: give the girl big titties and bring her back for milking. And yet, before them stood a seven-foot tall, amazonian hermaphrodite! That body wasn't just for show either. Between her tree-trunk thighs, watermelon-sized mammaries, and a moderate increase to her muscle mass, Natalie currently weighed some 370 lbs. She was incredibly strong too, though only time would tell just how strong she was. For now, the crew was fortunate that she'd been content to wait in her room and masturbate.

"The chemicals we used came from the same batch as the others. Miss Lind's body must have contained some unforeseen factor, a recessive gene, maybe an abundance or shortage of particular enzymes. Whatever it may be, that was what did this to her, not us." the scientists agreed.

Their boss sighed. As mad as he and the other board members were, there was nothing that could really be done. Getting rid of the two nerds here wasn't going to undo the problem, much less stop another fuck-up like it from happening again.

"We'll need to be careful from hereon out. Pay closer attention during the screenings, test the subjects more thoroughly. Maybe we can check out the girl's DNA and see if that gets us some answers." the man said, defeated.

A muffled cry and thud emitted from beyond the mirror. It seemed Natalie finally came, partially staining her floor and the mirror.

"In the meantime...." he continued. "See if you can get her fitted for some pumps. We can still collect the milk she makes, maybe make up for some of the losses. And see if you can stop her from making such a mess."

Their work was cut out for them. It was better than "disappearing" like other employees who made one-too-many mistakes, but handling Natalie was going to be quite the undertaking.