Iris awoke the next morning and immediately noticed a change in her body. She felt... heavier. It took her a little extra effort to get out of bed, her breasts swinging freely beneath her gown. She walked into the bathroom to look at herself, and noticed already that her belly had begun to change shape. It was subtle, but it curved out slightly in a way it had not the day prior. Iris ran a hand over the new crest of her stomach, turned to the side in the mirror to see her profile. Her huge breasts hung down over her belly, both nipples dripping onto the floor. She gazed down at her body for a long time, stroking her tits and playing with her nipples, admiring how she had transformed into a perfect milking machine, and a perfect breeder.
The knock came at the door as Cindy arrived for breakfast, and as she entered, Iris was already bent over the bed, waiting for her shot. Cindy smiled at her, and wordlessly performed the injection.
"You're such a good girl, Iris." Iris blushed at the compliment.
"Thank you. I wanna be good. When I'm good, I feel good." As the hormones had taken effect over the time she had been there, Iris had unconsciously formed an association between the shots and her pleasure. As she grew more and more aroused, less and less capable of independent thought, more and more submissive and obedient, Iris grew to love the way her body and mind were changing. Sometimes, Iris felt like she could stay there being milked forever.
"Well, be good and have some breakfast. Oh, and get your milker on, you're leaking all over the floor. We wouldn't want to waste any of that, now would we?" Cindy chastised. Iris nodded and grabbed the machine, attaching the suction cups to her receptive nipples and switching it on. As the suction began, Iris shuddered with pleasure and reached down to touch herself, not caring that she was being watched. Cindy smiled and let herself out, leaving Iris to her own devices.
The day went by as usual, with Iris occasionally swapping out the containers on the milking machine as they filled up, her breasts producing milk continuously to the point that even thirty minutes after being milked, they would become engorged to a painful degree, causing the need for constant milking. As she went about her day, Iris noticed her belly continue to slowly change shape, growing slightly in size as the day went on. She felt heavier, not just her breasts, but her whole body. She felt more tired, spending much of the day laying down, her huge breasts splayed out to the sides. I wonder what's gonna happen next, she thought with a shiver.
Over the next three days, Iris's belly swelled to the size of a woman six months' pregnant. Iris felt the pressure of the growing eggs pressing up against her organs, her womb stretching rapidly as it accommodated the pregnancy. Her stomach was now large enough that her breasts rested on top of it, and when she wasn't attached to a milker, her nipples sent rivulets of milk running over her round belly and dripping off onto the floor. As time went by, she found it harder and harder to walk around as she grew bigger and bigger. Soon she was able to feel the basic shape of the eggs inside of her if she ran her hand over her taut skin. They were soft, but distinct, and she could feel at least two dozen, if not more. Twice daily, after her hormone injection, a researcher came to her room for a progress exam, measuring the size of her stomach and palpating her abdomen.
On the fifth day after being impregnated, Iris was brought to a room for an ultrasound. She now appeared to be eight months' pregnant, and Iris walked slowly to the exam room with her hands cupped beneath her belly. She undressed and lay down naked on the table, and the ultrasound technician coated her distended stomach with clear jelly. Iris giggled at the sensation and touched her clit idly. She no longer felt any sense of shame at masturbating openly, and the researchers seemed to encourage it anyway. The technician ran the wand over her belly, black and white images on the screen showing dozens of round, soft-shelled eggs about the size of tangerines.