The girl had the breasts of a woman twice her age. The pale, light-brown tits looked deflated, even as they hung straight down through the milking table. 

Dr. Rennard walked over to the unexpectedly compliant girl and gave them a few slaps. Her eyes squeezed shut- no sounds came from her mouth.

“Look at these little empty udders,” the doctor teased cruelly. “I don’t know what we were thinking when we decided to take you in...”

She gave  another slap, harder this time. The girl squeaked and wriggled, finally. 

“I...I...I want to be a cow.” She pleaded.

“To do what?” Dr. Rennard demanded.

“To give milk...to stop being human. I don’t want to think...”

“Well,” The doctor walked around her to a cabinet just out of the girl’s line of vision. “You most certainly have the drive.”

She returned with a set of syringes arranged on a tray in front of the girl. 

“Milk will obviously take a bit...” she flicked the first syringe in her line of sight. Dr. Rennard pierced the skin at the base of the nipple. The would be cow kept staring straight ahead, her eyes slightly watery. 

She continued with her injections, three on each breast leaving mirroring holes.

“Now,” The doctor reached over and pulled the wheeled milker closer. 

“In the meantime, let’s see if you can stand the suction...”

The tubes were a standard width for cows, however, for this cow, they could barely fit side by side at the base. The doctor threaded a soft plastic cup through the bottom and up to their bases. The outer tube would be doing the support work while the inner tubes would be doing the suction work. The girl’s udders were so floppy that the inner tube fit halfway up the empty milk sack. 

“Well, this will be interesting...”

The machine clicked on banging the bases of the large tubes against her chest. The girl screamed from the impact. She sucked in her breath in an attempt to normalize it. 

Dr. Rennard watched as the inner tube crinkled around her udder, expanding and contracting, pulling so hard the flesh lined the tube. 

“It hurts! It hurts!” She tried to kick out of her restraints but to no avail. 

It was fascinating, watching her saggy breasts fill and conform to the tubing. Her teats got puffy, her udders an angry red behind them. 

The doctor switched the suction from alternating to simply sucking. The girl howled, this time trying to pull her chest back to free herself from the pain.

“Ah, ah, no.” She placed a firm hand on her back and held her down. Ignoring the hysterical cow, she counted out three minutes. At the end, she went back to her seat and turned it off. 

The large cups came off easily enough, likely with very little pain. Dr. Rennard marveled at the work of the inner tube. She hated the thought, but they looked like encased sausages. The long udders now began at the base. The areolae was still puffy, but the teat looked like it had extended another millimeter.

She stroked the space between the tubes, as if it would do anything to calm her down. Much as she wanted to rip the tubes off, she knew that if she removed them gently, the result would be worth the work.

“Oh come now, Cow.” She cooed. “This is what you wanted isn’t it?” She placed one hand around the space between her chest and the tube opening, and wriggled it slightly. The girl’s crying reduced to sobs. Encouraged by her calming down, Dr. Rennard continued until the tube slid off completely, the Lube and condensation allowing for a smooth glide.

It was true- her breasts were completely tubular. The modification remained, pulsing slightly as the flesh started to return to normal. The doctor hurriedly reached for spare black tube rings on the shelf below the milker. She gently held the base of her udder until she slipped one around her finger. Forgetting her gentle Manner, she pinched the long teat and forced the rubber ring up to the base. The cow’s screams echoed through the room, nearly deafening her. She reached up and pressed her face into the leather, finally muffling her.

She didn’t know what she was going to with this discovery. Alternative udder sizes didn’t matter. Consistency did. Still holding the girl down she ran gentle fingers down the udder.

“Looks like you’re not useless after all...”

Giving a gentle pump, small white drops hit the floor. The doctor smiled manically.

“How’d you like to be my personal little project?”