Cassie had asked her owner for a new set of tits a while ago. Whilst her B cups were perky, she hated that men’s attention was at all times pulled in the direction of women with larger breasts. Her Master had agreed.

“Yes slave, your tits are too small,” He paused a moment.

“You know those aren’t going to be cheap though, so you are going to have to earn those upgrades”. Cassie’s body filled with excitement and humiliation the sound of her Masters words. She knew he would make her work hard for it but in the end it would be worth it.

“Master, i want them to be at least a Double D,” Cassie Pleaded. She knew how much her would love her once she had them. After much deepthroat work, a few hundred cumshots and a few too many loads in her ass, her master came to her. “You’ve finally earnt those bolt on tits you asked for slave” He pat her on the head as she sat below him on the floor.

As he locked Cassie in her cage for the night, he spoke. “Slave, I’ve booked those upgrades in for tomorrow”.

Cassie spent half the night tossing and turning in anticipation. She was finally gonna have the body she had at all times wanted. As she dosed off, she thoughts about all the new methods her owner would use her once her new boobs had finally healed.

She must not have noticed when she did finally fall asleep because she was awoken abruptly by her master banging his keys on the cage. Like usual Cassie’s owner stuck his long thick shaft through a gap in her cage. A morning ritual that provided her morning breakfast.

“Hurry up slave, the doctor is here to give you nice new tits”. He spoke down to her, as if she was taking to long.

Not wanting to displease her owner and scared he would send the doctor away if she took to long she hurried her mouth onto his cock. Sure enough, after a few minutes of throat fucking herself on his shaft in desperation, he pulled out and came on the floor in front of the cage. Her breakfast was served.

Unlocking her cage he spoke “Eat your breakfast and come down stairs, the Doc is waiting”. Cassie was nervous. Why had the doctor come to their home?

Eagerly slurping his precious seed as she crawled out of her cage, nerves hit her. When her master left the room, she got dressed in a tight white crop top and black booty shorts.

Looking out the window she noticed that there was a van with big letters printed on the side. it read V-E-T. Cassie thought if one of her masters animals on the ranch was sick but brushed it off. Climbing down the stairs she was met by her owner and a strange man.

“This is the Doctor that will be giving you your upgrades,” Cassie looked confused as her master directed her closer.

“Aren’t we going to the hospital?” She asked her owner in a low voice.

Cassie was confused why a doctor would come visit them for a boob job. Cassie was expecting to stay a few days in hospital recovering at least.

“Nonsense, its the twenty first century. We have modern ways of giving women what they want,” He said. Her master roughed her hair making Cassie reminding her how stupid she could be.

The doctor was old but she trusted his voice. it was sweet. After all, master wouldn’t put her at any harm.

“Kneel for the man,” her owner commanded.

With almost immediate response, her body moved into her kneeling position. legs aside making sure that her pussy was more easily accessible. it was so automatic these days that her master didn’t even have to look at her to know she would comply.

Cassie’s owner walked behind her and one by one grab her boobs out of her white top and flopped them out on display for the doctor. She turned red with embarrassment. Whilst she was used to her masters touch, she hadn’t yet become used to other people watching her domination.

Something deep inside Cassie still wanted to cover up but her two years of training kicked in. She kept her eyes forward and didn’t dare to blink. The doctor motioned over to her with a very large needle. The type that is usually used on the animal of the ranch. She wanted to flinch. Out the corner of her eye she read the letters on the needle.

HU-SERUM was printed in big bold letters.

She continued to hold her position not wanting to incur the wrath of her masters punishment if she let him down.

“You will sleep for a few days darling and when you wake up you will feel foggy,” the vet paused before speaking again. “Don’t worry, the serum will do it’s work whilst you are sleeping”. The Vets touch felt kind, as if he does this daily.

Cassie’s eyes slowly closed, the last thing she saw for a few days was the doctor walking towards the front door. She collapsed at the base of the stairs unable to move until she fell asleep.

A few days later she awoke to discover her once perky tits had grown to large, full G Cups. Cassie could see the blue bulging veins through her skin. They were so heavy Cassie struggled to stand upright.

Her master spoke from the corner of the room. “Careful slave, you’ll need time to get used to those udders”.

Cassie’s brain was foggy just like the doctor had anticipated. Her master had never called her tits udders before but she could see why.

Barely being able to speak, she muttered. “Master….My….My udders, They are aching”.