"You girls go on, I'll catch you up" Amy replied feeling more than a little flushed.
"What's up?" Lina asked, concerned that her friend was about to change again.
"It's nothing serious," Amy said, knowing it wasn't entirely the truth. "The milker just took the wind out of me a little".
In truth, the stimulation to her breasts and udder had ramped up Amy's libido and she was so horny she felt like she was mere moments away from giving her own performance like Lina before her. She didn't want to admit it to her best friend that being milked had made her feel better than anything she had every experienced before. If Jess and Lina hadn't been watching she'd have been screaming in orgasm, but had managed to keep her composure by digging her nails into the underside of the arm restraints.
"OK," Lina said skeptically, pointing at an ailse that seemed to be labelled 'Novalty' "we'll check out that aisle over there."
"Don't be too long," Jess purred, giving Amy a knowing wink.
Amy wasn't sure if Jess had really clocked what she was about to get up to, but at this point she was so pent up she didn't care. As soon as the the pair disappeared around the corner she slipped her hand underneath her now much smaller udder to try and slide her fingers inside her moist folds like she had numerous times before at home. This time was different and she was momentarily startled to realise that she couldn't reach it from this angle anymore. Some deeper part of her mind realised now that at some point, either when her legs had changed or when her udder had grown in, that her sex had shifted backwards to be only accessible from behind.
With a sudden flash of imagination she picture herself bent over and being fucked from behind by Geoffrey, only he wasn't quite the same mild kid she'd met the other day. No, he was bulked up, strong and had changed... into a male version of herself! She could picture his legs as big, beefy bull-like ones. His horns, much larger than hers, sat proud on his head and his huge bull-cock thrusting in an out of her. Her imagination ran wild as her hand moved back to find her new cow pussy below her tail and she plunged her whole hand inside her wet folds, desparate to replicate the massive cock she was imaginging insde her. Her nose ring bonced gently aginst her upper lip as she pumped in and out of herself. She knew she should be worried about the fact that her vagina had moved and grown so much larger than the tight little thing she'd had before, but it felt so good and she alredy knew that the Milker had chnaged her in a way she was too terrified to voice to Lina or even Jess.
When her transformations had started she'd enjoyed them, wanted them, without worrying about the consequences. Then her extra breasts had grown and she realised for the first time that she didn't know what her final augmented form would be. She'd worried that her breasts would be turned into an udder and that would rob her of her beautiful boobs. Leaving them hanging between her legs with her chest as flat as a board. Then she feared she'd turn completely into a mindless cow. But then her udder had grown in, she had breasts and an udder. At first she was freaked out to have one, it was so different from any of the other changes, strange as they were. Her udder felt completely alien to her... until she was milked... then everything clicked into place.
She had breasts and an udder, cows didn't have that. That meant she was becoming somthing else, something... more. She realised in that moment as milk was streaming from her body, that she didn't just like the sensation, she loved it she wanted to feel it again and again. She knew Lina wouldn't understand, but she needed this. This is what she'd wanted from the moment she chose cow as her augmentation.
Her mind raced now, going back over these thoughts as she masterbated. She brought her other hand up to her breasts and her new teats feeling each one and knewing that they made her feel sexy. She rolled one around in her hand enjoying their new thickness and length with glee. She pictured Geoffrey being the one fondling her as they fucked, revelling in her bovine form. In her mind he was speeding up now so she moved the hand buried deep inside her faster too until she imagined him cumming inside her with an animalistic bellow. Her body acted on her imagination and she came too. She was unable to stop herself givng out a low, contented "Mooooooo".
She worried that Lina and Jess might have heard her, but she couldn't hear them rushing back to investigate. She realised that she had collapsed on to her knees while she'd been pleasuring herself so she stood back up ready to rejoin the others when she spotted the pails of her milk still resting by the Milker. Apart from any external changes like the Milker streching her nipples, she only seemed to change twice a day and she knew she needed more now and somehow she also knew that her milk was the key. She grabbed the closest pail and began to down it.