Pete Plenty stretched and sighed as he walked across the farm early in the morning, starting his daily chores off the same way he did every day, by milking the Miltanks. Pete wasn't like his old man, big and strong and intimidating. While he did have some muscle from working on the farm his whole life, Pete was naturally shorter than average and scrawny, despite his best efforts to bulk up.
Perhaps it was this fact that made him feel so close to one Miltank in particular, who he headed straight for upon entering their barn. Petunia was the smallest of the Miltank his family owned, and for whatever reason she barely produced any milk compared to the others. His pa had been talking about letting her go for a while now, claiming that it was costing more to take care of her than the profits they got from her milk. Pete hated this idea...
Coming up to her pen, he rubbed behind her ears as he greeted her. "Hey girl, how ya feelin'? Feel like ya got a lotta milk in your udder?" Petunia mooed softly and somewhat sadly, shaking her head. Pete gave her a reassuring smile, patting her.
"Don't worry, girl, we'll figure out something... I won't let pa get rid of you... if only there was a way for you to make more milk..."
It was then that Pete realized he'd forgotten his bucket and excused himself to fetch it. As he did, he became aware of a strange glow building behind him. Turning, his eyes went wide as he witnessed Petunia's form growing larger. In a flash, her new body was revealed; standing in her pen was a humanoid Miltank, about as tall as him, with large breasts and very wide hips, udder resting under her stomach. She blinked at him and smiled, glancing over her new form for a moment before looking to him again.
"Do you think I'm big enough now, Petey? I've got two new udders too, see! Maybe now your pa will wanna keep me around!"
Pete nearly fainted on the spot, but held together and rushed off to find his parents.
Sometime later, after a lot of examining her and making calls to the nearest Pokemon Center and Pokemon laboratory, the Plenty family learned about the Anthrolution phenomenon that had been slowly appearing around the world, the news having never reached the mostly isolated family. They were told that Petunia was perfectly fine and likely better than ever in her new form, but to keep an eye out for any strange behavior or bodily changes, as it was possible she had a variant of the transformation that wasn't immediately obvious or that had a more slow burn affect on her body.
Pa was a bit uncomfortable with the whole thing, but seeing how the family, especially Pete, began to bond with Petunia as though she were a member of the family, he couldn't help but relent. Still, it was odd, one of his Pokemon suddenly gaining a human figure with curves that rivaled his own wife's.
For Pete's part, he couldn't get Petunia out of his head. Late that night, he snuck out, wanting to see her again. As he entered the barn, he found her up and waiting for him, seeming to know that he would be visiting her; it wasn't the first time he'd done something like that, back when she was younger and more timid, after all.
"I'm glad to see ya, Petey~!" she greeted happily, lounging on a bed of hay, letting him get a good look at her body. "Especially since in all the excitement... you never milked me, darlin'~..." She cupped a breast, bouncing it in her hand. He blushed... but grabbed a bucket and came into her pen.
Awkwardly, Pete started to caress and tug at her teats, both on her udders and her breasts. The amount of milk was more than when she was a normal Miltank, a fact that pleased both of them... though Petunia mostly just seemed to love the feeling of his hands on her sensitive, leaking nipples. Once she was drained, she insisted that he keep going... one thing led to another, and soon Pete found himself with his pants down, cock plunged into her from behind while his hands squeezed at her breasts somewhat roughly. She managed to muffle her moos of pleasure by biting onto her arm, not wanting to alert the rest of the farmhouse to what they were doing. It didn't take long before Pete was cumming inside of her, slumping afterwards. She chuckled, pulling away from him panting before climbing on top of him to kiss his cheek.
"We'll work on that, hun~... thanks for always bein' so kind to li'l ol' me~..." With that, she let him recover before heading back to the house, blowing him a kiss. As he left... he couldn't help but notice that every other Miltank was staring after him with a range of emotions... mostly curiosity by the look of it. He didn't know what that meant, but was honestly too tired to think much about it as he slunk back to his room.
The next morning, Pete eagerly returned to the barn, ready to milk and see his lovely Petunia, only to find: