The farmer moaned with lust as she continued to suckle Jennifer while she was being fucked. Jen was slowly becoming a slutty horse mare, permanently. Jen pulled off of the farmer's teat and began putting all of her focus into fucking her. Jen moaned as the milk began to have other effects on her, as her cock began to increase in girth, providing a greater surge of pleasure to the farmer.
Eventually, when Jen decided she had had her fill, she blew one final load and pulled out of the farmer's pussy. The farmer had passed out. Jen examined the effects of the farmer's milk. Jen was covered in brown fur and was, essentially, a bipedal horse like the stallion, aside from the lack of hooves. The stallion had either forgotten or not cared that Jen was both male and female when he made the rules about the milk. She had gained qualities of both a well-hung stallion and a slutty mare. Her body had swollen with muscle, her arms and legs now thick tree-trunks that still managed to bear her feminine curves. Her height had increased a bit as well. Her tits had also gained a bit of size, now filled to the brim with the same corruptive milk as the farmer. Jen knew, however, that it was not the same.
Suddenly, Jen heard a loud snort. Turning, she found herself face-to-face with the stallion. Her new height allowed her to see eye-to-eye with him. The stallion said nothing, only pointing to his cock like before and giving a commanding whinny. Jen chuckled. Not wanting to be kept waiting, the stallion lifted his hooves, attempting to push Jen to the ground to assert dominance. Jen reacted quickly, grabbing a hoof with each hand and knocking the horse-man on his back.
Jen crouched down, attempting to comfort the stallion. "I'll do the fucking," she said. "But you have to take a swig of my milk." The stallion said nothing, then whinnied in reluctant approval. Despite his ability to talk, he was still a horse-man of few words. He sat up and Jen began to get into position. She slowly maneuvered his cock into her pussy, sitting down and engulfing the whole thing in her body. Her own erect cock was pressed between her tits, its head seeing the stallion eye-to-eye as well. The stallion didn't want anything to do with it. Jen lifted her right breast up to the stallion's snout, which he wrapped his lips around. Jen began to move up and down slowly on the beast-man's cock, creating a soft moaning from both parties. The stallion kept drinking, not caring how much milk he took in.
The milk's magical properties began to take effect on the stallion. His massive pecs began to swell, with a pair of breasts almost as big as Jen's beginning to take form. While she couldn't see it, Jen recognized the smell of vaginal juices leaking. The intense pleasure caused the stallion's tits to leak milk. The stallion pulled off of Jen's teat, now eying Jen's cock instead. He wrapped his lips around it as best he could. Jen began to titfuck herself as she continued to ride the stallion's cock, causing loads of cum to fire into the stallion's mouth.
The stallion fell back, unable to handle the intense pleasure he was being given. Jen pulled off of the stallion's cock. She gave a familiar whinny, pointing at the herm stallion and motioning with her finger for her to turn over. The mare-stallion stared back, wide-eyed, but graciously obliged. She turned over, exposing her new mare-cunt. Jen took her horse-cock and began to fuck the stallion as she did to Jen earlier. After a while, Jen stopped and allowed the new slutmare to rest.
"But how," asked the stallion, out of breath. Her voice was feminine, yet deep. "The milk should have made me stronger." Jen explained the original curse that changed her milk, causing her to be able to change men into women. Due to Kyle's curse and the stallion's curse, Jen's milk turned men into well-hung stallions and women at the same time, resulting in the stallion's current form. "But what about the farmer," she asked. "Would she become like me with your milk?" "No," Jen replied. "She'd just grow bigger tits." Jen helped the stallion off the ground and turned to see the farmer rising as well, noticing that her abdomen had swollen. "What has happened to her," asked the stallion. "She's pregnant with foals. They'll be born in a few hours or so, probably. They'll be just like me." Jen turned to the stallion and put her hand on her belly. "You're going to be a mother too."