Kylie and Jen spotted a boy who hadn't been afflicted with the influenza yet. He had his shirt up to his nose and was trying to get to the exit without alerting any of the horse herms that were fucking in the halls. Unfortunately for him, he was easily spotted by the newly changed couple. The two galloped towards him and Jen dived onto his body, knocking him to the ground. "No! Please don't!", he screamed, trying to escape from her powerful grip.
He had no success, and Jen positioned his head towards her cock. The boy closed his eyes and mouth tight, but both opened immediately as Jen's slippery member thrusted inside. After catching up, Kylie lifted up the boy's underside and slowly started to push her cock inside. Her nubs started to vibrate, stimulating his prostate and making his cock drip with precum. Jen moved closer to her mate, and as she did so her long horsecock began to slip down the boy's throat. Her nubs wobbled as they became erect, locking her massive rod inside of him. He gagged and choked but nothing he could do would make it budge an inch. Jen neighed in pleasure as the boy struggled.
After pushing as deep as she could, Kylie let her nubs harden. The boy felt the already unbearable tightness in his ass become even worse as his insides were stretched out. Kylie leaned forward and pulled her partner in for a kiss, their hot breath intermingling as their lips interlocked. Warm saliva dripped down on the boy's back. He could hear their laboured breathing gradually becoming louder. With a loud whinny from the two horse amazons, cum began to flood the boy's body.
His cock, already erect from the forced stimulation, began to grow, swelling even bigger in size. His foreskin receded, pooling into a mass at the base of his cock, becoming his sheath. The head of his cock got flatter, and rings of nubs sprouted out from all over the shaft and at the tip too. He could feel an orifice opening under his balls, which were getting bigger by the second. With an involuntary flex his muscles began their growth, his body becoming taller as well. Large breasts ballooned from his chest and his hips flared out. He, became a her.
She quickly became more horse-like, feet shifting into hooves and face extending into a muzzle. Her hands mutated and her ears pulled up to the top of her head. All throughout her transformation, blonde fur cropped up across her body, and at the end of her changes, with soft hair covering her entirely, a poofy tail pushed out from the end of her spine, waving around excitedly as it came into being. She was now just like Kylie and Jen, a huge horny horse herm with a need to corrupt others with her viral seed. Her name was Anne.
Jen pulled her cock out from Anne's muzzle, and Kylie wrapped her arms around the girl's chest, holding her tight against her body. Kylie's cock was still inside Anne, her nubs stimulating Anne's inner ass. Kylie wrapped one hand around the girl's massive erection and plunged the other inside the girl's hungry pussy. Anne's hooves clopped against the floor and she whinnied in pleasure. A spurt of pre shot out from her horse-cock, and Jen licked it out of the air with her nimble tongue. She swirled the liquid around in her mouth before swallowing it hungrily. It wasn't nearly enough for her, so she knelt down and pushed Anne's tasty cock into her mouth and sucked the appendage all the way down until it pushed through her throat. Jen wrapped her muscular arms around Anne's hips and placed her hands on the sides of Kylie's juicy ass. She threaded her long tongue around Anne's nubs and was rewarded with multiple shots of pre-cum into her stomach.
As Jen and Kylie pleasured her, Anne's lips were twisted into a delighted grin. She felt like she was in heaven.