"So, do you believe now?" Danny asked, his voice back to its original feminine state.
"You... I'm not dreaming am I? Some seriously fucked up dream? Or did you guys drug me?" Mary asked. Sara rolled her eyes and swished her tail in annoyance. Mary's denial was getting to her. The facts were staring her in the face. Almost literally, since Sara knew if she walked up to Mary her breasts would be in Mary's face.
"This is as real as anything else in the world is." Danny said calmly. And his calm demeanor was why he was a caretaker of new subjects, and not the ever impatient Sara.
"You turned into a girl." Mary said.
"Uh, not exactly. I already said I was originally a subject, who joined the project. But the first vial I took was the gender swapping vial. The one I just took was a milder version of the reversal vial. Reverts the consumer back to their original form without any of the memory erasing side effects. But..." Danny's voice cracked and an Adam's apple became evident in his neck.
His male body returned. Breasts melted into strong pecs, arms and legs became more toned, and his jaw took on a hard line. The hair on Danny's receded, while the hair on his chest and arms grew out. And then his clit swelled until it was at least four inches. Then the tip started to round out, forming a penis head. It continued to stretch until it was a good seven inches flaccid, and a pair of balls dropped into the sack that had once been Danny's vagina.
"...the effects only last a few minutes." Danny said, reassuming his male form.
"So, you can't ever go back to your normal shape?" Mary asked.
"Larger doses of the reversal vial will return you to your original human form. But the risks of prolonged used are unknown, and the duration of the transformation could be anywhere from a month to ten years." Danny said.
Mary nodded, contemplating her choices. Some part of her brain DOES remember what happened before she woke up here, naked and with amnesia. Those parts of her brain also scream at her to stay, and leave her human body. It's so... boring in comparison. And the more Mary looks at Sara, the more she does want to try another vial.
Sara's figure is so captivating. Mary's pussy starts to swell and leak juice down her legs. Danny pretends not to notice. Sara watched Mary staring at her, and fought the erection building. She knew she wouldn't be able to hide it, with her being naked and her penis sliding free of its sheath. Sara excuses herself into the bathroom, where she proceeds to take care of her problem.
Imagining Mary in her other form, with her large breasts and bull cock was orgasmic in itself. Sara's hands worked over her chest, and then slipped down to her genitals. She turned the water on to get some extra lubrication. One strong hand squeezed her growing cock, while another dipped under her balls to tickle her horse cunt. Sara managed to contain the whinny pressing at her lips but was unable to stop the hard stomp of her foot as she reached an orgasm.
The sounds were vaguely heard by both Danny and Mary. The two found themselves extremely turned on by the sounds, and enticing smells. It was mucky and barn-like the scent Sara gave off.
"So... what's it going to be?" Danny asked, hoping Mary chose to transform because he really needed a release.
"Well, if it's not too much trouble, can I see what other things those vial can do?" Mary asked blushing, partially from embarrassment, and partially because she's getting aroused. Danny smiled and held out his hand. He lead Mary to his work station, where there were a number of vials. Each labelled with something different.