Jennifer came up behind Zoe, who was admiring her test subjects and trying to figure out what to do. Suddenly, she jumped as she felt a finger near her asshole.
"Mmmm, you little slut. Nothing under that lab coat, hm?" Jennifer said in a sultry voice.
"I... I... mmmm, I needed to cum for the experiments... and I was horny, so... I took... my clothes off... *moan*" Zoe moaned out as Jennifer's finger circled her waiting hole, teasing her and increasing her pleasure.
"Zoe, change Henry. Maybe a goth bimbo." Jennifer whispered into her ear.
"Yes... mmmm, I'll do that." Zoe moaned out, pressing some buttons on her computer as Jennifer shoved a finger in Zoe's ass.
Jennifer pulled her pants off, revealing her massive horse cock was erect and ready to go. She pushed Zoe up against the one way glass, ripping Zoe's lab coat off. Jennifer shoved her cock deep inside Zoe's asshole as another spray filled Henry's chamber.
Meanwhile, Henry was furiously masturbating. The disgust he'd felt for equines had turned into an intense lust; it felt even better that he wasn't supposed to find them attractive. He loved them. He NEEDED them. But he knew his tiny cock would never be big enough for them. That made him feel even better; he was worthless, less than than the horse herms.
Another spray filled the room. Henry welcomed it, rejecting the fear he'd had the first time. Henry didn't realize that his body was changing.
Immediately, his body hair was gone. Fat began to redistribute; his cock grew, as did his balls. A vagina formed under his rapidly growing balls.
Henry's body was now extremely feminine. His adam's apple disappeared as his chest began to change and grow.
Henry's hips widened as his vagina fully formed before it, too, changed again, becoming equine, as did his cock, his asshole, and his balls.
Henry's mind began to warp as his - or rather her - face feminized rapidly. Her hair grew down her back, turning a midnight black. Permanent makeup (black makeup, heavy black eyeshadow, black nail and toe polish, among other gothic designs) and piercings adorned her face and ears. Her skin turned a ghastly pale, free of blemishes or body hair. She also gained a nose ring, a septum ring, an eyebrow piercing, and a tongue stud. Her DSLs grew bigger than regular horse herms, really giving her a nice bimbo look.
Haley, as she now remembered herself, continued jerking her painfully hard cock off as it finished growing. It was around 16 inches, fully equine in nature - but smaller than most equines. The cock was completely covered in whispy black fur. Her leathery balls grew larger than most equines. Her tail had grown in, matching the color of her cock and hair. Her ears moved to the top of her head and turned equine. Haley’s huge ass finished growing, an incredibly impressive and massive bubble butt that was firm and round. Haley's mind slowed down as her tits finished growing - they were bigger than an average herm's, and absolutely full of milk. Haley finally felt an orgasm coming.
She sprayed cum, milk, and pheromones all over the test room. With that, her IQ dropped rapidly, making her ditzy, horny, and obedient.
She panted, not fully satisfied. She wanted more. But she had to listen to that hot scientist lady.
She looked at the control panel in her room; it was covered in sticky equine fluids.
"Um, like... what button was it again?" Haley said to herself, putting a finger to her huge black lips.
Haley picked one at random, and lucky for her, it was the right one.
Meanwhile, Zoe had cum all over the one way glass, almost blocking her view. She wiped some of it off with her finger and took a big lick of it. Zoe's ass was also full of Jennifer's cum; Jennifer was currently shoving her tongue deep inside Zoe's ass.
Suddenly, Zoe's control panel lit up.
"Like, hey! I totes came all over the room just like you said, smart lady! *Giggle* Like, can I go now or do you want me to, like, jizz more and stuff?" Haley said.
"Um, you can go, Haley. Enjoy your day!" Zoe said, trying not to moan and ending the transmission.
"Mm, Zoe. That was so fucking hot." Jennifer said after removing her face from Zoe's fat cheeks.
"I know, right? Let's try the girls next... or we could call an unsuspecting human and have them enter Haley's room." Zoe said.
Jennifer smiled, knowing exactly what to do next.