Neither is willing to wait

Both women rushed him, stripping their remaining clothes off, having discarded their hazmat suits long ago. Neither one was able to contain themselves after watching Aiden literally fuck Grace into submission. Sandra, a forgettably unremarkable girl and the only remaining lab assistant, threw herself to Aiden's feet, practically inhaling his cock as it hit the back of her throat and she began sucking. Diane pressed her modest breasts into Aiden's solid chest, making out with him as best she could with his considerable height.

"I want to be made to spread the virus," Diane said, voice full of desire. "I want to be able to infect anyone and watch them turn into sluts and studs. Watching you transform Grace was the sexiest thing I've ever seen. I want to be able to do that."

"Sounds good to me. Now, open up," Aiden said, before stretching his jaw open as wide as he could. Diane obediently did the same. His tongue extended and morphed, turning into a cock that immediately exploded in a rush of cum, rapidly filling and overflowing the doctor's mouth, making her **** and sputter. Still, she did her best to swallow as much as she could before going back for more, trying to get as much of the delicious liquid as she could.

At the same time, Sandra's efforts bore fruit as she was rewarded with several heavy gouts of cum straight down her throat. She shook, already feeling the virus start to affect her.

"I want to be them," she gasped, pointing at Grace, who was slowly coming around, Abigail, who was now being double-teamed by Dex and Carson in the pussy and ass, and Kaitlyn, who had come back at some point and was now bouncing on Ryan's cock. "No, I want to be the best parts of them," Sandra clarified. "I to be perfect. No woman will be able to hold a candle to me." Aiden smiled, an idea forming in his mind of how to fulfill her wish. He shot another wad of cum on her face as her transformations picked up speed, her body going from forgettable to bombshell.

Diane, meanwhile, had swallowed enough of Aiden's cum to make her stomach stretch outwards, making her appear five months pregnant. The bulge quickly disappeared as the infected cum was absorbed by her body, immediately causing her waist to constrict and her hips and breasts to swell, all notable improvements to the doctor's already respectable proportions.

Diane ran her hands over her new assets, testing their heft and imagining what it would feel like when a man squeezed them while she squeezed his cock, when a sharp pain pierced her tailbone. Dropping to her hands and knees, she gritted her teeth through the pain as her coccyx extended, a new tail pushing out above her curvier ass. Finally, the pain faded and Diane was able to stand up again. Searching for a mirror, she quickly found one and examined her new appendage.

It looked like a scorpion tail, for all intents and purposes. Bulbous segments formed its length, the whole thing about as long as she was tall, a good six feet. On the end was a stinger that dripped with venom, promising a swift infection to anyone it pierced. Diane was quickly able to flex the added limb, as if she had always had it.

"If you want to find someone to use that on, I'd consider going sooner than later," Kaitlyn said, taking a break from her bouncing on Ryan's cock to grind her tight ass against it's purple length. "Most of the people in the school are already infected. I was having a hard time finding any cute guys to fuck. Well, normal cute guys. Plenty of hotties out there now."

"I'm not worried about that," Diane said, leisurely making her way towards the door. "I know a few good places to check. Besides, there's a whole city out there to corrupt. I think I'll manage. Thanks again Aiden. You enjoy those sluts." With a small wave, Diane disappeared down the hallway, on the prowl for prey to fulfill her fantasy.

Aiden decided to leave Diane to her own devices and plunged his towering shaft into Sandra's tightening pussy, which squeezed greedily at him. He fucked her hard, every push sending her new gigantic tits quaking. Just as Aiden suspected, they were as large as Abigail's, her skin alternating between the same pale luminescence as Grace's and Ryan's purple tone. The rest of her body was similarly in flux, her hips slightly altering shape and her face molding itself into her idea of perfect.

"Now you can be anyone you want," Aiden said with a grunt, filling the young woman completely. "But you'll never be able to change that you're a total slut." He came, shooting ropes of thick cum into pussy as she moaned in ecstasy. Pulling out, despite Sandra's pussy's best efforts to stop him, he surveyed his work.

All six of the lab techs were scattered around the room, sucking and fucking each other into oblivion. Abigail was sucking on her own teats as Ryan ate her out, Dex had his dick lodged in Kaitlyn's ass, his sexuality altered so he had a taste for fucking anyone, though he still seemed to prefer anal. Sandra, gaining control of her mimicking abilities, had changed into a clone of Diane and was blowing Carson, and Grace was rubbing up against Aiden's side, cooing at his as he absently groped her mountainous tits.

"Mmmm, what now, my king?" Grace asked, humming contentedly as he tweaked her nipple.

"I think Diane had a good point. The school is completely overrun at this point, but I can tell that no one has left the grounds, meaning that the city is virgin territory. And you know what I like to do with virgins." Grace had a micro-orgasm at the mere memory of how he had manipulated her into deflowering herself. She thought making that a reality for others was the best idea ever. She and Aiden left, leaving the others to their orgy. After a quick stop for barely fitting clothes at the school store, where three awfully realistic looking sex dolls were getting their holes fucked, they left the college campus wandering aimlessly through the twilight city, night having already fallen.