Michelle lifted the mask off its hook and placed it over her face. It pinched her nose shut, forcing her to breath through her mouth only, and in a moment she knew that she wouldn't even be able to do that. Without any concern though she switched on the pump, and the thick white fluid that was her own processed cum from earlier flowed up the tube.
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Karen didn't even notice this happening. She was too transfixed on Michelle's cock, the scent clouding out every thought except one: suck. Her lips parted and she leaned forward. The head slipped into her mouth. The precum coating the tip slid over her tongue. She was hooked.
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Michelle meanwhile was swallowing a continuous stream of spunk. Her breasts tingled and she brought her hands up to caress her soft mounds, wondering what perverse changes were starting to occur. They swelled a little, her already impressive bust gaining more flesh, and then the tingling concentrated on her nipples. She felt them thicken in her fingers, growing fat like a nursing mother, and then fatter still until they were each over an inch thick. They grew longer then. What started as obscene nipples turned into teats, and yet still they grew.
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Karen was now sucking with gusto. Every time she pulled her head back her tongue swirled around the tip, yearning for more tasty shemale sauce, and then she plunged her head forward, swallowing the rod whole so her nose could nestle amongst Michelle's pubes. Though she couldn't breath like that, her nose was getting coated with the scent she now adored, making it so it was the only thing she smelled when she pulled back.
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The stream of cum came to an end, so Michelle tossed it aside after licking the last drops from the inside. When she looked down, Karen hidden beneath her enlarged bust, she saw with amazement the size of her new nipples. They were still pink, but as thick as a cock and four inches long. Her nipples then started to open, peeling back like foreskin as two unmistakable peeslits appeared. She had dick-nipples. She had fucking dick-nipples! She threw her head back and came.
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Karen did her best to swallow the rushing torrent of cum that flooded her mouth, but her own orgasm made it difficult. Cum squirted from the sides of her mouth as she squirted her own juices over her hand and onto the floor.
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Dick-nipples! What a glorious freak she'd become! "YEESSSSS!!"
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Karen didn't notice her own lips swelling. All she noticed was that no more cum escaped from her eager mouth. Words echoed around in her mind, words that were blasting from a hidden speaker but just beyond the conscious range of hearing. Slut. Ball drainer. Cum dumpster. Her tongue licked the final drops and her mouth let go with a pop.
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A voice boomed over the tannoy. "Well done. You have completed your tests. You are free to go."