Shawn tried to get out of the hot tub, but Greg grabbed him by the waist, and pulled down his swimsuit, as his hips widened as ass ballooned out... His breasts quickly grew, and his cock shrunk down to a little nub, and a wet wet pussy opened.

"My perfect little fucktoy is created... hope you enjoyed the drink, it was laced with M-X"

Whimpering in arousal, Shawn cried out as Greg's cock slid into his new pussy.  Spreading his pussy lips, the cock bottomed out causing the new slut to moan loudly.

"One last thing slut... the more I fuck you the more feminine you become, and when I cum inside your cunt, it will be permanent bimboism for you, Shawnie girl..."

Shawn could feel the changes continuing as she\he was fucked steadily, each stroke causing her body to shrink, her breasts and ass to enlarge.... his\her mind to cloud, starting to think more about cocks than anything else... then the pulsing of his cock and the hot seed filling her new pussy and dribbling down her thighs...