Dave went to take his shirt off, but Alexis said as she rounded the desk, "Don't bother, honey, all I need is your cock." She hiked her skirt up and pulled her thong aside, then grabbed Dave's stiff equipment out of his pants as she straddled him.
She's never been this horny, he thought as he felt the sensation of sliding into her warm wetness. She thrust against him, and he started matching her thrusts, head back, eyes shut, lost in the pleasure. She moaned each time he went in, apparently keeping it quiet remembering she was in an office, but it was still a sexy, musical sound nonetheless.
They both came, and Alexis made kind of a strangled, gurgling sound, followed by a gasping, "Oh, my God," in a somewhat higher pitch than was normal.
Dave took a couple of deep breaths before opening his eyes. His eyes quickly widened -- Alexis had obviously continued to change as they were having sex. Her breasts were now more like the size of honeydew melons, with a minuscule halter top barely containing them and no bra apparent. The skirt she pulled up was now ruffled like a cheerleader skirt, but literally only a couple of inches long. Her eyes had turned from brown to a deep blue, obvious despite the thick lashes plus eyeliner and mascara that surrounded them. She now wore large silver hoop earrings, and a silver charm dangled from a pierced navel.
"Like, wow, that was exactly what I needed," she said, licking her candy apple red lips just as Dave saw a silver barbell pop into existence in her tongue. A silver ring through one nostril followed. "I just wish I had more time on my lunch break so I could fuck you some more, stud."
Dave watched as her hair separated itself into two long pigtails, stretching down further than her ass. "L-lunch break?" he managed to stutter. Alexis worked from home and basically set her own hours, so she didn't really have a lunch break per se.
"Yeah," said Alexis, her pouty lips looking even poutier, "Remember? Mr. Davis is a real asshole when you're late to his class."
It was then that Dave realized just how young Alexis looked now -- thanks to the thick coat of makeup on her face, it wasn't immediately obvious. He looked back to what he'd written: Whenever a guest is in my office, their clothing will become sexier, tighter, and more revealing. They will become younger... He looked back up at Alexis just in time to see the halter top shrink down to something that was little more than a bikini top, just barely enough to keep her aureoles covered. And he realized the problem was that he hadn't written in any sort of limit --
"Like, fuck Mr. Davis," said Alexis. "I need some more of your cum -- this time in my throat." She knelt down in the space in front of Dave, reaching toward his crotch with bright red fingernails that must have been almost 2 inches long.
Suddenly worried about a visit from the FBI and/or Chris Hansen of "To Catch a Predator," Dave moved his chair a bit to the right and picked up his notepad and pen.
"What's the matter?" asked Alexis. Dave quickly wrote the first thing that came to mind...