"...he'll regress three months with every thrust. That should be enough to make a dent in his age, but not leave him too young," thought Ethan. He also took the prompts suggestions that since he wasn't transforming the user (himself), that he select the "alter reality" option as well, which he did with a click of the mouse before hitting enter.
In Jerry's bedroom, his girlfriend slowly walked over to the bed.
"Instead of a sixty-nine, how about you take me like the nasty little dog you are," said Jerry's girlfriend with a certain air of authority to her. Apparently, Jerry liked to be ordered around a little by his girlfriend in the bedroom, as his eagerness to please his girlfriend only seemed to increase at the order. Soon Jerry was mounting her from behind and began to thrust. Ethan quickly saw what position Jerry was taking and began to wonder--just how long Jerry was going to be older than him. The answer soon turned out to be not long as Jerry seemed eager and willing to thrust, and each thrust becoming easier and more energetic with ever thrust he pushed into his girlfriend. Months slid off of him like sweat with how vigorously he was going at it, with years falling off of Jerry not too far behind.
Ethan watched the transformation taking place. At first it wasn't too noticeable, if Ethan weren't looking for it in particular, but Jerry seemed to be losing mass and bulk with his thrusts. He was still built, and mature looking, but his fine lines and few grays were vanishing as much as the muscle bulk was shrinking with his thrusts. Rather quickly Jerry had left his thirties for his twenties, and was continuing to youthen with no sign of stopping.
As far as Jerry was concerned rather than growing tired, he felt like he was just getting started. This was the best sex he'd had in what felt like years. He was continuing to thin up as memories of being promoted to manager were popping into his head, only to feel like a dream he'd wish would come true soon. He was oddly keeping count of his thrusts, and deciding to challenge himself to do doggy for as long as he could go. Already he was almost halfway to his previous record of thirty-six or so, and he felt like he could keep going all night long. At this point, Jerry was four and half years younger, a man in his late twenties, and still getting younger.
Ethan by now was starting to have his memories rearrange themselves he felt--no longer did he see Jerry as his boss, but now Ethan was the manager, and Jerry his most senior team member beneath him... well, second most senior team member now.
Jerry eagerly pounded another fifty-four times at the urging of his girlfriend--who was really doing him a solid by showing him how to please a woman, instead of all the college coeds he'd fucked before. His musculator, while still defined, was hardly as built as it had been a few thrusts prior, beginning to take on a more lean look as he thrusted. His memories were now nine years younger, making him the most recent new hire and low man on the totem pole in the company at 24.
That ought to be young enough... thought Ethan, but Jerry seemed only more eager to continue thrusting into his now older girlfriend.
"Harder... harder! Are you a man or a boy?" demanded his girlfriend, completely ignorant of the transformation occurring behind her as Jerry thrust himself back into college. His muscles were now noticeably shrinking. Apparently Jerry had done a lot of weight training in college which was now clearly undoing itself rather rapidly as the young man was thrusting himself to a clearly lean if not lanky teenage looking body rather quickly. In Jerry's mind he was now an intern for the company who'd caught the attention of a sick MILF, well she wasn't a MILF per se, but she definitely was older than him, and was rather happy at how he was so energetic and up for going as much as he could, but even he was starting to get to his limits as he was about to... oh... oh... cum.
And with one last thrust, Jerry rolled off and out of the woman and onto the bed, having gone from a bulky 33 year old manager to 18 years and 9 months old, a fresh faced lanky college intern with not too much body hair, but a youthful vigor that he was hoping was going to take him places. The reality shift now made it so that the apartment was his former girlfriend's, turned older friend with benefit.
"Fuck, that felt so good..." said a rather satisfied Jerry.
"And that's how it's supposed to be done my little puppy," said the woman with a rather wicked smile and deciding to lean over and wrap her hand around his dick, which was eager to recover to her touch, to which Jerry grinned and gave moved his hips to her touch, technically counting as a thrust and pushing him three months younger.
"So, am I hired?" joked Jerry all to eagerly.
"Your qualifications do seem to speak rather well for themselves..." purred the woman who was close to a decade older than him now.