You make your way to the park, keeping an eye out for potential mischief. Tall trees provide plenty of shade, and it will be easy to remain unobtrusive to others' prying eyes. On the flip side, there's not a lot of people here at this time of day, so you take position behind a tree and wait.
Before long, you spot a jogger heading your way. She's an attractive brunette in her 30's, no doubt taking an effort to remain trim and fit. And that she is, with a slender, well-toned body. 'Well then', you think to yourself, 'let's help her out a little...or a lot!'.
You have to act fast, since you're in a stationary position, so you scan her quickly. "Annette Kennedy, age 36", the machine claims. You'd love to watch her regress slowly, of course, but you need to slow her down somewhat, so you set the machine for a higher rate of regression than before.
At first, your efforts seem for naught, as renewed vigor gives her a burst of speed, as her skin softens, and her body becomes even trimmer than before. Curiously, her ponytail begins to grow out as her hair descends down her back, freeing itself from a hair scrunchie.
You have no choice but to walk after her as quickly as you dare as she reverts to her 20's, then her mid 20's, then her late teens. This isn't helped by the tell-tale sensation of arousal in your body. 'Oh man, I'm getting off on this?' You think so yourself.
As she descends to her early teens, however, she begins to falter as she begins to shrink in size, her legs become slender and coltish, and her already pert breasts becoming smaller. Her waist narrows, and that causes her jogging shorts to slide off of them. She nearly trips, and loses one of her Nike running shoes, as her feet have become smaller as well. She recovers her balance, but utters a very unlady-like expletive or three as she pulls up her shorts and recovers her shoe. You, of course, had gotten a good look at her panties, which seem, if not racy, a bit too expensive for mere jogging.
You take cover behind a tree and halt her regression. Scanning her now, her age has been reduced to a mere 13. A bit more than intended, but you find yourself pleased with the results.
After a few moments, she realizes something is very wrong with her body and clothes and starts to freak out. Hm. The REALITY option would fix that, but part of you wants to keep her somewhat aware of her state. You look over the device, wondering if there's some option you missed.