Had another idea for an AR-related scenario (the attached image is completely unrelated, but it served as an inspiration):
An older (but still *very* attractive) woman takes her self-absorbed twenty-something daughter to go to a secluded beach for an attempt at bonding.
The daughter, who still acts a bit like a bratty teenager, just wants to listen to music and sunbathe instead of interacting with her mother.
The mother is seemingly resigned to the failed attempt at bonding with her daughter, but nonetheless offers to rub some sunscreen lotion on the latter.
The daughter flippantly accepts the offer, laying down on her towel, undoing her bikini top, and cranking up the volume of her music device.
The mother just shrugs off her daughter's bratty attitude, pulls out an unmarked bottle of lotion, and begins to tenderly apply it on the latter's body.
However, as the daughter is continuing to ignore her mother and everything else, she starts to notice that the lotion has a very odd (but also strangely pleasant aroma); and just as the daughter's beginning to drift away again, she's suddenly startled by her mother undoing her bikini bottom and applying lotion a bit too "lovingly" on her butt.
The daughter barks at the mother to knock it off, but the latter sheepishly apologizes and thinly accuses herself as just getting wrapped up in remembering how she loved rubbing lotion on her when she was younger.
Sensing that the daughter might not be swayed by that comment, the mother quickly assures her that she'll be drop-dead gorgeous with a tan: the daughter's definitely a bit shallow (and is also starting to really like the lotion's scent), so she begrudgingly allows her mother to keep going.
When the mother finishes rubbing down her daughter, she stops and looks down at the latter's exposed backside with a tender (but knowing) smile: within a few minutes, the daughter starts to slowly but surely "shrink" on top of her untied bikini and towel.
After coming out of her musically enhanced trance, the daughter lazily asks if her mother where she got the lotion: but soon snaps back to reality when she notices that her voice sounds odd.
The daughter opens her eyes and sees her mother: somehow looking taller, and (even more baffling) about 10-15 years younger; the mother smiles down lovingly (and a tad bit seductively) at her daughter, and hands her a compact mirror to look at herself.
The daughter is shocked to see an 11/12-year-old girl starring back (and looks down to see her breasts and pubic hair respectively reduced to small buds and a light patch of fuzz).
As the daughter begins to scream in a now-girlish shriek, the mother abruptly leans in and kisses her right on the mouth; after a long, passionate kiss (and gently stroking her now-younger daughter's hair), the mother steps back and explains that the lotion they used was mixed with a special compound that causes physical regression when it's directly rubbed and absorbed into the skin.
Even though the daughter is understandably bewildered by this development, she can't help but admire her mother's enhanced beauty (and is becoming almost intoxicated with the scent of the lotion hanging even stronger in the air).
The mother unties her bikini top, revealing an absolutely gorgeous pair of breasts to her daughter; the mother then shoots her daughter a lustful look that completely bewitches the latter, asking in a seductive whisper if she'd like to have another rubdown.
The daughter, now utterly entranced (and feeling a strange but intense mixture of emotional love and physical love for her mother), leans back down on her towel and untied bikini facing upward.
The daughter cutely blushes and asks the mother to "get her front," which the latter lovingly obliges; the mother proceeds to rub down the daughter with more lotion, with particular attention to caressing her the latter's nipples, inner thighs, and vaginal folds (and giving her another long, passionate kiss after finishing).
The mother looks down and can feel an inferno in her loins while watching her daughter slowly grow even younger (especially seeing her getting much, much too small for the adult-sized bikini she was wearing just earlier).
The daughter stops regressing at about 5 or 6-years-old, gets up to look at her even-younger body, runs into her mother's arms, and buries her face in the other's soft and bountiful breasts.
By the evening, and after some more application of the lotion, the mother's a naked 13/14-year-old girl breastfeeding her naked infant/toddler-aged daughter: both agreeing that it was the greatest bonding experience they ever had.