Your hardon is throbbing in your pants, compressed painfully inside thanks to the sudden and extremely insistent appearance of your erection.
"Geez!" you exclaim, and reach down into your pants to adjust yourself. You really don't intend to do more than that, but when you feel the sticky-slick sensation of the lube still coating your fingers slide across your cock, you feel a shiver of need run down you that you can't easily deny.
You unbutton your pants in a hurry and shove them down, along with your underwear, feeling immediate relief, at least from the discomfort of the confinement. Once you've got your cock in your hand, the inexplicable urge to put one of the undersized condoms on resurges. You look at the silly thing, a bright day-glo blue you imagine someone thought would appeal to the wearer of something like this. You can't imagine it would ever actually fit on you, but you find you're seriously considering it!
As you start to work the "junior size" prophylactic on to your engorged member, the fit is every bit as tight as you imagined, and the painful squeezing is almost enough to make you rip the thing off yourself. But after you get it on a bit more, the thing stretches out enough to just feel tight, rather than painful. The novelty of it, paired with the odd compulsion, is enough to get you to continue, and soon you've unrolled the entire thing, which manages to just barely cover the entire shaft. You can't help but think you look ridiculous with a tightly bound, blue-tinted dick.
You stroke along the latex-covered erection with a couple of fingers, marveling at how sensitive you feel through it. And it's no wonder the lube leaked out- the thing is practically dripping with the stuff! It gets all over your hands as you idly fondle yourself.
After a few minutes of this, you start to realize that the condom no longer feels particularly tight. Snug still, but comfortably so. Meanwhile, the sensitivity seems to be growing, as is your feeling of need. As you wrap your hand around the electric blue erection, it occurs to you for the first time that maybe the lube is drugged somehow. It would explain a lot, like the sudden erection, the strange compulsions, and the fact that the room seemed to be getting bigger.
You pull your hand off your cock, and you'd swear it had gotten smaller somehow. In fact, looking down at yourself, it doesn't seem to be the only thing! Your arms are skinnier, your torso is thinner, and you can see a pair of slender legs that weren't like that a short while ago. A lot of body hair is gone too, with not a bit left on your smooth, flat chest or tummy, nor on your arms, though you seem to still have a bit underneath them. You watch in disbelief as most of it fades off of your diminished crotch, leaving just a small halo around your long, but slender erection. Well, long in comparison anyway! You're sure you've lost some length there. The hair on your legs, some of the first you remember getting, fades out as well, leaving just a slight dusting around the ankles.
You run to the bathroom and take a good look in the mirror. At first, you see a young version of yourself, a face you remember from high school, but it doesn't last. You realize that your point of view is shifting slightly, the top of your head moving downward against the reflected background. Your face youthens and shifts into someone unfamiliar, an attractive but very young teenager. Freckles fade in across your nose as teenage acne fades out, your brown eyes shift to green, and your shaggy mop of brown hair rearranges into a close-cropped yellow-blond color.
You look down at the slim, slightly awkward-looking Jr. High kid you seem to have become, and realize that the condom now fits just about perfectly.
Figures.