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Women gain the ability to shrink down to a very small size, around six inches tall, at will. It takes less than a minute, and they can go back to their normal size whenever they choose to. While shrunken, a woman's strength is decreased as well, but her body can withstand and accommodate anything it could at its full size. If she can manage to fit a twelve-inch dildo normally, she can do it when she's tiny, too, her hips spreading, pussy stretching, and belly bulging incredibly around the enormous intrusion.
At first, many women don't want to use their shrinking powers during sex, because society sees it as demeaning and perverse. Most of them later give in to curiosity, drunken horniness, or begging boyfriends and try it out. Once is all it takes. The rush of being so tiny and powerless, the eye-rollingly intense feeling of being impossibly full of throbbing cock, the sensation of their bellies bloating with gush after gush of sticky cum, and the knowledge that they can stop whenever they want are enough to give almost any girl a raging size difference fetish.
After a couple of years, shrunken sex has gone from a dirty taboo to being normal and almost expected. Shrink-friendly sex toys and tiny "slutty fairy" costumes become wildly popular, and groups of giggling young women point at handsome men and whisper things like "I wouldn't mind letting him wear me for a while." Some women even spend most or all of their time shrunken down, choosing to live as minigirls to save space and rent money. Brides wear tiny wedding dresses when they say their vows at the altar, and when their new husbands use them as happily whimpering human cocksleeves on their wedding nights. Girlfriends shrink down in dark theaters and sneak under their boyfriends' clothes for a quick public size-fuck, biting their lips and struggling to resist crying out from the repeated climaxes hammering their tiny bodies. For most girls, being a tiny, overstuffed human condom is fun, hot, and satisfying.