"How did this happen?" I ask. I was trying to hide my arousal towards my now shrunken girlfriend. I clearly failed.
Vanessa giggles, and lets her pants fall leaving her in a baggy tank top and pink panties. She then hops onto my lap and starts to explain what's going on in detail.
"I was funded by various farming companies. They currently want a miniaturization chemical. Essentially, they want to raise more animals on their farms, but the increased cost to feed them makes this a counterproductive move."
She winks, while wiggling her butt in my lap, clearly trying to turn me on.
"So they commissioned two chemical solutions. One to shrink them to a tenth of their full size, and one to reverse it. The idea is to shrink them after they are born and then grow them to full size when they leave the farm. Because of their smaller size, they would need less food to survive essentially doubling their profit."
As she said this she leaned on me and gave me a light kiss. Its at this point that I notice, that she is no longer touching the ground as she sits on me. She is still shrinking. Despite this, she goes out of her way to keep her butt on top of my now erect penis. Sadly, I was still wearing pants.
"I know its a little late to ask, but is that chemical safe for humans?" I ask, concerned that my clear arousal may have come at the cost of putting Vanessa at personal risk.
"Don't worry baby, the chemical was designed with 'accidental' human use in mind; given that it will eventually end up in the hands of farmers and what not. As it is right now, the chemical will shrink me to a tenth of my original size and in a week I return to normal. In my case, I guess I will end up a little over 7 inches for a bit."
She then gets off my lap and almost instantly her remaining clothes just fall off. She around 3"8 at this point and nothing she was wearing fits her anymore.
"There was one side-effect though, the chemical raises one's libido immensely." As she says this she rips my pants of me. (Literally, as now they are but shredded cloth)
"So for the moment, you get a really small and horny girlfriend, and I get a huge dick that gets bigger and bigger from my perspective. Now hurry up and stick me before I get too small for it."
Well then...