Downstairs, Rick had problems of his own. At two inches tall, the chemist had worked his way up a mountain just to reach the top of his desk. Exasperated and panting, his little stiffy still flagged and hard, he had managed to climb up the side of his desk, leap onto the chair, and scale the mesh back to reach his work station.
Now he had an even more immense problem. That being his chemicals themselves. He had never planned to make an antidote to something that had no potential to work. That came after. While he knew his formulas and the intended reversal, he didn't actually have it made.
"Fuck." The tiny man squeaked. He had to constantly fight the urge to reach down and relieve his cock, knowing fully well that doing so would almost certainly put him at an imcomprehensible size. He fought the urge down and gulped, taking a moment to gather his strength before approaching his stand of vials and containers.
Shit. Shit. Shit. He had never worked so hard in all of his life as he strained to uncork this, unscrew the lid on that, and carefully mix things.
In short order, he had thrown together a tiny sample of liquid in a bottle cap. He paused to check his calculations in a giant note book he kept on the desk, flipping pages with great force, and satisfied, he took a deep breath. He knelt down and pooled the chemical in his hands, lathering it into his tiny body and feeling the distinct tingle.
Something was happening, that was certain. But would it be enough?
Rick gasped and trembled suddenly. Feeling the burn of his flesh starting to warp. He fell to his knees, groaned, and every muscle tensed and spasmed.
His cock throbbed harder. It begged for release. The pressure in his balls became unbearable. He needed to cum. Almost crying with fear, Rick couldn't fight it anymore. He reached down and began jerking his plump cock in his hands. Desperate to make it go away.
It didn't take long. His overstimulated cock blew forth with a jet of cum that splattered on the top of his desk. He fell backwards, sweating, panting, and grimaced as he felt himself changing. The orgasm had triggered something. He... he... was growing!
He gasped in relief and shock as his body began to grow. Bigger and bigger with every heartbeat. He had regrown to six inches tall. Still a long way to go...
But he was bigger!
With blushing embarassment, he realized that his solution was now having the opposite effect. He grew when he came. He had to get himself back to normal.
Well... he laughed slightly. Only one surefire way to do that...
Rick began jerking. Normally, he would have been sore from punishing his cock like this, but it was eager, ready, and felt fantastic. He jizzed off again and cried out a tiny cry as he grew, legs shaking, back to fourteen inches tall. He kept going, it felt better and better, and came again. Only a little trickle of jizz, but the orgasm itself was red hot and delightful. The middle aged chemist groaned and writhed as he approached twenty inches.
No sense but to follow it through now. Restored to a less terrifying size, sweaty, covered in musk, he managed to slip off the table top and find his way to the carpeted corner of the basement. Hidden away, comfortable, he blissfully jerked and came again and again until soon he was back up to three feet tall. His toes curled with orgasmic delight as he started to feel more and more incredible.
But meanwhile, upstairs, the two teens were not having such a good time...