A prelude to the real action

Heather's tongue probed Adam's mouth, and she was surprised to notice the rapid and complete dissolution of the Growth X pills upon contact with Adam's own cum.
The result was a thick liquid, unbeknown to her with an insanely high concentration of the chemical agent. Compared to the digestion of pills, this liquid solution allowed for an far easier and much faster absorption of the **** into the body and at the same time it increased the potency even further. Much further.

This Growth X filled cum cocktail was not only extremely potent, but also highly arousing and possessed a very pleasant flavor, so Heather could not resist to taste some for herself. After she tried to make certain that Adam swallowed the majority of it, she broke off the kiss and eagerly gulped down the mixture that had remained on her tongue and in her mouth, leading to yet another small orgasm that rippled through her body. Meanwhile Adam's body started to absorb this massive overdose of Growth X, and his transformation began immediately.

Among the first things to change were his conflicted feelings about his own ejaculate. Adam was no longer disgusted at all that he had been **** to taste and swallow his own cum. He was no longer grossed out by the huge amounts of his own jizz on his stomach, chest and his face. Quite the opposite. He now relished everything there was about his sperm. It was a special part of him, a source of incredible pleasure, energy and power. Wherever the gooey substance ran slowly over his skin, it tingled with excitement and electricity, whenever he tasted more of the intoxicating nectar, a shiver and wave of arousal ran down his spine. He also no longer felt inconvenienced by the seed threatening to flow in his eyes, which were now wide open.

Adam could feel the approaching transition throughout his whole body. With it came a tension building in all of his muscles, and despite that his previous climax was just subsiding, his cock was still more than fully hard, even painfully so, and it gave him and undeniable lust and urge to fuck Heather. Looking at her, he saw that she was still down on her knees. Her all natural breasts were quite a sight, and now that they were glistening wet with his generous amounts of his jizz they appeared even bigger than before. Was it possible? Or was it just an optical illusion?
If they should really have grown, Heather herself gave no sign that she was aware of it. Her gaze was fixed on his manhood, and her focus on his member with a mix of the zeal, wonder and curiosity. And her urges and thoughts were all too similar to Adam's own: Had his rod improved in size already? Did his balls look like they were expanding? When was he finally going to man up and fuck her? Lucky for her, she didn't need to wait much longer.

With a confidence and determination that Adam never had before, he rose up from his bed and pulled Heather into a tight embrace. The teens warm bodies, both slick with the thick juices. His tremendous erection pushed against her stomach, the engorged tip even reach the underside of her bountiful breasts, which in turn pressed against his upper body. Adam lowered his head and locked lips with Heather, his tongue soon wrestled with hers, while he let his hands roam all over the backside of her body. Tracing a path from her plump booty, over her womanly hips, along her spine and up to her neck, before they returned back down to her ass. Did her cheeks already feel fuller, rounder? Was there more to hold onto? It was then that Adam surprised both of them with a strength that he certainly did not possess before. He grabbed onto her waist and lifted her up as if she weighted nothing, only to put her down again, with her back laying flat on the the bed.

The woman in heat quickly discarded her skirt and her panties, so that the only pieces of clothing which remained from her school uniform were now her pumps and knee high white socks. Spreading her legs to display the invitingly wet folds of her womanhood, Heather eagerly looked up at Adam, desperately awaiting his next move. Adam's cock had definitely already started to grow, it was now certainly longer than a foot. But this was not the only pleasant change. Adam's whole body had started to transform. Where before the nerdy teen had an average body, thin, without fat, but also without any definition or muscle, Heather now could see a hint of a six-pack on his stomach. His arms, legs and torso took on shape and certainly started to look slightly more sturdy and robust. Although her focus of course remained on his now more than sizable and still enlarging shaft, it was the first time for Heather to look at more than just Adam's package. She truly liked what she saw, and it only increased her need and arousal. But it also instilled in her a sense of urgency. What if Adam had been right? What if his penis would indeed grow so big, that it would no longer physically fit inside her? Was this going to be her first and only time to be fucked by the cock of her dreams?

"I want you, Adam. I want you like never before. I want to feel your incredible fuckstick inside me. Go on Adam. Go on and fuck me!"

Adam in turn looked down at Heather and let his eyes roam all over her body. He was now certain that her breasts indeed were expanding, because they had gained quite a bit of mass already. And it was the same with her ass. It had not been just a fiction of his imaginations that her bootylicious bum was indeed setting new records. But how was this even possible? Had she taken some of the Growth X as well? Whatever the reason for this more than pleasant turn of events, it didn't matter anymore, did it? All the pills were gone, and whatever was going to happen, was going to happen. All they could now do was to embrace it. And Heather had made her choice: Her hands tightly gripped the bed-sheets in preparation for what was about to come.

"What are you looking at, Adam? Common, fuck me already!", Heather exclaimed again, unable to comprehend why Adam was wasting precious time. Time that could be used to experience the most exiting and fantastic sexual adventure of their lives.