Sean was always the strange one at school. He was the major class geek and the fact he was more than a little overweight did not help the fact. He usually spent his time working on some extra projects or doing some work on a secret project he liked. His favorite project was a new growth hormone that would help midgets to grow to a normal size. Of course since he was only in grade twelve he could not get sponsorship or anything like that.
One night as he worked on the formula the phone rang and a voice came over the phone that Sean always liked to hear: Lisa. Even though he tried to deny it himself he did have a secret crush on Lisa but he was not her type. Not to say that they were not friends but rather that they both preferred it that way.
"Hey Sean, I was wondering if you could help me with some math tonight? Maybe I could come over to your house, if that's all right."
Jumping at the chance to spend time with her, he eagerly agreed. Soon after he was cleaning up his mess when he decided to run his experiment once more. He quickly found an old water bottle (he couldn't afford flasks or anything because he was on a tight budget) and placed it under the end of the distillation apparatus. Satisfied that the machine would do the work itself, he went to go prepare for Lisa's arrival. She arrived about ten minutes later and he went to the door to greet her. Like always she was wearing a tight T-shirt that showed off her average B cup breasts. Quite enthralled by this he invited her in and asked her if she wanted a drink.
"Sure, Sean. Um...I was having this problem with these stupid functions and I know that you're good at doing them, so could you help me?"
"Hey," he replied, "that's what friends are for, right? Now I just need to go and run to my car and grab my books. Why don't you go downstairs and set up at the table. Ok?"
"No prob." With that Lisa left to go downstairs and Sean went to the garage to get his backpack. He returned to hear Lisa calling up the stairs. "Hey Sean, I left my pop up there, could you get it for me on the way down?"
"Sure thing."
"Oh, do you mind if I have a sip of your water bottle?"
"Um...yeah go ahead but make sure it only has water in it. I was using one in my room today," he called back as he came down the stairs.
"Don't worry I found this one out here," as she gestured to the tap that Sean used for a water supply for his experiments.
"Good, now let's talk about your problem here." As Lisa drank for the water bottle Sean asked if he could have a sip and Lisa nodded instinctively. They continued to work for several hours until Lisa noticed the time and had to leave. "I'll see you tomorrow at school, Sean. Thanks for the help!"
As she left, Sean felt a little woozy and decided to put in for the night.
Sean awoke the next morning to a feeling of light-headedness and still felt a little drowsy. Slowly he got up and walked over to the shower where he always woke up. After he finished showering he went to get dressed and decided to wear the average shorts and a T-shirt because of the weather. As he went to do up his shorts they seemed a little loose. Guessing it was just him; he continued his daily routine. As he walked to the kitchen he felt as though he was walking on air, like he was lighter or something. He approached the fridge and leaned down to grab an apple from the bottom shelf he noticed that his crotch seemed heavier as he stood back up. Intrigued by this occurrence he decided to see what was going on. When he reached the bathroom he dropped his pants and boxers and stared in disbelief at what he saw. There in front of him his old penis had grown from its small five inches to a huge ten inches and it seemed to be over two inches thicker than it used to be. Not only that, but his balls were nearly the size of two good-sized oranges. There he stood for a few moments before he regained his composure. He knew he would have time to investigate this later but now he had two important tests to write.
At Lisa's house she woke up to a similar phenomenon. She could not believe what had happened overnight: she had grown from her previous B cup to a magnificent D cup. She just could not believe it! Also, her formerly thin body seemed to have spread out and now instead of a frail little girl she felt like a new woman. Then she remembered, it was another school day and if she skipped another class she would be expelled. Before leaving, though, she decided to pay Sean a visit and ask him about this. After all, he was the science whiz kid.
At school both Sean and Lisa seemed to draw the attention of the student body, Lisa because of her new found endowments and Sean because of his now much more slender looking stature. The time at school went by quickly and so Sean simply went home after school to study his metamorphosis. When he returned to his custom built lab he looked around and thought something was missing... THE WATER BOTTLE!! He must have finished with it and left it out last night before Lisa came over. "Oh God," he thought, "Lisa must have drank some of it...wait, I had some, too." he glanced down at his crotch and thought of the effects of the solution on Lisa.
Lisa got home and ran to the bathroom. She tried to unbutton her shirt, but the buttons were being drawn too tight and the sheer bounce of her breasts made it hard to even grasp one single button. When she reached the bathroom and inhaled a large breath the shirt strained with the pressure of her breasts inside and then button after button began to snap and within a minute she stood in front of the mirror staring at her FF size tits waving in front of her. "I have to get to Sean's house before I grow again." was the only thing that came into her mind. With that she went to her closet and pulled out her big sweatshirt and pulled it down over her breasts. She ran (or at least tried to run) out the door and headed down the road to Sean's house.
Sean began to work on an antidote to the formula in his lab when the doorbell rang. "It's open!!" he yelled up the stairs to the guest that he really didn't have time to talk to.
"Sean? Are you home? It's Lisa, I'm afraid I've had a slight problem and I need your help!"
Sean's eyes looked up suddenly, "Lisa, come down to my room right now!"
As Lisa tried to walk down the stairs to Sean's room, her breasts were starting to grow again... slowly but surely, growing. "Since last night I've... well... had some developments," she said as she entered Sean's room where he was fumbling with some sort of solution. He held some sort of solid over his head as he turned to face Lisa and then just stared in disbelief at her now GG cup chest that was pounding out towards him through a now very tight sweatshirt that did anything but hide her endowments. As he stared he did not notice that his grip on the solid was slipping and as it fell to the floor he came out of his trance and quickly picked up the solid and put it in a liquid and faced Lisa again. "What... I mean... wow!"
"Yeah, I know, I know. Now what happened to me?"
"Oh, um... you see I was trying to find this hormone that would make shorter people taller and I guess by accident we both had some."
"Both of us," Lisa asked as she tried to size him up to see what changes, if any, he went through, "I don't see that you've changed at all. Well, you do look a bit more fit and all, but I mean what about me?"
"Calm down Lisa, I'm working on an antidote right now so if you leave me alone I can try to..." as he talked to her, he did not notice that the flask which he now was holding had spilled some liquid on him. "Damn it!! Great, now I spilled it, just fucking great!" Then, as if on cue, he felt a surge in his pants near to the area he spilled the chemical on, his crotch. As they both watched his pants seemed to fill with what seemed like water as it just kept filling and filling until it looked like Sean had stuffed two cantelopes and a huge stick of salami down his pants. Feeling very uncomfortable he began to undo his zipper when he realized Lisa was simply mesmorized by the swelling in his pants. "Um... I'll be right back, Lisa. Don't touch anything!" She simply nodded and he walked to the bathroom. Once there he quickly undid his pants and looked at what had happened. His previous cock had grown to almost 18 inches in length, and added another inch and a half in thickness.
He quickly pulled his pants up and walked out of the room and then a new wave of sensations began to wash over him. He knew that he was changing and he could not stop it but if Lisa saw this she would... well... be freaked out and he would never see her again. He walked into his room to find Lisa was gone. "Damn! Where is she?" As he spoke there was a small wail from upstairs and Sean ran up the stairs to see what was going on. There Lisa was in a corner of the kitchen crouching down on the floor and when Sean tried to approach her she stood up. Sean was amazed to find that Lisa had grown to over 6 feet tall and her body was a perfect hourglass figure with all the things a man would ever want.
"Sean... what happened to me? I came upstairs and then I began growing and now I... I look like some sort of Amazon or something."
As Sean stood there listening to her, he did not notice that he was also going through some changes. Then he felt it. A sharp pain plunged into his chest and the small gut that he had was being replaced with a rock solid six pack. Then his arms began to enlarge. His shirt became increasingly taut as his chest muscles also grew. Soon the shirt was ripped to shreds as his upper body blasted out of his shirt. Huge rippling muscles sprang up all over his body.
"Oh GOD!!!" Sean yelled in very deep voice, "What is happening to me?!!" At that instant his shorts burst as his now huge thighs tore the fabric and left nothing but his underwear showing.
During all this Lisa was transfixed on Sean's now monstrous cock. She estimated that it had to be at least 25 inches in length and his balls were the size of volleyballs and the underwear did nothing to hide this.
Then as suddenly as it had begun, Sean's transformation ceased and there he stood at 6'9" and a body that Mr. Universe would be jealous of. "I think it stopped," Sean managed to stutter. Then as he looked up at Lisa after surveying his new body he caught a glimpse of the goddess that now stood before him.
"Oh God, Sean, you're huge. Your dick must be so constrained in those little jockeys... let me help you." With that, Lisa tore away Sean's underwear and his gigantic cock rolled out. With one quick motion she grabbed the now 32" erect member and slipped it into her mouth and gave Sean the best and first blowjob of his life. As he came Lisa fought hard to take it all in but it was no use as gallon after gallon of hot cum overcame her and she had no choice but to let go.
"Oh... that felt so good," Sean muttered "Now let me take you for the ride of your life." Now Sean tore off all of Lisa's clothes and for the first time looked at her huge cunt. Thinking for a moment he slowly slipped his manhood into her with great ease. Thinking that he could not satisfy her, Sean quickly ran downstairs and washed his dick with the formula that he spilt on himself earlier and ran back up to Lisa where she was sprawled out on the floor and he re-entered her. As he entered her she moaned and then he felt the formula start to work. Soon Lisa's moans became deeper and more enthralled as Sean's penis began to once again grow, only this time the growth happened inside her huge cunt. As they fucked Sean was surprised to note that he barely could fill her giant hole.
Nearly twenty minutes later the couple collapsed, exhausted from the most sensual and longest session of sex they had ever had. As Sean pulled out of Lisa they were both astounded to see that his cock had grown to 40" in length and 20" thick. Lisa's cunt was blistered and red after taking in the largest dick anyone had ever seen and fucking the most muscular man in the world.
"Jesus, that was incredible sex, Lisa. And look," as he gestured to his godlike manhood, "I'm still hard."
"Well I guess I'm going to have to fuck you until it's not hard, now won't I?"
And so the two moved to the basement and began to fuck. It was almost seven hours later before the monster cock began to subside and they rested until they decided to fuck again... ten minutes later.
Two days later at school all the students were astonished to see a girl who had the biggest tits anyone had ever seen and a guy who was built like a god, and hung like one too. Sean never had problems with bullies again and Lisa never had to worry about finding a bra because there wasn't one big enough to fit her. The couple was soon married and on their honeymoon. They did nothing but have sex for two weeks straight. The formula and the procedure were destroyed a week later and never seen again. Unfortunately the formula was disposed of in the water supply and the whole town went through a growth spurt for some reason. The police never caught the culprits who caused this phenomenon.