11/20/20XX

The night after I took the….anti-shrink serum? Growth serum? I’m not really sure what to call it. Anyway, the night after I took it was agonizing. I’d eaten a huge dinner just before, I don’t think I’ve ever been that hungry in my life. Afterwards I was completely unable to fall asleep. It was as if I could feel every bone and muscle in my body and they were all experiencing growing pains. Max did her best to keep me comfortable, I spent most of the night using her large, cushiony breasts as pillows. It would’ve been nice, if not for the excruciating pain. Sometime around 4AM it became more bearable and was able to drift off to sleep. I woke several hours later in the afternoon, the girls having let me sleep in. 

As soon as I got off the bed I noticed I was bigger. Everything was still comically oversized from my perspective but less so. I wandered down the stairs and into the living room to find Max and Jenna trying to relax. I say trying because they were both hard as diamond and focusing mostly on ignoring their throbbing erections. Jenna saw me the moment I walked in, finally happy to find something else to concentrate on she jumped up to greet me.

“Hey sleepy head! How’re you feeling?” She squatted before me with a big grin across her mouth. “My my, look at you! You’re growing up so fast!” She teased. She was still more than a head taller than me and her rippling muscle only served to emphasize the physical difference between us. 

“How much did you grow babe?” Max had stood and was circling around behind me, looking me over like a lioness stalking her prey. 

“I dunno, a couple feet at least.” I said, shrugging my shoulders.

“Why don’t we find out, we can do us at the same time!” Jenna suggested. With that she grabbed me under my shoulders and lifted me as she stood. She carried me like a toddler down to the basement where she gently placed me in front of the tape measure. “You wanna do the honors Max?” She offered, stepping back. Max smiled and stood forward. She sat down, her legs stretching out on either side of me. Just like Jenna, she was still far taller than I was even like this. Sitting like she was her incredible cock had to be folded over her shoulder to avoid smacking me in the face and her titanic balls pressed against my lower legs and thighs, taking up all the space between us. She held one massive hand out over my head and leaned forward to see the number. Her breasts kept me pinned tightly to the pole.

“Looks like you’re 4’7”.” She leaned back and made a mocking pouting face. “That’s too bad, you’re still 6 inches shorter than I was.” When she said that all I could imagine was myself standing before her 20 days ago. Despite only being 5’1” I still had to look up into her eyes.

“And 9 inches shorter than me!” Jenna added. Now I saw her in front of me too. My little sister’s head cleared my own completely, the top of my skull not even reaching her chin. 

“Yeah, yeah I’m still a shorty. But at least I can walk around the house without having to climb the stairs like a jungle gym.” Max and Jenna exchanged knowing glaces. “What, what’s that for?” I asked.

“Well….” Max said. “You know how the ceilings in most of this house are 16 feet high? And how the doors are only 12 feet high?”  

“Yeah….” I had a feeling I knew where this was going.

“Well both Jenna and I are over 10 feet tall now and I still have at least 10 days of growing left. Sooo….we’re probably gonna have to move again, to an even bigger house. If I end up near 20 feet tall this place just isn’t gonna cut it.” Max sat back on her hands and looked down at me apologetically. I sighed.

“Yeah, I guess that makes sense. You really think you’ll reach 20 feet tall?” Max shrugged. 

“Maybe, I don’t see why not.” 

“Speaking of,” Jenna spoke up. “Why don’t we do you next Max?” 

“Yeah, okay!” Max smiled and quickly stood. Even though I hadn’t moved, the sight of her rising above me so quickly nearly gave me vertigo. 

Jenna held me in her arms while we measured Max. She was now 11 feet 4 inches tall. She was still growing slower than Jenna but she also had quite the head start. Not to mention her cock was a monolithic 8’10”.

“Damn, Max. You’re dick alone is nearly taller than the tallest man in recorded history!” Jenna said with admiration. Upon hearing this Max moaned softly and her cock throbbed eagerly. 

“Check again.” She said in a breathy tone. Jenna obliged. Both our jaws dropped when we saw that Max’s dick now measured 9 feet even. 

“How did you do that!” Jenna gasped. “I didn’t know you could grow on command like that!” 

“I can’t.” Max whispered. “I just wasn’t completely hard yet.” 

After we spent a few minutes marveling at Max’s recent growth, we switched to weight. 

“Why don’t we do you again, just to see.” Max suggested. Gesturing for me to step on the scale. The last time I was weighed on this thing my body couldn’t even activate it. This time I was at least heavy enough to do that. 

“74 pounds.” I said aloud. “That’s really light, even for some one as small as me.” I had noticed that while I had grown taller, I hadn’t filled out much and so was pretty scrawny. Obviously the human body wasn’t meant to go from 5’8” to 2’6” to 4’7” in less than two weeks. 

“Hey at least you weigh more than dad!” Jenna giggled. “Mom called this morning, apparently he’s down to 4 inches and less than a pound. Oh and she’s grown to 6’3.” She held her phone out to show a picture of our mom holding our dad in the palm of her hand. He was clinging to one of her fingers, which was longer than he was. I also noticed that mom seemed more than just taller, her figure had filled out as well. She was no longer a waife, in fact she could almost be described as curvy. 

I felt Max’s arms wrap around me and moments later I started rising. She placed me on her shoulders with my legs on either side of her head.  

“My turn, little guy!” She said as she stood on the scale. Jenna read the number.

“1,308 pounds, so that makes you 1,234 pounds Max. What a nice number!” She giggled. “Now do me!” She quickly switched gears to herself.

We already knew how tall she was, 10’2”, and how long her cock was, 46” or 3’10”. Her weight came out to 957 pounds, keeping up with her recent trend of packing on a lot of muscle weight. Upon hearing this Jenna had a suggestion. 

“Why don’t we have a little competition Max?” She pointed to the resistance trainer in the corner of the room. “Winner gets to use Trevor as a teddy bear for tonight.” I was about to say something but Max spoke first. 

“You’re on!” She cracked her knuckles and walked over to the machine. The last time I saw her use this machine she had benched 800 pounds. This time she started the base weight at 1000 pounds and set the modifier to 2x. She winked at me and then turned her attention to the bar. With no small amount of effort she heaved upwards, lifting the one ton weight high above her head. She let out a breath and then repeated the action. With every lift her cock throbbed and dribbled, creating a pool at the foot end of the machine. After 10 reps she placed the bar down and sat up. 

“10 reps at 1 ton, beat that!” She said confidently and stood aside for Jenna to take her place. Jenna just smirked and lay down. She looked over at me.

“Come here and set that dial to 4 times.” I stood in place. 

“You can’t be serious….2 tons? Are you sure?” 

“Absolutely.” She said flatly a small grin creeping around the edge of her mouth. I hesitated for only a moment before doing as she asked. Once the weight was set she licked her lips, gripped the bar and pushed. To even her own surprise, judging by the look on her face, she lifted the weight with little to no effort. She completed the 10 reps before glancing at me. I knew what she meant and turned the dial up to 4 tons. Now she was having a little trouble but was still able to complete the 10 lifts. But she didn’t stop. She kept lifting, a glassy look coming over her eyes. 

“Jen,” I tried to get her attention. “Jenna you can stop you won.” 

“Oooooh dear.” Max whispered and pointed. I followed her finger to Jenna’s rising cock. It had already been hard but now it actually seemed to be growing before our eyes. A pulsing heat started to emanate from Jenna’s body. I watched as her muscles started to bulge and expand in rhythm with her lifting. Her whole body started to lengthen before us. Short, sharp moans started escaping from her lips as she surged larger and her swelling balls started pushing her legs apart. 

“W-what’s happening?” I stuttered, stumbling back into Max’s thigh.

“I think she’s lost control, she can’t hold it in anymore.” As if on cue, Jenna’s back arched and she screamed in pleasure as she came. The weight from the bench press ripped from its confines and flew across the room. An inconceivable stream of cum pulsed from her penis, shooting all the way to the 20 foot ceiling and coating the fair wall. Max swept me up in her arms to save me from the rising tide. Jenna leaned forward to clutch her still growing cock as it flooded the floor around us. For what seemed like minutes she continued her orgasm until finally the last few gallons of semen dripped from her softening cock. 

Max was standing in a sea of cum nearly up to her shins. Considering that the room was as large as the footprint of an entire house this was an impressive feat. Jenna slowly stood, clutching her head. Both Max and I watched as she rose higher and higher before us. She seemed to go on for ages before her head impacted the ceiling. 

“Owie!” she said, rubbing her skull. Her voice was louder too, even just talking normally was as loud as a normal person shouting. “What happened, why are you so small?” She asked, still out of it. She was unable to stand up in the 20 foot high room and was looking down at Max and I bewildered. Her now soft cock swung in front of us, easily still as long or longer than Max was tall. “Oh shit...I came? Oh dammit I wanted to grow some more!” She stomped her foot in frustration, shaking the entire house. 

“I think….you’ve grown plenty….” I said carefully.

“What? I can’t hear you, you’re too tiny.” Jenna squatted down on her toes to get closer. Her hair fell around Max and I like a curtain and her hot breath nearly blew Max off her feet. “Oh wow,” Jenna whispered, apparently realizing for the first time just how much she grew. “I’m so big! And you’re so small!” She tried standing again, forgetting the ceiling. “Ouch! How high were these again?” 

“20 feet….” Max said, awestruck.

“Huh, interesting. I guess I’m one of the few cases that grow in one final spurt when they finally cum. It’s too bad though, If I’d managed to go the whole month I coulda reached 30 or even 40 feet.” Max and I looked at each other nervously. 

“Jenna how are you gonna get out?” Max yelled up to her. 

“Hmmm? Oh I have an idea but you might not like it. Remember how you said we were gonna have to get a new house eventually anyway?” She grinned widely. 

“You can’t be serious….” I said.

“Oh she’s serious.” Max replied, smiling as well

“Wait you’re okay with this?” I asked, truly lost now. Max just grinned down at me and then shouted up to Jenna. 

“Let us get out of the basement first!” 

“Okay! You have 10 seconds, one….” Max didn’t wait to hear the rest of the count down and sprinted up the stairs with me in her arms. We made it to the front lawn just in time to hear Jenna’s arms burst through to the first floor. There was more crashing and shattering as we looked in through the dining room windows to see Jenna heave herself up from the basement. Her hulking frame plowing aside furniture and walls like they were paper mache. A massive foot came crashing through the wall and onto the lawn in front of us. Max backed up as Jenna burst through the house to stand outside. She stretched, finally able to raise her arms over her shoulders. 

“Ahhhh! Free at last!” She beamed down at Max and I. “How’s the weather down there, former tallest in the world?” She mocked. 

“Oh just you wait! I’m coming for you!” Max grinned up at her. Then the two of them laughed together. I was still trying to take in what I’d just witnessed. A single thought crossed my mind and I spoke it aloud.

“Where are we gonna sleep….” The girls only laughed harder.    

Max’s Stats.

Height: 11’4”

Weight: 1274 Lbs

Penis Size: ?? flaccid, 9’0” erect.

Testicle Size: Large boulder. 

Jenna’s Stats.

Height: 20’+

Weight: ??? Lbs

Penise Size: 11’+ flaccid, ?? erect.

Testicle Size: Small Car.       

Trevor’s Stats.

Height: 4’7”

Weight: 74 Lbs

Penis Size: <1’ flaccid, 2” erect.

Testicle Size: Marble.