Down in the basement, Joe started testing his latest project: a serum to stimulate growth. Once it was perfect, he planned to have some fun with his girlfriend Erin. He was concentrating it so a dose would make her more than 10 feet tall, and give her a few more cup sizes. Joe grinned at the thought.
Human consumption was still a ways off, though. Humming cheerfully to himself, Joe sat down at his work bench in front of the flask full of blue liquid, and started to prepare cell cultures. He was going to test the serum with the cultures today, observing their rate of division under the microscope. As he drew the serum into the pipette, he hesitated. Hadn’t he synthesized two flasks of the formula?
Joe glanced around the lab. He didn’t see another flask. “Must have only thought about brewing two batches…” he muttered, and went back to work.
A couple of minutes later, Joe heard the door at the top of the basement stairs open and close. He looked up from the microscope eyepiece to see Erin strolling down the stairs. She looked like she had come from working out. She was wearing an old yellow t-shirt and some yoga pants that hugged her toned thighs and calves in a very flattering way.
“Hey, you!” Joe said, greeting her with a smile.
“Hey, yourself!” Erin came around the workbench and gave Joe a peck on the cheek. “You can hug me, but I’ll warn you now: I’m sweaty.”
“Never stopped me before,” Joe said. He got up and gave her a hug, along with a deeper kiss. “Although that’s usually when I’m the one helping you work up a sweat.” He winked.
Erin giggled, then gestured at the workbench. “Whatcha working on?”
Joe sighed. “A blend of steroids and hormones designed to stimulate musculoskeletal growth along with development of secondary sexual characteristics.”
Erin’s face lit up. “So it’s a growth formula? That will make my boobs bigger?” She glanced down at her flat chest, then wrapped her arms around Joe. “Joe, that’s amazing!”
“It would be, if it worked.” Joe growled in frustration. “The way these cell cultures are reacting I might as well have dosed them with water.”
“Oh, well. Breakthroughs take time. If you ever need to use any of the equipment in the bio lab on campus, let me know.” Erin was a biology major, and had ready access to the lab at the local university. “Speaking of growing, has Megan hit her growth spurt already?”
Joe raised an eyebrow at the odd change in topic. “Uh, not that I’m aware of. Why?”
Erin shrugged. “I saw her when she let me in. She looks like she’s grown since I last saw her. She’s wearing clothes that are at least a size too small.”
Joe rolled his eyes. “And Mom just bought her some new clothes. Megan tends to wear things to death. She has a Star Wars shirt that I swear will disintegrate the next time Mom washes it.”
Erin laughed. “Well, tell your mom it’s also time to get that girl a training bra, at least for the padding. If she keeps wearing these tight t-shirts anyone chest level with her is liable to lose an eye, especially if it’s cold out.”
Joe blushed. “Uh, that’s not something I really, uh, think about. And I think my mom would be more concerned about my interest in my little sister’s underwear than she would be about her modesty.”
Erin laughed at her boyfriend’s discomfort, then stopped abruptly when a loud crash came from upstairs.
“Huh?” Joe said. They both looked up at the basement ceiling. There was another crash.
Joe went to the bottom of the stairs. Erin followed him. “Megan!” he yelled up the stairs. “What’s going on?”
Megan didn’t respond. Instead, a loud groan came from the ceiling.
“What the heck?” Erin said, edging up the stairs. The ceiling groaned again, louder this time.
“Uh, Joe, maybe we should head upstairs.” Erin sounded scared.
“Uh, good idea,” Joe said, as the ceiling creaked again. He started to follow Erin up the stairs. Cracks had started to appear in the ceiling. What the hell was going on?
Suddenly Joe stopped. “Wait!” He ran back to the workbench and grabbed the flask of (failed) growth serum, then rejoined Erin at the stairs “Don’t want to have to start all over again,” he explained in response to her raised eyebrow. “Plus, it needs to be refrig-“
Before Joe could finish, the entire ceiling caved in. Erin was the one facing the basement lab when the collapse happened and caught a glimpse something huge and pale tumbling into the basement with the roar of breaking timber and masonry along with another sound she couldn’t identify. She was trying to peer through the cloud of dust and debris when Joe knocked into her, sending her to the ground with him on top.
“Joe!”
“Sorry! I was, uh, protecting you.”
“Uh-huh, my hero,” Erin said, unconvinced. She tried squirming out from under Joe. “Get off me!” Erin might have taller, but Joe was still heavier.
“Sorry! Sorry! Getting up.” Joe started scrambling to his feet, then paused. “What the hell is that noise?”
Erin paused, concentrating on the weird noise from earlier. Now that it wasn’t competing with the sounds of the house’s destruction, it sounded familiar, almost like…
“Laughter,” Erin said. It was a really loud, deep laugh.
The two finally scrambled to their feet and looked back into the basement to see the extent of the damage. What they saw wasn’t what either was expecting.
“What the fuck?!” Joe cried while Erin shrieked.
Sitting in the middle of the basement was an enormous young woman, sitting butt naked and Indian-style on the ruins of Joe’s lab. All of Joe’s carefully curated apparatuses and chemicals were crushed under a pair of solid thighs and an enormous, well-padded ass, which in turn supported a fit and trim torso, just scaled up tenfold. Above the smooth, pale expanse of the girl’s stomach hung two gigantic breasts, each capped by rock hard nipples the size of pop bottles. Beyond those fleshy mountains, nothing was visible; the girl’s upper chest, shoulders, and head were protruding through the floor of the house’s first level. Joe figured if she stood up, the young woman would be more than 30 feet tall! That would make her taller than the whole house.
The colossal breasts bounced in time with the girl’s laughter, as her stomach flexed and heaved with each guffaw.
“W-w-w-what?” Erin stammered. “W-w-who the hell is that? What’s going on?!”
Joe just stared, mouth agape. Then his eye’s widened in realization. “I knew I made another batch of the growth formula! It does work! But the only one who could have taken it…is…Megan…oh shit.
“Joe, that is not a 7 year old girl,” Erin snapped. She waved a hand at the giant’s enormous tits, still heaving with mirth. “Look at those things! They each weigh more than the two of us put together!”
“Yeah, well, in addition to making someone grow, the formula was designed to enhance secondary sexual characteristics. In, uh, it’s intended recipients-“ Joe poked Erin in the chest “-that mainly meant breasts and hips.” Joe looked back at the colossal woman more than filling his lab. “In a pre-pubescent, it looks like the formula causes rapid onset of puberty- very extreme puberty- in addition to the increase in size.” Joe grimaced. “But there’s only one way to know who it is for sure.” He cleared his throat. “Uh, Megan? Megan, is that you?”
The laughter died down. “Joe?” the giantess thundered. “Joe, is that you? Where are you? Isn’t this awesome?! And it feels soooo good!” One of Megan’s hands made a few tentative strokes in the thick patch of hair between her legs.
Joe blanched. “Oh, god, we need to get up there!” He started up the stairs. “C’mon!”
Erin, meanwhile, was staring at the flask of growth serum that Joe was still carrying. It worked! Joe’s disturbingly hot, three-story sister was proof enough of that. And if it worked for Megan it could work for her. She would finally be able to live out her fantasies, and have honest-to-god tits to boot! Erin licked her lips. She was sorely tempted to grab the flask of formula and chug it then and there, but maybe they should check on Megan, first.
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