The events of that night were definitely pretty unusual, with Molly eating so much food and you noticing her recent development, but you quickly forgot about it when you went upstairs and began playing video games. Time flew by and before you knew it, it was 2:00 AM. You took off your headset and went to the bathroom to take a piss and get a drink of water before bed.
While you were there, you head a weird noise coming from Molly's room. It sounded like heavy breathing. You pressed your ear to her door, trying to listen, and leapt back in disgust when you realized what she must be doing in there. No brother wants to imagine his sister pleasuring herself, though a part of you was intrigued. Her bed was making creaking noises, when all of a sudden the breathing and creaking stopped. Maybe she knew you were listening! You went to bed and slept late the next morning.
You saw that Molly's door was shut when you got up and it was still shut when you went down for lunch. Seeing it still closed at 3:00, you decided to knock. It was unlike Molly to be shut in her room all day and maybe it had something to do with her being embarrassed about you hearing her masturbating the previous night.
"Are you planning on joining us humble mortals today?" You heard the bead creak and the sound of footsteps approaching.
"Tim, I don't feel so well."
"Oh. You want me to get you some medicine?"
"No, I'm not sick. I'm just...."
You tried to open the door but found that it was locked.
"Molly what's going on?"
"Promise you won't freak out, okay?"
"Fine. I promise. Will you just tell --" You were cut off as the door opened and you saw your sister standing there.
Well, it looked like your sister, except she was a half a foot taller than she had been the night before and now had a pair of real boobs, probably about a c-cup. She still had on the tank top from last night, though now it looked more like a crop top than anything. You looked up and down her body while she scanned your face, searching for a reaction to her growth.
"H-how did this happen?"
"What do you mean?" she teased, winking at you. "Come inside. I'll explain."
She pointed to her bed and you sat down, while she went over to her drawer and pulled out two little pill bottles. You couldn't help but notice that her rear had grown into a nice little bubble butt. If she wasn't your sister, you'd seriously be eyeing her up.
"So you remember my field trip to the chemical plant last week? Well, I brought home a few souvenirs and lets just say, they weren't from the gift shop."
"You mean those pills are from GrowTech? That's how you got so much..."
"Bigger? I mean, can you blame a girl for trying? I've spent my whole life as a pipsqueak, underdeveloped and neglected by the puberty fairies. When I heard that they had a product to make you grow bigger, I jumped at the opportunity." "But Molly! You don't know anything about these pills, I mean the dosages, side-effects, consequences!"
She shrugged and stretched her arms up to revel in her new height. "Maybe, but I feel fine. Fantastic, actually!" She gave her boobs a little pat. "Not complaining about these either." She saw you blush and smiled coyly.
"What will mom and dad think when they learn their daughter has taken experimental growth drugs."
"That's the least of my concerns right now. Right now, I'm thinking about the fact that I'm starving. Growing girls gotta eat, you know! Why don't you go get me some food?"
"This isn't a restaurant, get it yourself!"
Who did she think she was, bossing you around like that? Molly looked upset at this response and scowled. She started to leave the room but turned at the last second.
"I'd start being a little more respectful to your 'little' sister, bro. I have a feeling I'm not done quite growing yet," she said with a smirk. And with that, she left the room and images of a taller Molly filled your head. The thought turned you on, you had to admit, but it was still terrifying. You had to find a way to get those growth pills from her. Before she took it too far....
You were in a state of shock at what had happened. How could this be? Your sister growing 6 inches and a pair of boobs overnight? This went against everything you ever thought possible or believed about science. It was incredible, it was terrifying. Most of all, it was intriguing. You wondered if the GrowTech company knew what kind of product was on their hands and your mind raced thinking of all the applications it had. Soon, there would be no more short people as everyone would want to grow bigger. The NBA would probably be dominated by people taller than the hoops. But you were getting ahead of yourself. For now, there was only one person that mattered -- Molly.
You had to find a way to get those pills back from her. She was already a little crazy but there was not telling what she'd do if it meant she could grow bigger. And you had no idea if the pills were addictive or anything.
You crept downstairs, where Molly was absorbed by the fridge, looking for stuff to eat. Her butt swayed back and forth and you felt embarrassed by the boner growing in your pants. She had a great-shaped ass, it was a shame she was your sister.
You looked on the counter but the pills were nowhere in site. Suddenly, the fridge door closed and Molly smiled at you.
"Looking for something?"
"Uhhh..."
"It wouldn't happen to be *this* would it?" She asked, holding up the pills.
"Actually, yeah. I think you should stop taking those, Mol. They could be dangerous and as your big --"
"Big brother? Hm. Mayyybbeee for now, but certainly not for long. Especially since I just took a double dosage of both pills. Mmmm I think I can feel a growth spurt about to come on. Wanna watch "big" bro? Don't think you'll be able to contain yourself when you see these tits get even bigger."
She smirked and looked at your boner before wolfing down a slice of pizza and burping loudly.
Her eyes glittered and she kind of tensed up.
"Are you okay?" you asked.
"It's.. happening... again..."
You were amazed as you saw Molly slowly began to inch upwards. Her bare feet slowly grew bigger, as did the rest of her. As she grew bigger, she seemed paralyzed, stuck in place. Her eyes were transfixed on the ceiling and she looked completely unaware of her surroundings. You saw her breasts swell, they were the size of tennis balls now and getting bigger by the second. Her nipples were hard and they made two noticeable protuberances on her ever shortening tank top.
Molly stood just below your eye level now. She was probably 5'10'', while you were 6'1''. She had a bit of cleavage showing and her boobs were probably a D cup. She snapped out of the trance she'd been in and ran her hands over her new body, spending a few seconds hefting her tits and squeezing them.
"So, Tim. What do you think of the new me?"
"This is crazy...."
"Mmm I know," purred Molly. She turned around, showing her plump ass that was stretching her shorts to their limit. "I think this thing is big enough to twerk with now, don't you?"
"C'mon Molly, what the fuck. I'm your brother."
"Awwww does my body make little Timmy uncomfortable? Get used to it, if I have things my way I'm gonna be parading this ass and these tits all over town. No boy will be able to resist me. You might be hearing a lot of noise from my room at night, don't let it keep you up. Or do. You seem to enjoy hearing your sister being pleasured."
You were left speechless and even more dumbfounded when Molly extended and hand and patted your raging boner. She grabbed it and leaned in to your ear, whispering,
"Whatever I want, I get. I want you, I'll get you. I want food, you'll get it. I want to grow? I'm going to fucking grow. Got that?"
Her hand was tight on your dick and you felt her nails starting to dig in. Her eyes were looking up at you but you knew it wouldn't be long before you were looking up at her.
"Got it," you whimpered. "Can you let go, Molly?"
"When I want to. You're bigger than I thought, Timmy. Or maybe your sexy sister is just part of that."
She let go at last and took out the pill bottle, tossing back a few more. She laughed, seeing your expression, and went up to her room, slamming the door and playing music loudly. An hour later you got a text telling you to bring her some food and leave it at the door. You initially got mad at how bossy Molly was being, but you remembered what she'd said to you. Might as well give her what she wants, you thought.
You left it outside, as instructed, and went to bed. That night, dreams of Molly filled your head. Nothing prepared you for the changes that would come.
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