Kim's Pussy

By: Giantesslover

Alice smiled as she gently pushed the tip of her condom covered cock, and you, into Kim's hungry pussy. She slowly inched her way in, causing Kim to moan. Even though she was **** to let her little sis fuck her at first, even annoyed by it, she couldn't deny how good this felt. Alice leaned up and began to kiss her sister's neck, and reached around, gripping her breasts gently.

"Kimmy...could I get another dose of that stuff that made me and my Cock bigger?"

Kim moaned, and grit her teeth a little. Their friend in the science lab discovered a special serum that allowed girls like her and Alice to grow. She had given a little bit to Alice last week since she was shorter than she should have been, pushing her from 4'6" to 5'2" which shocked their mother to see her daughter grow 8 inches overnight. Though...she couldn't argue with the results it had on Alice's member. The younger girl was barely an inch hard now she was pumping 8 inches into her pussy. She turned to Alice, curious.

"H...how much bigger did you want to grow?"

Alice smiled, as she pumped her cock against that special spot of Kim's pussy. You grunted as you felt yourself whipped forward. She knew as long as she pumped against that spot, she would get her way. Alice kissed Kim and shocked her with her request.

"mmm....I want to be bigger...than you sis"

Kim gasped. She was 5'10" and that was after taking some of the Serum herself... but then she felt Alice rubbing that spot in her pussy and she couldn't bring herself to say no. Inside, you continued to frantically claw at the latex of the Magnum condom, hoping for freedom. Hearing their plans outside, you knew if this was true, you wouldn't survive your younger sister's cum cannon. You then feel your prison lurch back and forth again, as Alice began to pump again.

Kim prepared the dose... measuring and mixing as per her friend's instructions. She also looked back at Alice's B cups and decided to add a bit extra to the drink. She then handed it to her sister who promptly drank it and smiled.

"Here I grow Kimmy!"

Alice began to pick up pace as the potion did its work. She moaned as she felt her body on fire as it started getting bigger. You gasped as you saw her dick growing larger inside the condom and taking up more room. Alice herself gasped as she saw and felt her own breasts swelling larger on her chest. Bigger and Bigger the young girl grew, pumping harder and deeper into Kim as you felt yourself **** into the tip of the condom, the place where all the cum would be gathered as her massive cock grew even more massive.

Finally Alice's growth was slowing down. She had grown over 2 feet taller, and her cock was now 15 inches long and stretching Kim pretty good. Her B cup breasts had engorged to G cups. She pumped as she continued to inch up a bit more, groaning as her cock began to pulse and throb, her heavy lemon sized balls slapping against Kim's thighs. You gulped, seeing the head of the beast in the now stretched condom open and close, thinking THAT would be the moment you died...drowned in your own sister's sperm.

The growth finally ended, leaving Alice at 7'7, H cups, and with a 15 1/8th inch long cock. She groaned as she pumped harder and faster. You frantically clawed at the tip of the condom, trying to break the latex but it wouldn't give. The head of Alice's cock was big and purple, and she gave one more mighty thrust into Kim, making her orgasm, clamping tight around Alice's cock. You back up to the back of the condom, trying to get away from what's coming.

Alice groaned as she began to cum, shooting out what seemed to be gallons to you, flooding the condom. You tried to swim to the top, but another blast filled the condom even more. You were quickly running out of air, hoping Alice remembered you and didn't let you drown as she blasted another blast of cum into the condom, making the condom start to inflate with the amount of cum inside.

You were gasping for air, swimming in the slimy cum when.....