*GURGLE*
A rumble that shook the bed as Caitlyn's stomach began to shrink once more as her tits grew and an alarming rate. Ethan layed back and watched as his sister grew, in a matter of minutes, bigger than any measurable cup, bigger than your mother!
*CRACK!*
The legs of the bed gave out from the weight of Caitlyn's breasts. They were the size of bean bags. Caitlyn's breasts had also begun to lactate. Ethan and mom looked over at Caitlyn, she had passed out from extreme pleasure.
Ethan looked at his mother. "Did we over do it?"
Mom shook her head no. She crawled over to Ethan and started sucking on his dick. After a few minutes he could feel his balls filling once again with seed. After getting his dick hard again. Mom stopped sucking and stood up.
"I have decided. I want to be as big as your sister. I want to leak milk from my breasts like i did when i was pregnant. Your sister can have my room since it doesn't look like she is going anywhere. We are going go to the living room and you will fuck me until you empty your balls and. Make. Me. HUGE!"
Ethan follows his mother into the living room leaving Caitlyn to rest in the other room. Ethan with his now 2 foot monster and melon sized testicles following his mother who currently has breasts big enough to reach her knees. Mom pulls the ottoman away from the living room couch to lean over awaiting Ethan to empty his balls into her.
"Sink that python into me and fill me till you are shooting blanks. I want to grow bigger than your sister!" Mom said.
"I will mom."
Ethan walked over to her, grabbing her ass, and then slid into her waiting cunt. He fucked her as hard as he could, pushing his giant cock as far as he could. Her whole body trembled from his powerful thrusts. Ethan pushed his hips into her to fuck his cock deep inside her and let loose with a load of cum, filling her to the brim with his seed, his sperm was like molten lava. Mom's eyes rolled back in her head and she screamed.
"Fuck! I can't believe how hard you are cumming! Fill me with your young sperm and make me your whore!" Mom moaned, but Ethan did not stop.
He continued to fuck his cock into her, filling her womb. He turned her over on her side to face the couch, lifting her legs over his shoulders. He wanted to fuck her as deep as possible.
"That's it! I'm a slut now! I am a sex whore for your big cock!" Mom moaned.
Mom screamed as Ethan came inside her once more, letting her take all of his seed as it filled her womb and overflowed. He was pouring gallons of his sperm into her. His body trembled and then collapsed on top of his mother, pulling his cock from her with an audible sucking sound. They both breathed hard for a moment. His mother was now laying on her beach ball sized stomach filled with Ethan's seed. Mom turned around to look at her son, who was now covered in her juices. She licked them from his cock, and then smiled up at him.
"I knew I made a good decision to get the virus. You mad me huge, your sister massive and now I'm going to grow even bigger." Mom said with a grin.
Mom pulled him close, kissing him on the lips, "Thank you honey. Now fuck me in the ass as I grow!"
"Yes, mother."
Ethan spread her asscheeks and pushed his cock into her. Mom groaned, her cunt muscles spasming, and her whole body shaking. Mom had never been fucked in the ass before now. Ethan was the only person she had ever given it too. He pushed into her as deep as he could, burying himself inside her and then began fucking her ass as hard as he could.
"Oh fuck yes! Fuck my ass harder!" Mom moaned.
Mom was seeing stars now, her whole body shaking with his pounding thrusts. She could feel the pressure building inside her. Her whole body was trembling.
*GURGLE*
Her massive stomach began to shrink. Her already massive tits growing bigger by the second lifting her up as Ethan thrust deeper into her ass. She screamed. Her whole body was convulsing now. Her stomach had shrunk completely. Mom screamed as she came on his cock. The room filled with the sounds of her squirting juices as her whole body shook. Mom arched her back and pushed back hard onto his cock. Mom was still cumming as she felt Ethan's cock begin to twitch inside her ass.
"Yes! I want your sperm in my ass! Fuck me hard and cum in my ass!" Mom moaned as she continued to orgasm.
Ethan groaned, he began to shoot his massive load into her ass, filling it completely and then some. His huge cock swelled even more inside her. Mom moaned and came again, her whole body spasming as her breast grew to the size of bean bags. Mom pushed back onto his cock again as it began to grow larger. His cock was now 2 and a half feet long, as hard as iron and growing thicker.
"Yes! Give me your cock! Fuck me! Fill my ass with your young sperm and make me your whore!" Mom screamed.
Mom had been right about that. The virus did grow her and his sister big, but now her ass was filled with his seed and it was beginning to grow as well. Mom pushed back on his cock, grunting and moaning as her ass stretched even more to fit his giant cock. Her ass was now three times her original size, still growing. Her pussy was gushing, and juices ran from her pussy onto his melon sized balls, slapping into her pussy. Her legs began to quiver, her body trembled as she screamed out in ecstasy as her ass reached its limit. Her pussy was dripping. Her massive boobs slowing their growth, her nipples growing as long as fingers, becoming almost as thick as soda cans. Mom passing out from pure bliss. Taking his cock out, Ethan finding the couch, passed out as well.
Mom and Ethan both woke up, realizing that they had slept through the morning and most of the afternoon. The room was filled with Mom's massive boobs in a puddle of white liquid.
"Looks like I've been leaking milk" Mom said with a smile. "You were so good to me."
Mom was huge, her stomach had shrunk completely. Her boobs were now each the size of a large bean bag with milk running down them in thick streams. Her ass had grown so much, it jiggled with each movement she made.
"Well I need to check on Caitlyn." Ethan said. "I'll come back with a blanket and some towels for you"
"Thank you honey." Mom replied.
Ethan walked over to his now sister's room and pushed open her door. She was lying on her breasts in the middle of the room.
"Caitlyn? You awake?" Ethan said.
Caitlyn was watching the news. "Come in they are making an announcement about the virus"
"The scientists responsible for the virus have been busy with trying to make a cure. A cure has not been found but we now have means to reverse the growth effects from the virus. This will not prevent you from growing again, but can reverse any unwanted growth and can be readministered if growth occurs again. We...."
"You know what this means Ethan? We can do this over and over again as much as we want. You can make us as big as you want and we can make you as big as we want." Caitlyn said, grinning at him.
"Well that opens up some possibilities as I was able to make mom's ass grow last night after you passed out" Ethan said.
"You what?"
"I fucked her ass as it grew bigger. She really enjoyed it"
"Well it cant hurt to have a little more junk in the trunk" Caitlyn said
The End?
