A few seconds passed as the Chronivac got ready. Lucy had told Emily to relax, but to tell the truth, she was nervous as well. Soon she would be another gender entirely and over twice here age at that. But she made here decision and it was probably to late to change it. And then, as if to help her along, the Chronivac flashed and began to scan the two sisters. They both felt ticklish, and as the scan continued, more then that. Lucy could feel something vital within her change. Something that told her, there was no going back. And just like that, the scan ended. "Changes Initiated..." the Chronivac said. "Lucy?" Emily looked up to her sibling. "Here it comes..." After a few seconds later, the screen now said, "Changes Starting..." "Brrrr!!" Lucy and Emily shivered and then their bodies started to heat up. "Lucy?! Ah!" "Emily! Ahh!!" The two siblings called out to each other as they started to grow. Lucy was going through her growth spurt quicker. She shot up nearly a foot in just ten seconds. Emily was practically starting at her crotch area as it started to get hairy. Emily then started to grow up faster, becoming eye level to Lucy's chest, which was likewise growing some hair.
"Ahh! Emily!" Lucy watched as her little sister hit her growth spurt. Looking down at her own body, she could see the body hair growing bit by bit. Emily had none so far, save for the pubic hair. "Lucy! Woah!" Emily watched as her sister's hair sunk back into here scalp. Her face was losing it roundness and getting rugged. "Oh my god! All this hair!" Lucy exclaimed as her body hair kept growing and growing that Emily thought it was coming from the hair she was losing on her head. As Emily hit about nine years of age, Lucy was now about preteen age. Her upper body shifted. Slabs of meat were growing on her chest and stomach. She felt her stomach as each more slabs of meat were forming on it. Four, six eight. She traced her body down from her stomach to her very hairy crotch as she hit thirteen and then was hit with an unknown force from within.
"Gah!" Lucy yelled as she fell to her knees. "Lucy!" Emily move towards her sister, clearly worried. "Agh! My body! It's burning!" "OMG! Lucy, your voice!" "My voice?! Ahhh?!! Owww..."Lucy's voice was getting much deeper, but she was too focused on something happening much lower. Her crotch was hot as heck and she could feel something trying to spring out from her open hole. "Emily! Emily!" Lucy could only call her sister's name. Emily watched as her sister kneeled in pain and something start to worm its way out from her upper hole. It started as something mushroom shaped and as it pushed out more as whole stem of meat was connected to it. Further below, two ball shaped flesh sacks descended further, catching plenty of pubic hair. Lucy felt something else more ball shaped and harder come out with it, each one caught by the sacks. The mushroom was still growing, getting thicker and harder. Emily had wondered if thirteen inches was even big, but if this massive behemoth was any indication, it was too big!
"Ahhh! Emily! Get away!" Emily wondered why Lucy was telling her this. She watched as her "sister's" penis start to shake. "Agh! Something's coming! Emily!" "Ahh!" Emily tried to move and fell flat on her butt. As she did, she too felt something started to come out from within her. "Ahhh! It hurts!" Emily pressed onto her groin and tried to halt the advance of her penis, but it continued to push out. Like Lucy, it came out mushroom shaped with two balls underneath her. It then got longer and harder. It wasn't as long as Lucy's, but if anything was even thicker. "Lucy?! Lucy, ahhhhh!!" Emily looked towards her sister for help. Her body was jerked back and she was panting. Her whole body was covered in a white liquid and her penis was smaller, albeit still pretty big. "Lucy! Ahhh!!" Emily could feel something surge from within her penis. "Ahhh! Ahhhh! Lucy! Lucyyyyyyyyy!!!" Emily let out a beastly, manly roar as a white, hot liquid shot out from her penis and covered her own body! "Guh! Guh! Grosssssss!! Emily said as she soon stopped "peeing."
"Pant! Pant! Holy crap!" Lucy said, not realizing her vocabulary was getting older as well. She got up from the floor. She felt all disoriented. Her muscles were growing and growing. "Hnnngghhh!" Lucy let out intermittent grunts as they did so. She watched, her young sister... No, her young brother Eric, panting from her own ejaculation. His muscles were growing too, albeit not as much as himself. Eric's penis was still hard even now. Lucian felt his own cock stir again. "Oh god!" Lucian felt the need to relieve himself again and started stroking his dick. He didn't know why, but something within him told him that he would shoot out that white liquid again of he did. "Ah,ah,ah,ah!" Lucian grunted as he jerked off again. "Ah,ah,ah,ah,ah! Lucy! Lucy!" Lucian heard Eric call out his old name as he was also pumping his thick ass cock. "Ah,ah,ah,ah,ah,ah! Eric!" "Ah,ah,ah,ah,ah,ah! Lucy! Lucian!" The two brother called out to each other as they reached another climax. They cummed once more, hitting each other with their man spunk, but they were too entranced with their new appendages to care.
After several more seconds, they stopped cumming again as each of their penises got soft. The room then magically cleaned itself and their bodies. Clothes appeared on their bodies. It was a simple pair of wife beaters, boxers and shorts. "Hahhhh! Holy crap, that was amazeballs!" Eric said as he panted. "It sure was, dude!" Lucian said as he extended a hand to his "little brother." "Thanks, bro!" Eric said as he grabbed his big brother's hand and was pulled up. They looked at each other awkwardly and then half hugged each other. "We're bros now!" Eric said. "Bros before hoes, right?!" "Ain't that the truth!" They let go of each other and stared awkwardly at there groins. Each of them were spotting another raging hard-on in their shorts. "Wanna rub one out in the bathroom?" Lucian asked. "Sounds good to me! No homo!" "Right! We have a girlfriend after all!"