"Ahhhh!" Cried a voice and Jeff looked around. Laying on the floor in agony out in the hallway was his 14 year old, slightly overweight sister, Kelly, she must have gotten hit by the chronivac when it broke.
"Oh my god, Kelly are you alright?" He asked her, running towards her and kneeling down beside her.
Kelly looked up a her brother in agony, her eyes widening at the mere sight of his new Herculean stature. "Jeff??? What..... What the hell is happen to me?" She threw her head back in pain as a strange gurgling sound omitted from her stomach and Jeff watch in a mixture of amazement and horror as the fat on her body began to fade away, and with it the pain.
"Are you okay?" Jeff asked her and helped her up to her feet, he tracksuit bottoms slipping down to the floor as her waist was now too small to hold them up. "Yeah am...." She began but was cut off by a new wave of pain and she fell back against the wall. "Jeff please help!" She pleaded as sound of her bones cracking filled the air.
Jeff didn't know what to do, looked down at the chronivac in his hand, it was becoming clear that he had done more than just break the plastic shell and it was effecting the software.
Looking back at her, he was shocked to see his little sister was getting bigger as she rapidly began to age, but it wasn't just her height that was getting bigger, her muscles were growing too, far bigger than his. Her biceps rapidly went from the size of baseballs to the size of footballs and her exposed thighs were becoming enormous. Suddenly there came a snap as her waist expanded so much that the elastic on her once small panties snapped and fell to the ground, revealing her womanhood that was increasingly growing dark hairs.
That was when he realised that she was quickly growing through her twenties as her breasts began to swell to the size of basketballs, raising her now tight T-shirt up until it resembles a sports bra and showed off her hard set of eightpack abs.
It was while her breasts were growing that Jeff noticed that Kelly's painful moans had turned to pleasure as she came all down her muscular thighs, fully soaking them and resulting in even more louder moans. "OH GOD!!!" she cried as the orgasim ran throughout her body.
Eventually it stopped and Jeff's little sister was gone, towering before him now was a six foot seven, thirty year old Amazon, with steel biceps and rock hard abs.
Guess he wasn't the older sibling anymore.