Chelsea suddenly felt warm as Jeff initiated the transformation. At first, she was terrified as to what he could be transforming her into, but soon she felt her body changing, but in a pleasurable way as she began to age rapidly. The blossoming 14 year old girl was maturing at an accelerated rate. Her perky B-cup breasts swelled into full and ripe 36 C-Cup breasts straining the thin fabric of the tank top she had been wearing as the now erect nipples poked through prominently. Her hips expanded more as her ass took on a pleasing heart shape and "bubble butt." She was racing through her teenage years with a vengeance and soon she entered her twenties as her face lost the innocent look of a young teenager as baby fat melted away and her features sharpened into that of a young adult woman. Her legs had lengthened and grew more shapely and sexy as her whole body now had a very attractive hour-glass shape. Even Jeff was stunned to see just how beautiful his little, or rather older sister now looked. She was pretty and sexy enough to be a playboy centerfold! But Jeff was not quite done yet as Chelsea raced through her twenties and into her thirties as her features sharpened just a bit more as her breasts swelled a bit more into perfect D-Cups and they were now just sagging slightly due to their increased weight and size in her straining tank tap. The tank top now rode up on her mature body exposing her midriff and her tight and tones abs. Small laugh lines could not been seen around her mouth and just the beginnings of crows feet around her eyes as she stopped aging at 35 years of age. She was now a fully mature and very adult woman.
As she admired her new found maturity and incredibly sexy body, she suddenly felt her head get warm as the sexual knowledge of an experienced older woman flooded into her mind. Chelsea had physically been a virgin up to this point with no real experience. Certainly she had made out with a boy a few times, but noting more than that. Now she had memories and knowledge of a mature experienced woman, and that turned her on.
As the changes were complete, she turned to look at her little brother. As opposed to being repulsed by him, she suddenly found him attractive, though a bit young now. She found his power intoxicating now and the idea of incest with her little brother now did not seem such an obstacle.
"Well little boy. You ready to finally take my virginity properly this time? I know I am." she whispered to him as he had released her body and she stood up and walked seductively over to Jeff, who was mesmerized by this mature, older and very sexy woman that was his sister. She pressed her large breasts against his body as she pulled Jeff in and kissed him long and hard. Chelsea then led him by the hand to the bed where she let her pants fall to eh floor revealing her long and sexy legs as well as her straining teenage panties that hugged her larger hips and ass. She then pulled off her tank top and let her impressive large tits freely bounce and jiggle into perfect teardrops with large aerosols and erect nipples.
Jeff could hardly contain himself as she leaned in and kissed him again as they began to frantically have sex. This was more than Jeff had thought was possible as he explored every part of his sisters new body when he.....