Jeff finished his shower and wanted to experiment a bit on his sister Jamie. He found her sitting on the couch, watching TV, still a foot smaller than normal. He changed her stats a bit, clicked Enter, and watched the fun. Jamie sat there, as two DD-cup breasts materialized, stretching her small dress. She looked as if nothing was different. He changed the settings again, then clicked Enter. Her legs and arms grew longer, and she grew to a height of about 5'5". Everywhere below her neck appeared to be the body of a 20 year old, but her head remained the size and look of her 10 year old self. Her childish face clashed with her buxom body, but Jeff left her like that, considering it a funny look for her. Jamie's dress grew larger, extending to her knees and showing a bit of her cleavage. Mentally, she was still Jeff's 10 year old sister (which everyone would consider her to be), but physically, she was a tall, sexy adult woman (below her neck).
Jeff entered the room, and Jamie moved over to let Jeff sit down. "Hi, Jeffy!", she said with a smile. She wrapped her arms around him, pushing her large breasts into him. She stopped hugging him, and turned back to watching TV. She had the mind and face of a 5th grader, but her body was incredible! Jeff had to resist getting aroused by his younger sister.