Jeff had a small idea pop up in his head. he had enough time for a test change and decided that instead of changing his age which could end disastrously if there was an error he would just change something else about him in order to test whether the chronoviac was actually working. He took a little look at some of the stats and saw a bunch of different things. hair and eyes colors, ethnicity, etc. Then he saw gender where at first he thought "no, I am not going to be a girl." then upon another thought he thought "Well if the chronoviac malfunctions i'm just going to say as a guy. If it works and Emily finds me here maybe she'll be kinder to a little sister then an annoying little brother. I can handle being a girl temporarily for now at least..." He clicked on the gender transformation and put in the specifics which pretty much left him as a little girl. He clicked the transformation button and then his body started shifting around a bit. His hair grew longer as it ended up straight down your back. Your facial features became more feminine as your dick shrank in as your little vagina developed.
Looking at yourself you said to yourself as a whisper "...that's not as bad as I imagined... Well that worked so time to grow up." Then...