Looking at your sister watching the T.V. you brought up her stats and saw a few things like the fact that her breast and dick size were represented with an N/A. You found that you could manipulate these values and then decided for the fun of it to give your sister some big breasts for some laughs. So you went in a changed her breast size value to E-cups and as soon as you hit accept into the change box and you saw your 5 year old sister grow large tits and her clothes changed to match her body. Instead of them looking cumbersome to her she seemed to be used to them... Although you would assume that her back was killing her. You remember what had with the game in the past and wondered if your sister had actually changed so you walked out to where your sister was watching T.V.
You saw the now more top heavy girl who saw you and said "Hey sis! what's going on?"
you said "Just seeing if anyone was watching T.V. I'll let you be for now."
Megan said "Alright, see you latter Sis."
You walked away as if nothing was off and then you quickly looked down and saw some massive breasts instead of your normal torso. You went to the bathroom quickly and looked in the mirror above the sink. You saw your female face and saw that your hair had grown a little curvy and long towards your shoulders. You also got a better look at your breasts which were even larger than your sister's breasts. You lifted your shirt off and looked at your bra and saw a tag that read HH and felt amazed that your back wasn't aching. You also felt around your neither regions to confirm that yes you had nothing down there and your butt/hips are fairly large. You put on your shirt and went back to your computer and saw that you, your sister, and your mother were changed. Your mother also being more sexually mature than before. You found a button that read "information dump" whose description read "let you know what your transformations have done."
Clicking the button your memory changed a bit, you still remembered your previous life but now you had been a girl for life. You had breasts for a long time, really ever since you were 3 or 4. You were a bit teased for having those boobs, but once the guys had gotten to a certain age you started to get a lot more popular. Your mother had told you that her whole family tree had only girl's born for generations who had developed breasts early in age. After some recent tests it seems that this was caused by excessive estrogen present during fetal development in the womb. Whether or not genetically you were female your body would end up turning into a girl through this excess of estrogen and deficiency in testosterone. Heck knowing this your mother had you take a genetic test and found out your bodies chromosomes were and XY or you are technically a guy despite being a girl in every other way. Your sister had XX and was a girl fully like your mother, but you were a bit worried about a few things such as whether or not you were actually fertile. You didn't actually have a boyfriend, but if you did and you had kept him for awhile you would tell him about the odd DNA thing along with the fact that if you could have a child it would most likely be a girl.
Staring at the game you realize what had just happened and thought about what to do. You decided to...