12 years ago the bimbocalypse started, and the world was thrown into anarchy. A few pockets of people managed to survive however they were mostly men as during the chaos a lot of uninfected women were killed for having "snuck up" while being somewhat well endowed. One such small commune of mostly men had managed to find, reinforce, and make a prison pretty inhabitable. If a bimbo came by she would usually be killed from afar. However one time on a resource run and after a small slaughter a bunch of men heard a small baby crying. They looked and saw a small baby girl. Some of the men assumed that a bimbo may have gotten pregnant and had you. Some thought maybe a mother was running through and became a bimbo. Just glancing at the baby she didn't have any tits developed or anything, but she easily could've been a carrier.
One of the more scientifically inclined men said "We're in a prison. We just take care of her a little bit, keep her behind bars when she grows up a bit, and examine her. If she becomes a bimbo we just execute her and that's that. We could learn something from her. Besides didn't Ursa have a kid recently as well? If she's healthy she could make a nice friend or at least another kid to talk with."
So they brought you back to their prison home and locked you up in a cell with a lot of bedding to sleep in. They'd bring you formula, and you grew up relatively healthily and clothed. When you were 3 you were walking and talking, but was kept behind bars. They managed to teach you english along with mathematics and history. There was also a kid about your age called John who was fun to talk to. Although you were never allowed to be too close. The men just called you 1 as if you were just some sort of experiment, which you kind of were. You knew about the Bimbos outside and that they had ruined society, and you were apparently one of their offspring.
Now 12 and still behind bars you woke up and got your breakfast through the jail bars as Winston the man who took "care" of you most took another blood sample. Curious you asked Winston "Um... Sir... do you know if I have that Bimbo Virus thing?"
Winston raised an eyebrow and asked "Why do you wonder now?"
You said "Well... my nipples have been getting a little more sore and my chest is starting to feel a little swollen..." blushing a little bit you covered your chest.
Winston said "Well... I've found something, but it's not exactly like the Bimbo Virus from those outside. Then again you are of the age where most girls would start developing such features. Either way you're a smart girl. I wouldn't worry too much about becoming a monster. I'd just finish reading your books." You then nodded and then went further back into your cell. Eating breakfast you looked at your shirt and noticed your nipples were very visible. They seemed to be getting bigger. You somewhat wished you could just cut them off and not became a bimbo.