Write a chapter of 1000 words set on the fallout universe, takes place on vault 91, ones of 120 vaults part of vault program by Vault-Tec corporation,the Vaults were advertised as the best method to safeguard the American people from a coming nuclear apocalypse but in reality the vaults were actually designed to be a vast network of long-term experiments to study human behavior and physiology under a multitude of situations an vault 91 is no different..

Upon entering Vault 91, all of the Vault Dwellers would be put on a mandatory daily drug regiment, to be administered by a small group of Mister Orderlies that also act as helpers to any human medical staff present. The residents will be told that the drugs they are taking are to help protect them against potential radiation poisoning, but the true purpose of the drugs is far more sinister. In fact, not all residents will be getting the same chemical cocktail to begin with.

The women of Vault 91 will be given an experimental growth treatment which will make them grow taller and stronger, maxing out at a bit over seven feet tall on average. Of course, this won’t make them lose any of their femininity: in fact, in some test subjects those same growth hormones may even increase the size of their hips, butt, and bust on top of everything else. However, these drugs also have the side effect of damaging certain areas of the brain dealing with critical thinking and memory retention, effectively making the female population of the Vault become dumber as they continue to grow.

The men of Vault 91 will be given a series of drugs that will do pretty much the exact opposite. Their memory retention and critical thinking skills will increase during their treatment, increasing intelligence for them across the board, but these same drugs will also stunt their growth and make it harder to build and maintain muscle mass, eventually making the male population smarter but physically smaller and weaker than their female counterparts, with a final projected height of around four feet.

The purpose of this experiment, at least in the eyes of Vault-Tec, would be twofold. The first would be to test the effectiveness of these drugs in general, and see if the potential benefits of each may outweigh their downsides. The second would be a sociological experiment to see which of the two genders would take control of the Vault once the drug treatments reach their final outcome. Will the stronger but dumber women use their physical strength to intimidate and strong-arm the men into serving their desires? Or will the weaker but smarter men convince the women of the Vault to let them do all of the thinking, and that it is in their best interest to follow any orders given to them by a man. Perhaps the two groups may even manage to find a balance that lets them maintain a surprisingly high level of gender equality despite the new size and intelligence gap between the two of them. In essence, Vault-Tec wants to figure out whether brains or brawn would win out if they were both pushed to an unnatural extreme.

Unfortunately for Vault-Tec, things didn't work as they expected,first of all the drugs didn't seen to work at all on the residents of vault 91 outside a slightly increase headache on the women and muscle cramps on men, a fact that made vault-tec to almost scrap alway the vault until it was revealed that the drugs take effect on the next generation that are born and grow up in the Vault with the regiment would be changed, the effect are minimal and barely notice but they accumulate by each generation.another side effect is that the drugs increase female births and diminish male births, minimal at first but like the previius effect it accumulate that by the 200 years late there be 100 women for every man.

The regiment for the women has the side-effects of increase their estrogen to unprecedent  levels this will make so their hips, butt, and bust size well beyond the expected in short drugs not only not cause women lose any of their femininity but in fact surpasse, also will cause women to become a state of mind to hyper-energy, high gleefulness, and high affectioness especially at a males

Follow the daily life of one of few men on the vault, 200 years later, with men being pampered by the women