The Change.

The history books call it "the Change". It all started around 80 years ago. Without warning, young women began to change. Not only did they suddenly develop another sex organ above their first, but they were prone to bouts of arousal so strong they lost control of themselves. These "futanari", a Japanese term adopted by most of the world, could become incredibly strong and durable during one of their frenzies. And worse, for some people, they were just as capable of impregnating women and futas as men were, though their children are always female at birth with the same odds of turning futa later in life as any other female.

The world wasn't sure what to do with itself. Atrocities soon began as the nations of the world tried to protect themselves from their own population. Of course, exiling or killing off your own younger generation of women is a fast way to destroy your own country as well. Experiments were performed, new societies created, and wars broke out amongst an already fragile political landscape. When the truth was revealed, everything went up in smoke. A rogue scientist working as part of an international team leaked their team's findings. Unlike what most people were led to believe, the futas were not the result of a virus or parasite, not an alien invasion or demonic possession. It was evolution. Simple biology. That was when the futas of the world and their allies truly began to fight for their right to exist. The world fell to pieces, the human population dwindled, and now you live in a world trying to rebuild itself while still dealing with old issues.

No one can say for sure whether this mutation is a step forward towards a better humanity or simply a random change like eye color or hair length. There are many opinions, from futas being cancerous to society to believing that Gaia, the spirit of the earth, is pushing humanity towards a new, brighter future.

You live in Franco-Europa, a nation born from the ashes of multiple countries that collapsed in western Europe. The population is 70% female/futa and most people have a neutral to positive outlook towards them. Still, it's a free monarchy and not everyone thinks a world full of futas is the way of the future. The queen and her council are understanding of the needs of futas, and the world. Futas are given leeway in regards to their rampages. As they grow older, futas may learn to sometimes control themselves, but only with great effort. As such, crimes committed during such times are largely forgiven. Additionally, since a large portion of the populace can't help themselves, there are no decency laws in FE. Nudity and full blown sex is perfectly acceptable in public, though not common. There are also specially designated "relievers", denoted by their pink armbands, who offer themselves up freely to futas in need. The low population, a worldwide problem, has also led to radical social changes. Being a mother is now considered an honor and the state pays handsomely for women to submit themselves to creating the next generation. Others are designated as caregivers, as many of the mothers are either too focused on producing as many children as possible, or lose their lives in the ongoing conflicts with neighboring nations.

That's how you wound up here. Your mother is a well known breeder with zero interest in actually raising children. She doesn't even send you cards on your birthday. But that's fine. You live in Ms. White's Foster Care Home with all your sisters. Well, house sisters, technically, with no blood relation you're aware of. But to you there's no difference. These girls and Ms. White are your family.

Which makes what just happened with Elizabeth all the more awkward. Though, she didn't seem to mind all that much given how she's now helping Ms. White tend to you. It makes sense, actually. Elizabeth is dating a futa, Merissa, and is probably used to these sorts of outbursts.

After running through information you already knew but couldn't properly process in the heat of the moment, Ms. White puts her hand on your knee and says, "We're sorry, dear. We knew what your stomach pains could mean but didn't want to frighten you so we didn't say anything. That's why I sent Elizabeth to check up on you."

Elizabeth smack's her own tight ass, causing it to jiggle, and says, "I've got plenty of practice handling a wild futa! Still, that was a wild ride, kiddo!"