An un-named Twin, and an unknown trans-temperate-rain-forest.

You live in this immense forested area of the world, somewhat jungle-like but not quite tropical enough for that. Imagine, if you will, a rainforest made up entirely by obnoxiously large Willows, Oaks, Maples, Paper Birchs, Cyprus, assorted fruit/nut trees, and cold-hardy Mangroves. It snows here in winter and rains in spring, summer, and fall with some sort of precipitation happening nearly every day.

As for "Who" you are, you have no name, and see no need for one as-of-yet because you have only ever met ONE other of your kind that is sapient like you, who is also your identical-twin sister: so, when you each call-out "SISTER!" in your twin-speak language you of-course each know who you are talking about, as you do when you say "ME!" in any context to the other one.

Today is a day much-like any other, it's raining, but, you don't care very much, both of you are staying home. You have plenty of food in the giant-mouse-sized house you've built together inside a hollow tree, and see absolutely no reason to venture outside in this late-spring downpour going on.

"Hey, sister; the rain just went from spathering to shegoling do you think it's going to let-up? I want to check on our fishtrap." your sister says from the window.

Okay, scratch that, your sister wants to be a blithering idiot and go outside in this...

*Sigh.* "Fine, sister, if it gets down to sivaring we'll go check the trap." You allow.

"MMMM, fair." She says, and heads over to check the boiling pot of stew on the fireplace.

Now, I must make something clear about all this: you call each-other "sister" even-though you are both futahs because you have never met anyone else like you nor seen any females naked that are other sapient beings. You've observed the comings-and-goings of many adventurers but none of them have taken off their garments so you've some-what assumed that all "females" are futanari, and the males are... A non-generative warrior caste...? You're not exactly clear about that, but, its also not important at the moment; although it will become so very soon.