Note: This story experimentally combines several fetishes: peeing, pooping, adult breastfeeding, masturbation, dry humping, and lesbian anal play. If you are someone for whom some of these are turn-ons while others are turn-offs, there are other stories on my profile that deal more exclusively with each fetish (except for lesbian anal play, for which this is a first).
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I'm Nora, a 20-year-old member of the very first generation of native Martians, but there is already a significant cultural divide between Earth and its first interplanetary colony. Most of it was a consequence of the circumstances under which the first colonists came to Mars. Despite great technological advances, every cubic meter of room and every pound of cargo in a spacecraft still came with a hefty price tag, which meant that getting the most out of the smallest feasible volume and the lightest feasible resource provisions was a major concern in designing the ship.
One key solution was to let carpets double as toilets. This was accomplished by embedding all carpeting with sanitary nanobots, which had been invented a decade or two before the expedition began. They were microscopic robots that could efficiently dissolve human waste into component elements which, depending on their usefulness, would either be processed and recycled into more resources or carried away and released into the vacuum of space. The tiny flushers did their work in seconds, leaving no trace of their quarry on the floor or in the air.
Although individual cabins, which were essentially just bedrooms, provided privacy to those who wanted it, it became increasingly common over the course of the long journey to forego shyness and squeamishness. After all, the colonists were consciously chosen among the most hardy and pragmatic people, largely uninclined to hesitate in abridging any non-essential social norms. Fortunately, circumstances were never so dire as to render the suspension of privacy necessary. Yet the settlers' deliberately selected dispositions, the inevitable close bonding fostered by braving a perilous frontier, and perhaps the utter convenience afforded by the sanitary nanobots all seemed to have combined to create an atmosphere of unusual openness. By the time the settlers arrived on the red planet, few if any of them would hesitate to relieve themselves within incidental eyeshot of their companions, who would mostly shrug it off if they even reacted at all.
In a similar vein, sexual activity also came to require much less privacy than most Earthlings would consider normal. One important factor here was that science had recently dealt aging a serious blow. The ship was populated by people who would be pushing 70 before they started looking or feeling noticeably different than they did in their mid-20s. This would be especially important for people who would have to live through a decades-long journey and still undertake the settlement process. On top of that, physical fitness had been another important criterion guiding the selection of colonists, and regular exercise was also encouraged even after they arrived on Mars in order to prevent the lesser gravity from causing atrophy.
Finally, women on the ship were encouraged to induce lactation in themselves. This would not only provide a convenient back-up immunity boost, but it could also serve as an extra source of food that would at least provide an initial buffer in the event of any unforeseen shortages. Again, the voyage was never threatened by anything that serious, but whenever too much milk went unused, as it often did, it could sometimes accumulate and become uncomfortable. So the lactating women developed the habit of letting their friends or lovers drink their milk, increasingly straight from the source. To prevent any unwelcome sexual overtones, it was mostly the non-lactating straight women or gay men who helped them relieve the pressure, except when the relationship between the feeder and suckler was sexual anyway.
Crucially, even after the colony was well-established and growing, these habits never entirely went away. For obvious reasons, careful restrictions on public activity were instituted as soon as children started being born, and as the Martian population grew beyond the original close-knit group of 100 pioneers, the informal consensus on what was acceptable soon drifted partially back towards more Earth-like norms. However, I must emphasize the word "partially" there, because a visitor from the homeworld would still notice a definite difference in our expectations of privacy and modesty. The first settlers simply saw no real reason to abandon their innovative customs altogether and some good reasons for keeping them. For instance, eschewing toilets in favor of nanobot-laden floors meant less overall usage of water, which was still a resource we didn't want to waste.
One relatively recent cultural change that we shared with Earth was the extension of secondary education for three extra years, which was why my 18-year-old sister Cindy and I were both still attending the same school together, though we were obviously in different grades. The policy was barely two generations old, having been implemented shortly before the Martian settlement began, so I hadn't given it much thought until now. I wasn't quite ready to leave my home planet, but I only had one more year before college, and there were no post-secondary institutions on Mars yet.
I was already experiencing a touch of the college lifestyle, though, in that Cindy and I lived in the girls' dormitories. Why? Well, a significant number of Martian parents still frequently traveled back to Earth for various research purposes, which meant that they were often away for months at a time. To help cope with this, the first school on Mars was established with boarding options. That was an elementary school, so the students were all too young to go home to empty houses. The secondary school was built while that first cohort of pupils made their way through the preceding grades. When it was finished and ready to open, the boarding options were extended at the behest of some traveling parents who deemed the age of entry to still be a tad too young for staying home alone. By then, on-campus living had become routine for most kids anyway, so many kept living in the dorms even after they outgrew its necessity. My sister and I were two such students who'd lived on-campus since kindergarten.
