Even the leaders of PIS were at least mildly surprised at how quickly the newcomers acclimated themselves to the sorority's unorthodox bathrooming and sexual protocols. Within about a month, virtually every member was perfectly comfortable relieving herself on floors or furniture in full incidental eyeshot of others. In another two weeks, a comparable majority was just as uninhibited with respect to sexual self-gratification, and in about another two weeks, very few if any felt at all awkward about offering or accepting friendly assistance in scratching the erotic itch. Often, that assistance was entirely passive, with one girl just resting while she let her body serve the role of a pillow for her horny friend. More active assistance usually took the form of one girl fingering the other to orgasm, providing that extra bit of ecstasy that only seems possible when the brain that's experiencing the climax is separate from the one that's causing it. In fact, I'm not sure if the current membership just happened to already be a particularly randy lot, or we were all just able to indulge our urges more often because privacy was much less of an issue. Either way, two months into the semester, it had become a comparatively rare moment in the PIS house when there wasn't someone somewhere who was masturbating, helping a friend masturbate, or relieving themselves on the nearest nanobot-laden surface.
Late one night, Susan and I were sitting on the couch putting the finishing touches on an essay for a class that we both had, while Laura was lying on her stomach on the floor in front of us, browsing the Internet on her tablet. Soon after finishing, Susan's hand drifted to her crotch, and she rubbed it a few times before she stood up only to immediately straddle Laura on the floor. "Time for a good butt-humping!" she said, already rolling her hips gently against her friend's rump. "I really wanna cum right now."
"Knock yourself out," Laura replied with a small smirk.
Susan was wearing yoga pants, which were apparently thin enough for her that she didn't feel the need to take them off. Instead, she just kept grinding her pussy against Laura's ass, purring softly as she felt the first hint of satisfaction. She continued rocking her pelvis against her friend's firm glutes, slowly at first but at a rapidly escalating rate. After about five minutes, her breath had grown rather ragged, and her gyrations were causing both her and Laura's hips to shake visibly. She let out a short yelp followed by a moan that as to be the first of many as the movements reached a fever pitch. She bit her tongue and gripped the sides of Laura's abdomen. Throughout all of this, Laura barely took her eyes off her tablet, so she was apparently quite used to this. What surprised me was what happened as it became clear that Susan was nearing climax. "Shoot, I gotta take a dump!" she realized suddenly. "I think I can hold it though. I'm too close to cumming now!" she emitted a long moan and accelerated the grinding of her crotch on Laura's butt even further. "Damn it! I really gotta go!" she groaned. "And I'm about to...CCCCUUUUUMMMM!" Her feverish grinding halted as she climaxed, and after a couple of involuntary pelvic spasms, she was back on her feet just long enough to yank her pants and panties down. She then hovered over the couch and let a huge brown pile come rushing out of her onto the cushion next to me, letting out a long sigh of relief.
Just a few minutes later, Laura rolled onto her back, hoisted her hips up just long enough to pull her own jeans and underwear down to her knees, and held her legs up in the air while she sprayed the carpet with no small amount of pee. She then redressed herself and rolled back onto her stomach.
About an hour after that, I finally decided to turn in for the night so I headed upstairs to the bedroom I shared with Beth. On the way there, I ran into Tricia, a curly-haired brunette who'd been one of the topless girls in the kitchen on my first morning in PIS. She was squatting and peeing on the hallway carpet. "Hey, Trish," I greeted with a yawn.
"Hey," she replied as her pale yellow arch swelled briefly before quickly dwindling. "You hittin' the sack?"
"Yep," I confirmed, removing my tank top as I reached my bedroom door. I sent her a small smile before entering the room and closing the door behind me, throwing my top into Beth and my shared hamper. My skinny jeans and panties soon joined it, and I moaned at the feel of my cool linens against my bare skin as I crawled into bed. Beth was already konked out above me, and she was beginning to snore a bit. Fortunately, I had long gotten used to that, so I had no trouble falling asleep myself as soon as I hit the pillow.
Nor was I surprised when I woke up gently the following morning to the sounds of Beth's mattress shaking. It hadn't taken long for masturbation to become part of her wake-up routine. I heard her panting and squeaking and estimated that it would be about two minutes until she came, so I just lay there and dozed, letting her purrs of pleasure lead me slowly into full wakefulness. "Oh, God!" she intoned raggedly as her gyrations reached their zenith and then abruptly tapered off with a final cry of bliss. I could almost hear the squish of what was undoubtedly an impressive turd rush out of her ass and onto the bed between her legs, perhaps emboldened by her post-cum haze.