Alli Finalli!

Allison struggles in the dark, she is able to yell, but it hasn't brought help yet. She redoubles her efforts at the bonds holding her. She has managed to work one leg free by wiggling it and finally creating enough space to kick. Bashing the material she chips away until one leg from foot to thigh is free, and then she starts bringing the heel of that foot back against the cement holding her other leg. Her arms are still covered, and she's still affixed to the wall, but one thing at a time. She hears the noise of a large stone being pushed and suddenly there is a dim light from a newly revealed aperture. The creature pushes the stone away to finish opening the entry, it must weigh a ton! Her buttocks and her firm legs strain a bit, and her breasts are pushed back into her body by her bent arms. She turns and stands in the dim light, facing Alli for a moment. "Something is strange." Alli thinks, looking at her, "Different." Then she realizes what it is. "Oh jeez, are you gonna **** me?" She asks aloud to her captor, who responds only with a tilt of her head and a small twitch of her new penis, standing at attention.
Looking around in the new light, Allison sees the material she is trapped in. Around her it is a white chalk, much like plaster, and it appears to be breaking down like that material does as it dries and weathers. It is seeping from several places in the wall, the material, when fresh, looks viscuous, sorta like paste. She had been held in it while ****, and as it hardened it blocked flow and stuck her to the wall, cementing her in. She begins to form a plan.
~A creature who mates only once every 50 or so years has strong instincts when her time comes. She has found males to fertilize the eggs, now the urge still drives her. She must make the absolute most of the opportunity, nature is insistant. Her pheromones pulse, her shoulders rotate back. She approaches the confined female before her and rotates her shoulders back again, pushing her chest out.The pheromones are filling the room now, and she sees the effect on the other. Allison's eyes flutter, and Alli is alarmed to feel a wetness developing.
"Look, we can talk about this or something." She tries "Can you talk?"
Gilly steps forward and grabs the haunch of Alli's exposed leg. She aligns herself and steps in close, her new dick throbbing, the tip probing Allison's cleft. Allison squeaks in alarm and steels herself to what she must do.
Gilly thrusts, the instinct that drives her is intoxicating, the feeling is invigorating, Allison squeaks again and puts her head down on Gilly's shoulder. Gilly pounds her harder and deeply, her buns tightening with every thrust as she grinds all the way to the hilt. The combination of Allison's response to the pheromones and Gilly's natural skin moistness has facilitated an easy lubrication, and it seems that Allison is happy for ONE thing to go her way this weekend! Allison raises her leg, pointing the toe, and Gilly grabs her thigh near to her buttock. Allison wraps her leg around Gilly's back and pulls her in. Surprised, Gilly skips a stroke.
"Go on, Fuck me HARDER, you bitch!" Allison first whispers, then shouts into Gilly's ear.
"Come on, you can give it to me right, come on, shove it in" She continues, thinking "all part of the plan."
Gilly shudders from the whispers in her ear, Allison's mouth cradled in the nape of her neck and breath on her shoulder and ear. She thrusts again, control practically lost in the mix of instinct and raw pleasure. The female under her whispering until she thrusts and then grunting from the **** of it is driving her wild!
The substance holding Alli in place is dry enough to be breaking down, the creature pounding her is dislodging her from her entrapment. This was Alli's plan, but now all she can do is hold on for the ride! It's so fucking GOOD all she can do is moan and hold on! Her right arm comes free, and she wraps it around the creature's back. Despite her breasts pushing up against the Gill woman's, she could almost forget entirely the other is female. Her shoulders are narrow, but the muscles are tight! Alli's left side breaks free all at once, and they are pitched to the floor. The Gillywoman hardly skips a beat, pounding into Alli so hard that Alli is inching across the floor with every thrust.
Alli gets a grip on her senses momentarily, her ass is sliding across the wet floor of the chamber and she is moving toward the paste liquid (some kind of naturally occuring cement, she supposes) the plan returns to her mind. Squeezing with her snatch as much as the muscles will allow, she grabs the creature's ass with both hands. The creature responds with a redoubled effort of hard pounding. Thwack! Thwack! Thwack! the wet flesh claps together. The creature's muscles are tightening! She is about to release! The creature is letting Alli pull her inside, no longer holding Alli by the hips. Alli makes her move.
Qiuckly, she pulls away from the Gillygirl, leaving her throbbing and ready to finish. She crawls quickly over to the puddle of the paste on the floor and puts her head to the floor, lifting her ass high. Her feet are in the paste and her ass is over the edge of the puddle. Gilly streaks over, taking the bait, it two seconds flat she is deep inside Alli's hot snatch and her knees are three inches deep in the paste! Allison's brain is again turned to mush as the sound of flesh smacking flesh speeds up again, and her abused quim is first assailed with fast and hard pounding, a punishment for running away, and then, as Gilly's muscles all tighten and the cock spasms inside Alli, the creature pressing hard against Alli's fleshy ass from hehind as her snatch is filled with something ample and hot. She collapses, and then Gilly does the same over her.

~Marcus and Will fumble in the dark searching for their lost friend. The Heady pheromones still affecting them greatly. "We're looking for Alli, when we find her we are getting her and heading straight out!" He says emphatically. "No more of this 'animal instinct', we're people in control of ourselves, Dammit!"
"Right" Marcus chimes in "Nomatter what we find, we're getting Alli out of this crazy place! Shhhh! Did you hear that?" The two of them stop and quiet down, as they listen, they hear a slapping sound somewhere, and small squeaks. "Alli!" They both say in unison. They follow the sound as quickly as possible in the dim light.
"Right" Will says "We get her out, ignore these boners, and put all of this behind us!"
As they turn into the adjoining chamber, their jaws drop.
~Allison and the creature are on the floor of the chamber, The creature's legs from the knees down are sunk into some kind of muck, her hands have sunk into it on either side of Alli's body, which she straddles as if she'd been just fucking Alli doggystyle, which is crazy since there is no dick between the creature's legs. Their asses are both sticking up and they appear exhausted, naked and sweaty. Cum dribbles out from between Allison's legs, Allison slumps forward onto the floor in a heap of firm and jiggly female flesh.

Marcus looks at Will, Will refuses to meet his eyes. Marcus shifts in place, fidgiting a little.
"Um, I know what we were sayin' and all, but-" Will cuts him off by running over to Allison. He lifts her face up and whispers to her: "Alli? You okay?"
Groggily Allison comes too.
"Uhm, uh, yeah. I'm alright, how stuck am I?" Will looks down to see what she means, her feet are the only thing embedded in the paste-like substance that the creature is mired in.
"Not bad, maybe we can get you out. We need to keep this Gill-Woman asleep."
"Does she still have a dick?" Allison asks nervously.
"No, you mean she had one? Like a strap-on or something?" Will says.
"No, she GREW one. Then she fucked me with it. I tricked her over here to get stuck, we gotta get outa here!"
Allison looks around, and Will takes hold of her hands and starts to pull her out from under. They look over at Marcus, and they both stifle a cry.
~Marcus, across the room, still feels the pheromones. He was willing to hold back and get Alli, but it was just unfair what fate chose to hit him with next. As Will runs over to assess Alli's condition, Marcus is given a full-on view of two supple asses sticking up and ready. There's just no way to overcome it, Will might be able to, but, well, good for him. Marcus moves across the room, careful not to get caught in the sticky puddle, maneuvers down onto his haunches to the side of the puddle and takes his throbbing cock in his hand. He is ready to guide it in when his friends see him. They hold back from shouting, and he readies his hips to thrust. Will pulls Allison free of the paste on her feet, and Marcus grabs a good hold on the creature's hips. She starts to wake, and turns her head to see her predicament. Marcus hooks his thumbs onto her ass cheeks and pulls, spreading them apart and revealing the bud of her asshole. Scooting forward, he probes it with the tip. She shivers and pulls, trying to free her hands and legs, no good, no leverage. Marcus pushes forward burying the head past her threshold, her slimy, sleek skin accomodating his action.
"OH, GOD!" He groans out, as his dick is enveloped by her super tight asshole. He begins to pound, she wriggles beneath him, unable to move far in any direction. He redoubles his efforts and she begins to give up and take it.
"SHHHHHHH!" is all she can muster, somehow, that reminder of their first encounter vitalizes Marcus. Reaching under her and grabbing her breasts he pulls her back and sinks himself into her hot butt up to the hilt.
"SHHHHHHH! she manages again, and he speeds up, slamming his hips into her ass and grunting while doing his best to hold out. It's no good, her tight ass and slick tits are more than Marcus can handle. Remembering her eggs and all that, he pulls out and shoves it into her vagina, emptying a huge load while she squirms underneath. He pulls out, panting. She looks back at him and raises her lower half up offering her snatch. Will is stunned, he knows they need to go, but the pheromones are strong here, and the confined Gillygirl is hot! He remembers the sensation of her mouth around his erect penis and balls all at once.
"Marcus, come around here" he tells his friend. Trading places with Marcus, he instructs Marcus to offer up his cock to her face. As Marcus does, Gilly gets the drift. Opening wide, she takes his cock and balls into her mouth and throat, immediately Marcus is erect, grabbing the back of her head roughly. Will sets up carefully behind her and thrusts his huge cock into her snatch, Marcus' cum oozes out around his member and Gilly grunts from the stretching Will causes. From somewhere in the room Allison protests, they barely hear her. She too feels the draw from Gilly's pheromones, but is doing better to resist.
Marcus throws his head back as Gilly's suction gives a sensation he's never experienced before, his balls are engulfed in her slippery mouth, her tongue squirming past and around them, running up and down the shaft. He reaches down to grab one breast while writhing in total extasy. Will starts grunting like a beast and his hips start smacking into Gilly's asscheeks, a wet slapping sound fills the cave and echoes off the walls: Slap, slap, slap, slap. Will's grunting gets more ragged, and his thrusts pick up in speed. Hearing this, Marcus can barely hold back. He looks down at her body, shiny and wet, prone before him, her boob in his hand, nipple stiff as a cactus needle. He pulls her head with his other hand, forcing his cock as deep down her throat as it will go and empies sperm straight down to her waiting belly with a roar! Will has turned his attention to Alli. They meet eyes, and he seeks approval from her silently. She gives a small nod, and mouthes the words: fuck that bitch.
Will speeds up, the slapping sound is filling all of their ears, his grunts get loud and he looks down at Gilly's firm wet ass as it smacks against his hips. Without skipping a beat, Will pulls out and thrusts into her ass until his nuts are crammed against the straining bud of her asshole. Marcus pulls out of her mouth and Gilly screams! An inhuman sound eminates from her before her head drops and she begins whining and moaning. Will's cock stretching her. His driving **** is coming to an end, his ragged grunts indicating he's about done. He thrusts one last time and spasms hot jizz into her ass, then, pulling out, he sprays more onto her slick muscular back.
Slumping to the floor, the guys are done. Allison rouses them to their feet and they take off, leaving Gilly trapped and covered in cum. "The cement gets weaker as it dries" Allison informs them "We gotta get out before she's free!"

~The three of them run toward where there was light in the egg chamber, and begin climbing and searching for the source. There are some perforations in the roof of the cave there, and one or two seem large enough to escape through. Climbing to one they're free! They search the shoreline for familiar terrain and find their way back to their camp. Hustling, they throw as much gear into the truck as they can manage quickly. They pile into the cab of the truck as something emerges from the water and blasts onto the bank. The truck is alive with a turn of Will's key, and they bump off of the gravel and onto the worn dirt road. Gilly streaks across the beach and grabs a hold of the tailgate. Will swerves the wheel, and she's thrown, dissapearing into the woods. They floor the accelerator and get road behind them. As they see the street ahead, Gilly appears in the middle of the road, standing fearlessly. Will streaks up, and swerves around her, barely missing her, and her form recedes away in the rear view mirror.
"We're never going to talk about this trip to ANYBODY!" Allison shouts. "I'm going to forget about it right now."