Then, a sudden notion of rationality popped into her head,
What am I doing? I don't even know what this thing is and here I am, lying in bed waiting to be fucked!
But it felt too good. Two of the tentacles squirm up her thighs until one paused just outside her wet pussy lips. Any idea of backing out vanished immediately. Sandra could no longer restrain herself and with one hand, she pushed the tentacle deep into her warm vaginal cavity. The girth of the 'phallus' seemed enormous to the tight entrance and Sandra felt her pussy lips stretched wide. The limb pushed forward steadily until it reached the deepest confines of her pussy.
"Ahhhhh..." She cried loudly as all the muscles in her body tensed, feeling the tendril being accommodated inside of her.
Then, the creature placed another tentacle at the entrance of her anus. She had never had anything enter her ass, much less something that big, and she instinctively offered resistance. The tentacle in her cunt started to pump in and out and the added pleasure was so overwhelming that it made her relax her sphincter, which caved to the increasing pressure of the other appendage. Sandra opened her eyes wide as the tentacle buried two inches inside her tight anal passage. The slime exuding all over the creature's skin and tentacles made it very easy to slide in.
Despite her fears, Sandra felt almost no pain from the anal penetration. The tentacle pulled back one inch and then pushed forward a little further than before, and so on. The moaning teen felt her rectum widen, as the strokes got deeper and deeper until it was at least ten inches inside of her body. Sandra clenched the bed covers and grunted at the sensation of the double penetration. She began jerking up and down, forcing the tentacles to move about and increase the friction in both holes.
Several smaller tentacles came out the creature and started to explore her body. One of them wrapped around one nipple and the jolt of her body indicated to alien that it was a soft spot to attend more carefully. Soon, her other nipple was attached to, as well. Another tendril passed along her lips, smearing them with slime which she licked off immediately.
Then, she felt a large drop of slime drip onto her lips and she opened her eyes to see another of the big tentacles waving above her face. The flavor was irresistible and she reached out grabbing the appendage and shoved it into her mouth, trying to suck out more fluid. The sweet juice poured from a small hole in the tendril's tip and as the substance gushed out she swallowed, over and over until her stomach was completely full.
Sandra frenetically humped on the tentacles that filled and stretched both her holes as deep as humanly possible. Meanwhile, the animal moved two other tentacles towards Sandra's pelvis. They were slightly smaller than the first two but as Sandra felt them rub against the outside of her cunt and anus she stopped her humping and pulled the tentacle out of her mouth.
"Oh no! This is too much!" She said out loud as if the creature could understand her.
She tried to move away but one second later, it was too late.
"No! Please! Ahhh!" Sandra screamed as the two new tentacles wormed their way inside of her pussy and asshole simultaneously.
Despite her protests, the creature simply kept pushing the tentacles further in, stretching the teen's body beyond anything she thought possible. The remaining tentacles continued probing her nipples and clitoris relentlessly. For the creature this was just an exploration stage and so far everything was working perfectly. This female and others like her would be very easy to manipulate using the right chemical components.
Sandra grunted with each thrust, obvious pain shown in her face, but slowly the grunts turned into moans of enjoyment. Her body quickly adjusted to the extreme fucking and pleasure was beginning to take over again. Sandra resumed her own humping, pushing herself against the tentacles, her mouth once again sucking the tentacle that was trapped in her hand. She could feel the creature filling her completely, driving her crazy with delight. The tentacles started to penetrate her faster. She was screaming in rapture with every stroke and she sensed that another orgasm was coming soon.
Her face expressed pure ecstasy as she began to buckle and shake violently. She reached an enormous climax. Her eyes rolled back into her head. With four appendages impaling the young woman, the beast kept rocking her convulsing body through the entire orgasm, which was much more powerful than the previous one.
"Ummpph! Yes! Ahhhhhggghhhhhh!" Sandra screamed as her climax overflowed her mind.
Her cunt and anus trembling around the tentacles, Sandra collapsed with exhaustion. But it was not over yet. Her belly looked a little distended by the tentacles churning and revolving inside of her. Sandra grunted with each pump, holding to the last threads of consciousness she had left.
Finally, the creature blasted its sperm inside her. Sandra gasped for air as the creature's body contracted again and again and pints of semen began spurting out of each of the tentacles. Within seconds Sandra's womb and colon were both full of cum but it just kept flooding her, unable to flow out due to the tightly packed tentacles blocking her holes. Her belly began expanding as more and more of the liquid filled her body. This rare and exquisite sensation brought Sandra to a new orgasm as she was pushed into an even higher plane of ecstasy. Her body was rigid; her eyes were fixed on the ceiling and her mouth wide open. More and more semen flowed into her, until she looked four months pregnant.
The tentacles buried in her ass filled her colon and her intestines, then her stomach, and then there was no other way out but her throat. Sandra felt a warm fluid coming up her esophagus. Then, her mouth began to fill up from the inside until it overflowed and a thin line of whitish thick fluid poured down from the corners of her mouth. She could barely catch her breath between each pumping of the gooey liquid that passed through her throat. The creature kept cuming inside of her until the fluid also started to leak from her vagina and anus. Sandra could not understand what the animal was doing to her but she loved it. A constant sense of ecstasy crammed her mind and she wished it could go on forever.
Suddenly the creature pulled out all tentacles and swiftly contracted them into its body. She was still under the trance of her last orgasm and with each spasm of her abdomen, semen spilled out of her mouth, every time less and less until it stopped. A filling of emptiness confused Sandra. At last everything was calm, and the ravished woman lay flat on her back, her eyes staring up vacantly, her mind lost somewhere between heaven and earth.
A long while later, Sandra woke up from her trance, bewildered and feeling empty. It took her a few minutes to understand where she was. She remembered the overwhelming sex, her new pet, everything. She sat on the bed, her head still spinning. Slime was dripping from her lips and she was still coated with the thick substance that dripped down her thighs. Without even thinking about it she tried to catch it with her hands and swallow it. It was so tasty.
It was then when her actual condition sank in. Sandra's belly was incredibly distended and she felt so full, she thought she was about to explode. Her body felt heavy. She looked down and rubbed her bloated stomach with her hands saying out loud to herself,
"Now what the hell am I going to do with this?"
She could feel the creature's semen churning inside of her. She decided to lie down for a while and rest. After her extreme experienced, this was not the time to worry about anything. She rested for a moment with her eyes closed. Despite it all, a great feeling of satisfaction cluttered her brain. Then, she felt something touching her again.
The caterpillar was moving and positioned itself between her legs. It was trying to attach a larger tentacle to her vagina. Sandra frowned and looked down at her crotch. This tentacle was different from the others she had seen before. It was thicker and had some sort of suction device at the end the size of a dinner plate. Dozens of small tendrils protruded inside and all around of it and in the center of the plate was a two-inch opening like a toothless mouth.
The beast attached the weird tentacle between her legs, covering her crotch from her navel to her anus. Sandra could feel little tendrils caressing her skin and penetrating inside of her wet cavity. She could also hear squishy sounds as the caterpillar's long mouth began to chomp down on her and suck her pussy like a giant vacuum. Soon, her mind was again under control of the pleasuring beast and it didn't take long before another orgasm wrecked her already exhausted body. Her blissful contractions helped the creature's sucking exercise and unexpectedly she felt something flowing out from her vagina. Not only a few drops but a large gush of fluid. The hungry beast urged her to give more, increasing its efforts and the sensation was overwhelming. Sandra noticed that her belly began to flatten as another climax exploded inside of her.