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Sisterly Experiments (Peekaboo x ChrisGabriel)

"Yuck. I hate needles!" it seemed that Tamara's tantrum would start before her crying... and the crying would start after the needle gets into her body... But surprisingly she was a little submissive and both ended just after they started...

The blood had nothing interesting in it at the first eyefull, but the lab equipment would show otherwise. She was very parched, and drank a lot of juice. And Tamara's new pods - or cocks as it seemed - would be turning out of her vagina, and slowly filling with blood... To her horror and excitement.
 
"Oh stop being a baby, you're in high school so start acting like it will you? Sometimes I wonder how we're related" Tanya rolled her eyes once she had taken the blood, going over to her equipment to begin analysing the blood sample, keeping the cum sample for later. "Hmm.....your DNA is still mostly human but....it's been modified....and it's like it's not stable.....constantly shifting and changing.....hmmm...." Tanya was so focused on the computer screen she wasn't even paying attention to what was happening to Tamara.
 
Tamara looked at herself with wide eyes. Her sisters jacket the only piece of cloth she had on, and now her nude, hairless body gave birth to something frightening, and arousing... She slowly touched the two groving cock with her fingers, and they twiched, and she felt them too. "Wow..." was the light sound of bewilderment from her, before she lightly grabbed the two hot and still growing appendages, and felt like her clit got licked!

"Sis... there is something very wrong with me..." but of course the hands of her closed around the meat and she tried to feel what she could feel from them.
 
"Yes Tamara I know.....that's why we're here. Now try to stay quiet while I try and see what's going on..." She tapped at the computer screen. "Hm....it's like there's something else mixed in with the blood....like something bonded itself to the DNA itself.....fascinating....I wonder if I can extract some of it...." She started typing a few things into the keyboard, bending over and sticking her ass out towards Tamara slightly, her tight skirt pulling a little tigther.
 
Tamara moved her little hands faster on the two thumping cock, the growth producing two bigger erections than her lower arms. Her eyes glazed over, she slowly licked her lips at seeing her sisters ass sticking out. Her nipples wriggled a little, and she moaned as something started to open her pussy from inside. Her asshole was pulsing similarly, but it was just one tentative tentacle emerging from her core.

Grabbing the two aroused cocks and pulling on them like a man masturbating for the first time in his life, Tamara really got on the horse-like cocks stimulation, and the tentacle from her pussy slowly neared her sisters skirt and upturned ass. Her lithe fingers started to gather precum from her own two meat rods, and slowly tried to get them smeared on her own nipples, lifting the cocks toward her breasts, hugging them to her stomach. Two small tendril emerged from her nipples, straight into the two openings on her cocks, just like her long tentacle darted inside her sisters skirt, seeking one of her openings, and trying to get inside.
 
Tanya was so distracted she didn't notice Tamara pleasuring herself, nor did she notice something emerging from her sisters body and slithering across the floor toward her. "Very....very interesting.....now....maybe if I put the sample in a-" She gasped as something suddenly darted into her skirt, seemingly pushing against her panties, before ripping through the fabric and into her pussy. "AH!" She gasped and clutched at the desk infront of her, panting and slowly looking over her shoulder. "T-Tamara? What the hell are you doing?!"
 
"Fuck!" she moaned, when the feelings from the tentacle bursting into her sisters croch reached her, and the two pods in her hands joined in her pleasure, the little tendrils from her breasts filling up her cocks from inside... Tamara almost lost herself in the otherwordly orgasm.

The tentacle surged more into Tanya, the orgasm of the host body making it get bigger, as the two cocks on the younger girl could not release their load, so that too surged through the tentacle to spray the oldest full of sticky cum. It would harden and fill her whole inside as a silky cork, and while it hardened to its stone like state, it got big enough to strech her vagina and even open up her cervix a little. The tentacle fucked Tanya until the new hollow dildo hardened fully.
 
"T-Tamara stop that!" Tanya squirmed, then gasped as the tentacle suddenly started growing thicker. "Nnngh!!" She grunted, then grasped the desk tightly as she felt some kind of fluid begin to erupt inside of her, before starting to quickly harden whilst still inside of her. "Wh-what....what's going on? Wh-what is this stuff?!" She gasped as her belly bulged and started to stretch her clothing, her cervix even opening up to give the tentacle, or anything else, further access...
 
Feeling the way opening up, the tentacle pushed the hardened pod deeper, while the body of Tamara produced more of the silky fluid, to keep making the walls of the hollow dildo. Meanwhile streching Tanya's vagina more, finally the tentacle was even smaller then the space it created, and could flick inside the woman, causing a feeling like a beat of a drum.

Tamara recovered enough to feel the need to dring, so she crawled at her sister, and started to lick up her fluids, finally reaching her streched out pussy, and sucking on her clit to get more. The tentacle and her two cocks slowly returned to her body, but Tanya's hollow plug stayed inside her, keeping every crease and corner occupied inside her vagina, so she could not even orgasm.
 
"T-Tamara! St-stop this! Stop it! Take that thing out right now!!" Tanya squirmed as her younger sister started to suck on her clit, shivering as the tentacle withdrew but left that solid thing inside of her. "Wh-what the hell is inside of me?! T-Tamara stop it and let me help you! I.....I can find a way to undo this! To turn you back to normal!" She couldn't help but moan as her pussy was licked, groaning softly as she felt the large dildo like object shifting inside of her, keeping her stretched out.
 
Tamara kept licking her sister, but slowly recovered her wits. "Why I am doing this?" she asked herself silently, but got aroused by her older sibling's discomfort, and sexy moans. "Oh, what is this hole? And why does it keeps her open?" she thought, and touched the insert in the gaping cunt. She almost laughed out loud, when her hand went into deeper effortlessly. She kept sucking, while trying to find something to grab or pull, finally reaching with her half arm inside, and touching the narrowing of the object with her fingers.

It seemed to turn slightly into the uterus, so she could grab it, and give a slow pull and push, slowly fucking motion. She even tried to turn it slightly, liking the reactions of her sister, and looked at the moving bulge under the skin on her stomach. It was a fun game, and she loved making Tanya squirm, so she even kept doing it when she felt the end and her sisters pussy lips close around her arm when she could finally orgasm, filing the youngsters mouth with female cum.
 
Tanya's eyes widened when Tamara started to insert her arm into her pussy, grasping at the object inside and beginning to twist and move it, Tanya's stomach bulging slightly through her shirt. "NNnnghhh.....T-Tamara d-don't.....t-take that thing.....take that thing out!" The girl was panting heavily, the pleasure building up quickly. Her knees were beginning to buckle, then she let out a scream as she came violently, her pussy tightening up whilst juices began to spray everywhere from her.
 
Tamara lapped up the juices happy, and moaned out her answer to her sister. "I won't ... take ... it out ... as you just ... asked me!" But she moved her hand with bigger pulls and pushes, even turning it slightly, making the stone hard silky glove on her arm really open up Tanya - even rearranging some of her insides. It felt to the older girl like her sister tried to turn her insides out by grabbing at her sex.

Tamara's tongue meanwhile slithered out more, the small appendage looking like a tentacle, and it lapped at both of their bodies to gather more of the sprayed out pussy juices. The younger sisters asshole started to dilate, as was her cunt, causing her arousal to skyrocket.
 
"T-take it out!" Tanya squirmed as she came down from her orgasm, only for the pleasure to begin building up more as Tamara's long tongue began to work at the bottom of her body. "L-let me help you Tamara....j-just stop this....restrain yourself and....and I can help you..." She panted heavily, feeling rather strange inside, shaking her head as the odd sensations continued to build up.
 
"I try, my sister, I try! And yes, help me restrain me, help me come too!" moaned the youngster when finally the extra long tongue returned with the yummi wetness. She tugged at her arm, sensing that she could not remove it without the hard long sheat of silky dildo. Pulling and turning the big toy she finally could feel the hotness of her sisters body, as she fucked her to the next release.
 
Tanya cried out as Tamara's arm continued to tug and move, shaking her head. Oh god how long was this thing going to be inside of her? It felt like whatever material Tamara had been cocooned inside.....hopefully this would dissolve soon aswell like that had. "Nnnnngh...." Tanya groaned as she already began to feel her next orgasm approaching, panting heavily as the incredible pleasure began to build up once more.
 
Tamara movements got bigger, as her sisters body got accustomed to the changes she was making in her with the silky stone-dick. She could feel it plunging repeatedly through Tanya's cervix, and this opening up of her sister aroused her greatly.

Her pussy dilated and disgorged the two cocks, that started to inflate rapidly, but there was the tentacle too that started lapping at their legs. Her ass also throbbed, as slowly there appeared a tentacle too, but this was less agile, and more covered with silky strands of wetness.

Tamara's nipples displayed their thin tendrils, and with the help of the aroused teen they found Tanya's nipples under her clothes, clamping on them like small fingers. This helped her reach her orgasm that moved earth and sky, but more importantly it caused the older to fall into the hands and tentacles of her sister, who finally pulled the plug out. - Tanya lay on the floor with open legs, Tamara on all fours over her, her two dicks between their stomach. Their nipples joined by the tendrils that burrowed into the orgasming female. - And there was space for the younger sister's tentacles to dart inside the older, the one from Tamara's pussy helping the other that come out of her ass, fully leaving her body just to be able to penetrate straight into Tanya's womb, where it would join with her body to form a symbiosis.

As both female got their orgasm, their body sinchronised on an unconscious level, creating a link that would make them receive the same feelings of arousal that the other feels, thus making their later "games" more fulfilling and their possible happenings more frequent, even without the tentacles hormonal attacks.
 
Tanya squealed as she felt something thin wrapping around her hard nipples, finally giving them the attention that they had so craved. As Tanya's orgasm hit her, she nearly passed out, her body falling as the pleasure overtook her. The next thing Tanya knew she was on her hands and knees, panting heavily, feeling Tamara ontop of her with those two huge cocks between their bodies. "T-Tamara....stop....no more....please..." She panted, then cried out as a tentacle rammed into her pussy, thrusting right up into her womb. Tanya let out another scream as her womb was stretched out, closing her eyes tightly.

"T-Tamara....wh-what are you doing?!" It felt so weird....Tanya could feel her womb being penetrated, but at the same time she could feel.....she felt like she was also the one doing the penetrating.....
 
"I .. do ... not ... really ... know!" Tamara cried out in her orgasm, as her body worked on Tanya. She just lost her footing, and fallen on her sister, when the bigger tentacle left her ass, and the one in her cunt slithered back, causing her to feel the retreating movements from both the going out, and both the going in perspective.

Her nipples also lost their contact with her sisters, the tendrils returning, but making her breasts explode in another orgasm. Now only her two thumping pod-cocks remained, in a real hot and red full erectioned state, and she could do nothing more than thrust them inside her sisters cunt, helping with her hands.

"Oh, sis! You are really open!" she moaned as both her lower arm thick cocks got into the wet cave of Tanya. It was a close fit, but oh so good! She somewhere lost the hollow cock from her arm, but now she wanted something to fill her empty ass, so she tried to look for it. Then falling to her side she pulled her sister into a hug, her two cocks filling the hole fully, and compressing her clit she started to shoot inside the moaning older girl, reaching her own orgasmic place again. "Oh, fuck me! ... In the ass!" she cried out, while the double barrels fired their thick cum into Tanya, cementing the new addition into her womb.
 
Tanya gasped when the tentacle withdrew from her pussy and ass, leaving her empty for a few moments, though it wasn't to last long it seemed. "W-wait! Not both! They're too big!" Unfortunately her protests went ignored, Tanya letting out a scream as both of Tamara's mammoth cocks began to penetrate her pussy, practically splitting the older sibling apart. Despite the earlier fucking, Tanya had a naturally tight pussy, and just one of those cocks would stretch her. Both on the other hand was just far too much.

"Wh-what? F-fuck you? H-how can I fuck you?! I don't have anything to fuck you with!"
 
"But you will have something next time, if I am lucky!" Tamara moaned, as her double cocks throbbed inside her sister. "Look for that dildo you had inside you, that would do nice!" she also was on the lookout, but her hands grabbed Tanya's hips as she started to fuck the older sibling slowly. She was not that hard after the cocks had cum, but the feeling was extraordinary, and she pumped at the silky plug and into the tightening pussy just for fun.
 
Tanya didn't know what Tamara meant by saying she'd 'have something next time' and to be honest she didn't really want to find out. The older sibling groaned as the two cocks softened slightly, making the fucking a little easier on her body, but they were still hugely long and hugely thick. "Nnnngh...." She twitched and stretched, unable to even think about looking for the dildo, let alone actually try looking for it. "T-Tamara....I.....g-god....I'm gonna....c-c-cum....."
 
"Oh, sis! Thats great!" she moaned, and lay down on her sister, hugging her and thrusting her breasts at Tanya's back. She started to play with her hanging breasts too, while the two hot nipples and pillowing breasts created extra feelings on her siblings skin. The two pumping cocks filled the older girl, pressing out all the air and fluids, creating an airtight hot plug for her pleasure.

"Hmmm! I love how you feel around me! Next time can you hug me too?" Tamara asked dreamily, while her pussy tentacle started to emerge again, and fuck her ass, just as she wanted. The moving meat created the double feeling of being fucked in both holes, as it went out from her twat, and sank into her ass, then the other way around. The root stayed in her womb for the whole time, but the end thrust deeper and deeper to fill her bowels instead of the other tentacle that now housed inside her olders sisters body.

And of course they both felt the arousal from the other, thanks to their new subconscious link. So, Tamara neared her own orgasm surely, and causing her sisters one to become two, then the repercussions making them come a third time together.
 
This was getting too much for Tanya to take. The sensations being inflicted onto her own body were bad enough, but she could also feel whatever Tamara felt too....feeling the sensation of having those cocks, of having a tentacle growing out of her pussy and into her ass, along with the sensation of the two massive cocks already pumping into her. "Oh fuck...." Tanya gasped as her younger sister grasped her hanging breasts through her clothing....Tanya had always been rather sensitive there...

"NNNGH!" Tanya screamed as she began to cum once again, her pussy juices spraying liberally whilst her body tightened around the two cocks buried within. "P-pull them out Tamara! D-don't let them cum inside of me!"
 
"Why not? I want to!" she hugged her stronger, turning them on her back, and while Tanya was laying on her like a turtle, she hugged her with her legs too, keeping the peaking woman in her place, orgasming herself too, cumming in her cunt, her ass, and feeling her cocks dribble more jism into her sister too.

Tamara could not even utter any voice, while she hugged her sister, the great feelings overwhelming her young body. She just wanted to give her stuck up sister something to have fun with. That it also teased and exasperated her was a bonus.
 
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