The Experiment
Copyright© 2025 by Naughty Sarah
Chapter 18
Romance Sex Story: Chapter 18 - A device that alters reality. Simple, right? Now, instead, what if it could alter humans? Two people experience "thought amplification", itself amazing, but then go a quantum leap forward in body swap/modification. Adventure? How about SEX like you've never felt, never imagined before? Wrap this ultra-human experience around a growing love story (love triangle?) and you have The Experiment! It's the quintessential EROTIC adventure never before experienced by humans. Sex starts slow but HEATS UP!
Caution: This Romance Sex Story contains strong sexual content, including Ma/Fa Fa/Fa Consensual Romantic BiSexual Heterosexual Fiction Restart Workplace DoOver Time Travel Body Swap Group Sex Bestiality Cream Pie Masturbation Oral Sex Sex Toys Voyeurism Transformation
Unlike before, she hadn’t grown a bit. He couldn’t have climbed over her legs, even. He started to walk away from her, as if he was having second thoughts about being subjected to it all. Katie would have to do this one.
She grabbed him, as he was walking away. Her grip was gentle, and she wrapped all her fingers around him to hold him. She brought him close to her crotch. Her other fingers went inside, and she rubbed him, coating him with her slippery fluid. She had to lubricate him to get him inside. She held him on his back, her hand around him.
She leaned back. The time was here. She poked him towards herself, with his feet first. His feet bumped up against her skin, very close to her anus. She brought him up, and with one hand opened her pussy. His feet and legs slipped effortlessly inside. It was warm, soft, and infinitely more realistic than before. He could feel every response of her pussy as he slid inside.
Katie pushed him in, past his knees, telling him to hold stiff. He wouldn’t fit otherwise. She let go, and grabbed him again, higher up. This time she pushed him in past his waist. Her cunt, inside the lips, was sucking at him. She let go again, and laid down, no longer looking. She raised her knees.
Elsa watched with intent as her pussy began sucking. He’d move out a bit, then in, each time a bit deeper. Jason realized that he didn’t want his arms to be last inside; as his chest was pulled in, his put his arms at his sides, letting Katie grasp them and pull them in, too. Katie took a deep breath, and pulled him in, up to his neck.
She took a few deep breaths, breathed the words “Say goodbye!,” and with another effort, expanded her pussy, sucking Jason in completely. Her lips slid around his head, brushing against his ears, and, as he was pulled into the hole, closed.
This time, Jason was able to see Elsa’s curious face right up to the time when Katie’s pussy closed. Elsa, still shocked, hesitated before pulling Katie’s labia apart with her fingers. By the time she did that, Jason had disappeared into Katie’s pussy beyond where she could see him.
“He’s gone?”
“No, he’s inside me. I can feel him. Like that.”
“What’s it feel like?”
“It’s kind of like having a man inside you. I mean-- a cock, kind of. Except--” she giggled-- “this one knows right where to touch you!”
Jason was having a tough time moving his arms around inside her. Her pussy was very strong, and it was a tight fit. He decided to find a sensitive spot inside her-- it would be interesting to Elsa to see Katie come with no outside stimulation.
“Can I talk to him?” Elsa asked.
“Well...” Katie put two fingers inside, to open a space for Jason to talk through, but he was too deep. She pulled her fingers out, and her pussy snapped closed again. “Oh, of course. Go ahead.”
Now Jason could hear the outside world, where all he could hear before were the rumblings of Katie’s intestines, and heartbeat. He could breathe, so he was able to answer. His voice, somewhat muffled, came from between Katie’s legs.
“How is it in there?” Elsa asked.
“Warm and cozy. Really wet too. Even wetter if I can find...”
Katie giggled again. A powerful contraction of her pussy nearly crushed Jason.
“Look up, not too far inside. That’s where mine is.”
“Fine,” came the voice. “But where’s UP? There’s only in, and out.”
“It’s kind of rough. You’ll find it.”
Jason reached up. He could just reach a rough spot with his fingertips. He used his legs to try to climb up, but couldn’t bend his knees. He slipped, and the tightness forced him further in. His feet were caught in her cervix.
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