Gavin couldn’t believe he just caused his classmate to dissolve in his balls. And that the teacher wasn’t concerned one bit. Gavin felt a peculiar tingling sensation as his unwieldy, prehensile appendage began to retract. Slowly, it shrank back down, the exaggerated girth and length receding until it settled at a still-impressive but manageable nine inches. Despite shrinking, it was way longer than his original 6.7 inches, as such, Gavin had to suppress his glee over something so trivial as cock size at a time like this. Gavin’s body still hummed with an unbearable, insistent arousal. The constant tingling warmth radiating through him made it nearly impossible to think straight. His shaft throbbed persistently, a bead of precum already forming at the tip, and his swollen balls, extremely bloated from a Johnathan-sized amount of cum now stored within, ached with unspent need.
“And now class, we are going to demonstrate sexual intercourse that leads to fertilization.” Mr Scaftie explained.
With instruction from the teacher, Murray spread his legs, lifting his plump testicles away from his freshly grown vagina. Gavin positioned himself between Murray’s legs, both boys were bright red from embarrassment. Not only do they have to be intimate with each other, both being very inexperienced with sex, but they must do so, in front of all their peers.
With a deep breath, Gavin carefully guided his cock into Murray’s waiting entrance. The moment the tip pressed inside, Murray whimpered in shameful pleasure, clearly struggling to suppress his reaction, but the intensity of the sensation was impossible to conceal from their onlookers. The classroom buzzed with a chaotic mix of reactions. Some students laughed and cheered, while others jeered with taunts like, “Buy him dinner first!” A few turned away in embarrassment or disgust, while others exchanged wide-eyed glances, torn between shock and fascination.
As Gavin slid his cock deeper into Murray, he began to thrust back and forth. They both started to moan in pleasure as the thrusts began to become more rhythmic. For Murray, the sensation of having a cock inside him was an overwhelming mix of strangeness and intensity. His newly-formed anatomy, hyper-sensitive from its recent transformation, responded to every movement with sharp, almost electric pulses of unfamiliar pleasure. The pressure and fullness were alien yet oddly satisfying, stirring sensations he had never experienced before. It was as if his body was instinctively learning to accommodate, each shift or stretch sending waves of tingling heat radiating through him, and a wet sensation as his pussy became moist with pleasure. Conflicted emotions churned within—embarrassment, curiosity, and an undeniable, shameful arousal he couldn’t ignore. Another thrust pushed him over the edge, causing him to cum again, a spray of semen erupted all over his face.
Before long, Gavin's heightened arousal became too much for him to contain. With an ear piercing grunt, Gavin started orgasming and fired short after shot of cum deep inside like a pressure hose. His cock pulsed violently as it deposited the vast quantity of what was once Jonathan directly into Murray’s womb. Murray gasped as the warmth and pressure built inside him. The sheer amount of sperm cells entering him was overwhelming, filling him up faster than anything he had ever experienced. His belly began to swell almost instantly, the feeling of being stretched from within unlike anything he could describe.
Mr Scaftie was quick to explain what was now happening, the sperm cells racing each other to fuse with the egg in the fallopian tube. The class watched in a mix of fascination and disbelief as Murray’s stomach visibly expanded, his once-flat abdomen pushing outward as if several months pregnant. Gavin groaned softly, his cock still releasing, while Murray instinctively placed his hands on his growing belly, feeling the weight and tension as the mass settled inside.
By the time Gavin withdrew, finally spent, Murray lay panting. His stomach now massive, stretched tight, and carrying the melted remains of Jonathan, much of which was oozing out the now unplugged lips of his pussy. The teacher assured a few freaked out girls that the volume of semen filling Murray was extremely exaggerated due to the simulation’s requirements, and normally male ejaculation produces roughly equivalent to one-quarter to one teaspoon of semen and would not cause anyone's stomach to expand as Murray’s has.
Helping Murray off the desk and over a plastic container, Mr Scaftie collected the majority of the escaping cum as it gushed out of Murray’s pussy from gravity. He also thanked Gavin for his participation and asked him to return to his seat. Gavin, feeling light headed from the amazing orgasm he just experienced, fairly nodded and dragged his balls back to his desk. His friends whispered friendly support as he sat back down on his large but empty balls.
Once Murray’s belly had shrunk back to a normal size and the container of cum stored away for later use. Mr Scaftie had him lie back down on the desk and injected him with another syringe.
"Well done, boys. Now, normally Murray’s womb would be busy growing a baby Johnathan for the next nine to ten months. However, as we can’t have this demonstration take that long, I have injected him with a chemical that will speed up the fetal development so that Murray here will be ready to give birth to our new Johnathan in class tomorrow.”
He brought out another device called an ultrasound. Mr. Scaftie carefully placed the ultrasound wand against Murray's swollen belly, and the screen at the front of the class flickered to life, displaying the contents of Murray’s womb. He explained to the class how one of Gavin’s sperm cells would fertilize the egg carrying Jonathan's DNA, creating a zygote. With the experimental process accelerating cell division, the students watched in awe as the single zygote quickly began to multiply, forming a visible cluster of cells. Over the next several minutes, the development sped up, and the class observed the rapid transformation from a clump of cells into the early stages of a fetus. Gavin couldn’t believe that he was watching one of his classmates become a new human body in front of his eyes. The room was silent, except for Mr. Scaftie’s clinical narration, as the impossible unfolded before their eyes.