While Kevin and Jeff discussed what to do, Prehistoric Rose was trying hard to recognize those two figures in front of her (her mind could barely make out that they were two males).
Jeff approached the new cavewoman to study her more closely, but as soon as he got close Rose smelled Jeff and she rushed to mate, hitting the desk the laptop was sitting on. Kevin, scared of cavewoman Rose (she was taller than him) began to run, without realizing that while the laptop fell, the Chronivac went into operation and one message appeared:
"Make mental changes and restore physical ones"
As the prehistoric Rose tore Jeff’s clothes, leaving him completely naked, she began to feel strange and Jeff managed to free himself.
"Okay, now where is Kevin?" Jeff said, who realized that the camera on his laptop was aimed at him and Rose, with the Chronivac running.
After a series of screams from where the laptop was located, Kevin, who had hidden to avoid getting caught by Rose, checked what had happened from his hiding.
What he saw left him speechless: Rose had returned to her homo sapiens form, but from the shadows a naked Jeff appeared, grunting and wondering where he had gone.
Seconds later the Chronivac's voice command exclaimed: "Process completed, the minds of the figures in the photo were restored to a Neanderthal state!"
After recovering from the physical transophrmation, Rose noticed that she was facing a naked man who had begun to touch his genitals, grunting ecstatically.
The naked cavewoman turned around presented her ass, waiting for the devolved Jeff to make his move. Jeff put his dick into Rose's waiting pussy which she moans pleasurably and they started to humping each other.
As the two went on, a horrified Kevin who had to do something and ran to retrieve the laptop.
As soon as Kevin took the Chronivac, Jeff became aware of another male presence and jumped up, leaving Rose with her ass in the air, starting to chase Kevin to attack him.
"Hey Jeff wait! Maybe i can get you back to normal!" Kevin said, trying to take a picture of Jeff.
At one point Kevin starts to feel weird in his head and collapsed. Out of the corner of his eye he saw that the Chronivac was still running.
Once devoled Jeff reached Kevin, he found a naked and unconscious Kevin and decided to carry him over her shoulder and analyze him later.
After returning to Rose, impatient for having left her in the climax of the act, he put the devolved Kevin on the floor and lunged at Rose to finish making prehistoric love. After a while the two came and lets a loud and ecstasic scream, Rose curled up on Jeff and began to groom his hair.
Meanwhile Jeff thought with his mind devolved what to do with Kevin...