Jeff selected the "neanderthal loincloth" option and pressed ENTER.
Jeff got out of his chair as a window popped up on the computer screen.
"NOW INITIATING LOCATION/TIME CHANGE"
Jeff watched as his clothing vanished, leaving him stark naked.
Not really worrying about his sudden visibility, Jeff watched his room morph into what appeared to be a cave.
Jeff groaned as his physical transformation began. Jeff groaned as his hair began to elongate. He began to age, until he was about 24, and his new human male stubble began to elongate as well, beginning to form a light beard. His hair joined with his beard, and the hair began to spread until it stopped below Jeff's neck.
Next, Jeff felt himself shorten, but only a little. His body suddenly exploded with muscle. His biceps were huge and his legs felt like tree trunks. He flexed his biceps.
"Cool." thought Jeff.
Jeff felt his penis tingling. It grew a bit. Jeff felt his spine changing, and he could also hear it grinding. His face pushed out from his head, which shortened. Jeff looked like a ape man.
Jeff's brow became more pronounced. His feet cracked as they grew larger than average human feet. Finally, hair began to sprout all over his body. Jeff ran his massive hands through his chest hair, delighting in the tingle he felt as the hairs lightly hit his chest as they went back into place.
Jeff noticed a worn, tattered and dirty leather loincloth had appeared on him. Having finished his transformation, he exited the cave, ready to see what life as a neanderthal would be like.