Matt was absolutely disgusted with his friend; he had leaked neanderthal precum all over his blanket and his room. His friends crotch was absolutely bulging out of his boxers. Ben had an erection, and there was no hiding it. The hairy mess of pubic hair all over Ben's groin was very apparent, as well. "God, the room stunk", Matt thought to himself.
"Ben, go to the bathroom and take care of your 'problem'. I am not comfortable with my friend having a throbbing erection around me!".
Ben grunted in relief and ran to the bathroom; he now had permission to jack off! He is the horniest he had ever been in his life! He slammed the bathroom door shut and ripped off his incredibly tight underwear. His manhood flopped audibly out, and sprayed precum everywhere. God, it was leaking like a hose! Ben examined his cock and blushed. It was about 10 inches long hard, with thick veins all over it. He blushed out of embarrassment; it didn't even look human anymore! It was long, thick, leathery, uncut, and hairy. Also, it looked like a leather type of sheath was slowly enveloping it!
He wrapped one hand around his rod and began to pump. He began grunting in an incredibly deep animalistic voice; he didn't care if Matt heard him, he had to cum! He looked up at himself in the mirror. He looked asolutely crazy! He didn't even look like himself! He was incredibly hairy, had a bulging brow, and a massive cock! On top of this, he stunk horribly! While jacking it, Ben lifting one of his arms, letting the thick, matted jungle of pit hair spill forth. He took a deep whiff. god, he reeked! And he was beginning to sweat even more from jacking it!
How much more could he change? he still had 20 hours to go until the chronivac was completed. How gross, devolved, and hairy could he get. This line of thinking pushed him over the edge! He grunted as he came and came and came! At first, it was small spurts of normal, white, human cum. After a few small shots, a massive load spattered out all over the mirror. This load was different; it was much thicker, chunkier, and yellowish. It was obvious that neanderthal cum was different from human cum! Spurt after spurt, he just kept going. When it was finally over, he let go of his cock. It went limp and pointed downwards. His simian spunk still dribbled out, though, leaving a stinky yellow stain on the rug. Ben leaned in and sniffed his chunky caveman cum. UGGH! It absolutely reeked. Who knew his cum would be so much smellier as a caveman?!
Ben sighed, his sex drive relieved, for now. He ripped off some toilet paper and began to clean up the bathroom after himself.