What Matt didn't realize was that him tickling Ben not only freed him but also woke him up. As he saw Matt hurrying towards the bathroom he -or to be more specific his instincts- immediately knew what was happening to him. And caveman Ben liked the idea of another caveman being there to give him proper company a whole better than just having a normal person staying with him. Or maybe, just maybe he was the normal one? He was a lot more muscular, stronger, and certainly able to survive under any circumstances, unlike that feeble Matt.
But that wasn't a further concern for Ben now, especially since he had already lost a substantial portion of his former brainpower. Instead, he jumped up from the sofa with new found energy and walked towards the bathroom with a slight hunch.
Inside Matt stood infront of the mirror, his back facing towards the Ben as he was examining the damage done. "Fuck, what was I thinking? That's fucking disgusting, what the heck. Just look at yourself you idiot!" Matt was more angry with himself than with Ben, for the moment being atleast. Just as he was going to think of a solution he saw Ben in the mirror, standing right behind him.
Matt, startled by his sudden appearance, his enormous, unconcealed caveman dick and his strong musk flipped around on his heels and yelled at him. "Man, look at me! You did this! Fuck, we need to get this shit sorted out quick-" Before Matt could finish had Ben already grapped him and forced his face directly into his right armpit. Matt struggled with all his power, but to no avail. More and more hair revealed itself all over Matt's body, and once again the musk became a pleasant one, drawing him into trance. He eagerly inhaled the caveman's odor despite his mind begging him not to. As he did, he could feel his nose broadening aswell as his entire face pushing out into a more simian shape.
His muscles and bones extended, including his now giant cock, letting him grow from 5.6 to 6.1. To cope with his his new height his back shifted ever so slighty, forcing him into a hunchback's stance. He gained muscles all over his body, loving and embracing the changes, becoming hard and leaking precum onto the bathrooms floor. Matt now forced his face into Ben's armpit all on his own, gaining more and more hair all over his back, face, his legs and at his groin. With each turf his mind got fuzzier, and all rational thought vanished. Instead, all he could think of where food, breasts, sex and women.
Neanderthal women.
Matt was no longer Matt, but a dirty, filthy, stinky caveman. And he loved it. With a triumphant grunt Ben released his newly "improved" friend. Matt grinned at Ben with his now much wider mouth. "This much good." he spoke in a unnaturally deep voice as Ben grinned back happily.
Through his transformation Matt had become rock hard and now started to stroke his giant cock. It didnt take long until he sprayed his thick, yellowish neanderthal cum. Matt knew that his cum, musk and saliva may do to others what Ben did to him. While Ben was still quite a bit away from turning full-on-caveman had Matt been transformed into a complete neanderthal.
Then, just after Matt got up,...