Matt was changing alot faster than Ben, but at least he wasn't moaning about every little thing anymore.
"How are you feeling? " asked Ben.
"I feel fine... better than fine actually" replied Matt, his voice already much deeper. He took off his shirt revealing his obvious muscle growth. His body was still smooth for the most part.
"Uhm, Matt. I think you should put your shirt back on" Ben said, realizing that he didn't have as much control over his urges as he thought. But it was too late. Matt was changing at an alarming rate and soon would catch up to Ben. Matt took off his pants and his huge leathery member flopped out pointing straight at Ben.
"I be with you now" Matt grunted. Clearly his mind was devolving too now. Why hadn't this happened to Ben? was it the last to go? These thoughts left as soon as Ben realized he had another problem. He looked down at his own leaking member then back at Matt. The room was filled the sweet stench of simian pheromones. It was getting hard to think. Ben's body was on autopilot and lunged forward embracing his barely human friend. The lust seemed to speed up the changes as they became more muscular and hunched. Matt's feet elongated and broadened from a size 10 to a size 17, his big toe stretching further from the rest almost resembling that of an ape. By now they were mating like rabbits, taking turns with eachother, completely lost in extacy as the last bits of humanity left them. Finally the two teenage cavemen lay spent on the couch, grunting and breathing heavily.
"Me sorry me be angry. Me glad now you make me change like you" said Matt in a deep bestial voice.
"yea, this be fun. Me hungry now. Lets get food and see what else we do with croni... uhm machine thingy. "
With that the two raced eachother to the kitchen and raided the fridge, the pantry and everything else. Matt's mom is going to be in for a surprise when she gets home.