Ken tapped his pencil for a moment before thinking about what he wanted to do. He would change the entire human race! And he already had some ideas.
Turning the pages of the book until he reach the ones describing the human race he started to edit things. "Humans now eat through the asshole, and poop and piss through the mouth." Ken wrote, saying what he was writing as he did. Suddenly Ken felt strange as he looked at the diagram for human anatomy. It had changed considerably, and Ken was starting to alter to match his changes.
His teeth and tounge melted into his mouth, leaving it a hole on the center of his face as he pulled his pants and underwear off and felt his asshole, which now has a set of teeth in it, and a muscle he was sure was his tounge.
"Nice." Ken said, surprised as his voice came out of his former mouth. He had expected it to come out of his asshole, but it didn't for some reason. "Whatever." Ken muttered as he sat but naked on his chair to continue writing. "Humans have no nudity taboo, and nudity is common." Ken wrote, throwing his shirt off so he could continue writing.
"Humans are quadrupedal." Ken wrote, and as soon as he finished writing his hips snapped and he helped in surprise as he fell to the floor, groaning as he got back up he naturally got into a quadrupedal stance. "Sweet." Ken said with a smirk as he grabbed his chair, climbing back into it before pulling his legs in and sitting born like a dog would in his chair before grabbing his pencil.
"All humans are female." Ken wrote as he started to change. His hair grew longer as his body hair dissapeared. His penis shrunk and was replaced by a vagina as a pair of breasts grew from his chest and his body compressed into a small and petite one.
Ken then smile as she wiggled in her seat to get comfortable. "Humans have paws." She wrote, replacing feet with paws as she looked down at her feet. They compressed as pads formed on them her feet becoming a pair of paws as she smiled.
"Humans have three rows of breasts." Ken wrote as her skin bubbled, two more pairs of breasts forming below her first pair as she smiled and wrote in her last change for now. "Humans have long tails that can function as a separate hand." Ken wrote as a tail shot out above her butt, Ken twisting it with a smile as she grabbed the notebook with her tail and spun it in her tail before putting it down. "Now to go see the new human race." Ken giggled as she hoped out of her chair onto all fours.