Ken decided to try out the book on the girl near him. Before he tried anything he wrote so anything he writes won't be noticed by all but him unless he writes that will be noticed by others. He then thought of the girl and what's on the page changed to info about the girl whose name is Kat with a picture of her body. You wrote changes done to her are happens in five minutes for each change before changing her age from 13 to 18. Ken watched as she aged as the minutes past her body growing up. He wrote that she has cat ears and a tail and watched as they grew on her head and the bottom of her spine. He undo the age returning her to 13 and then made her breasts bigger. He watched as they grew from b-cup to dd-cup.
'Wow this thing is damn cool. Let's make it so only I can use this thing.' Ken thought to himself. He undid the changes to the girl before thinking of the rules for the book. He wrote that only he can use or see the book with no one else being able to use it till the day he dies and then it's will do the same to the next person who opens the book with a explanation of what it is. It will appear to him if her does it have it. So what to do with it now?