Try to use the book to undo the change

As hard as you try, you can't seem to remember what you were looking for. For some reason the letters don't make sense anymore, and your back is beginning to ache due to the weight of your engorged breasts. A thought flashes through your mind briefly, thinking that you should try to undo the change, and you start to turn the pages of the book to find a reverse incantation. However, as soon as the thought passed through your mind, it was gone.

Pages flip by, but you don't have any help from your brain at what you're looking for. The only thing you can remember is something about getting smaller, but you don't know why, or even what the image looked like. Frustrated, you decide to start over, closing the book and opening from the front. Within a few pages, you find one that has two men, where the one on the left has a noticeably larger penis.

Possibly due to lingering power of the book on your mind, you somehow decide that this is the correct page, and when you try to say the sentence, it impossibly works, the words coming to mind. "senip eht enlarge"

The strange sensation takes over, a sense of growing centered in your groin. Within a few seconds, you feel something pushing up against the leather of your pants, and pull them down to check. You've grown a penis, several inches long while still flaccid, and as you watch it starts to grow hard, quickly extending from your body until it reaches a full seven inches in length.