The amazing anthro book

You look around the shelf looking for something that catch your attention but every book seem the same, you grab one, read few pages than put it back, than another one and another one...

"There's nothing special here" you think, but an old book catch your attention, is colored with a dull red, is covered in dust and the title is "THE ANTHRO BOOK".

You leaf through some pages, it seems like a spell book for turning a human into an anthro creature... THIS! This is what you were looking for, something weird as fuck.

You buy it and make your way to your house, meanwhile you call your best friend Marcus and invite him to your place to show your last discover.

Marcus isn't just your best friend, he's like your imaginary friend, he knows everything about you and you knows everything about him, you share every passion also the kinkiest, of course you are both heterosexuals is just funny to know the deepest desire of the other one and the demi human always fascinate you both.

You arrive at home and your step mother gives to you a warm welcome by totally ignoring your presence, she was always rude but when your father dies years ago the situation get worse with her.

You go straight into your room and wait for the arrival of Marcus, he doesn't make you to wait and after 20 minutes you can hear your stepmother, "oh it's you... Again..."

Marcus open the door of your room," hey bro, wassup?!" After your hands slapped you take the book and show it to him, "The anthro book? What is that?"

You open the book and leaf through the pages,"It contains a list of spell, it seems this are all for turning peoples into some kind of demi human..." You keep reading curiously the book: every chapter is dedicated for a different anthro creature divided for male or female.

Marcus steal the book from your hands, "just imagine if it works... Hey look! This is a spell for a donkey cock," he looks at you with an evil smile than proceed to read some words in a language you never heard.

"Ha-ha that's funny, I'm sure it wor-" your sarcasm is interrupted by a strange sensation under your pants, you feel your cock tingling and growing weirdly.

"Bro? Are you okay?" Ask Marcus, you don't answer, you are focus on your dick... What's happening? He keeps growing more than its normal length, your pants fell extremely tight and start to hurt so you take it off and you and Marcus remain stunned by the view.

Your cock is getting longer and thicker till it reach the size of your forearm, is hard like rock and you can feel a growing arousal, "undo it... UNDO IT!" Marcus find a spell as find as he can and after he say the arcane words your cock magically regain is normal shape.

"What have we just witnessed?" Ask Marcus, he's gaze is a mix of shock and fascination," This book... Is powerful as fuck!"

You breath a sigh of relief after checked that everything is normal than you look at Marcus, "We have to study this book accurately..." Your lips draw a smirk," than we'll have so much fun my friend..."