It increases your penis size!

You start to feel weird. You fall to the floor and your penis increases in size. "OW! HOW IS THIS SUPPOSE TO HELP?!!" You ask your dad. "Relax Justin! The only way to counteract a spell like this is with a potion that has the same effect." you start screaming as the pain gets worse. "HOW LONG DO THE EFFECTS LAST?!!! WILL I ALWAYS FEEL THIS PAIN THROUGHOUT?!!" You are in so much agonizing pain. Your cock gets so large it breaks the seams of your pants and fall out.

"You will feel some pain at first, but it will settle down soon. The effects last about a week." says Jerry. "A WEEK! OH MY GOD!!" You scream out in reply. "JUST BE GLAD YOU DID THE SPELL CORRECTLY OTHERWISE IT WOULD HAVE LASTED 3 YEARS!!!" Jerry shouts back.

"In the meanwhile, try jacking off, it will help a bit." Your cock has increased to 16inches. Very painful.