"Okay... so if I run to the bathroom really quick, it can only fire once right? It'll only get me up to around 11 inches... then I can figure out how to stop it." Jake reasoned with himself. Mind made up, he knew the bathroom was only around the corner, and no one would be in there at this time. He just had to make it there. Jake steeled himself, and began running.
Almost immediately, he felt his cock harden and begin to shoot a load into his cum-soaked pants. Not caring, Jake continued to run.
Unfortunately for Jake, Kyle had built in a second clause into the curse which he was not aware of. The longer Jake continued to cum, the longer his cock would grow, on top of the inch gained in the first place. And Kyle had also given Jake's cock the ability to constantly cum as long as it was stimulated. As Jake continued to run, his cock was continually stimulated by the fabric, and continued to non-stop shoot into his pants as he ran.
Jake's cock began to expand in his pants, lengthening and thickening. It had already passed 11 inches and was nearing 12. Jake's balls had also grown by this time. And Jake was only halfway to the restroom! Jake kept running. He just had to round the corner! He felt the tightening in his pants start to become uncomfortable as his now 12 inch cock began to snake down his leg. He didn't dare stop. Jake ran harder, and rounded the corner...
...and crashed right into another student, Dante, who was walking the other way. They both immediately fell down, papers flew everywhere. But Jake's cock didn't stop cumming, and it kept growing. Now at 14 inches long and almost as thick as Jake's arm, it looked almost ridiculous.
Hastily shouting out an apology, Jake tried to get up, and after a little bit of trial and error, succeeded. His groin felt extremely tight and heavy - looking down, Jake saw a huge mass that resembled a long tube. He quickly resumed running (or, more accurately, waddling) towards the restroom. Throwing open the door, he quickly ran inside a stall and threw down his pants to inspect the damage. He gasped at what he saw.
Gone was the fairly average 6 incher that he had started the day with. Jake's cock was now so long and heavy that it couldn't become fully erect anymore, and instead stood out almost straight in front of him. Easily over a foot and a half in length, and the thickness of Jake's arm, it was much bigger than any cock Jake had ever seen in his life. Equally as impressive were Jake's balls - each was the size of a large apple, and when he felt them, they almost seemed to be pulsing. As Jake's cock slowly went soft, it didn't seem to shrink, but instead just hung down, still just as long.