After a few minutes a stall opens and after letting the man inside out, Jake zips inside. Once in he checks his phone again. It still lists his dick size as six inches. Unbuckling his belt, and lowering his pants some, he reaches down under his boxers and begins to stroke his cock. He could feel his erection slowly stirring, but after a moment or so he pauses thinking to himself.
'Six inches isn't really all that different from my regular size, it would be hard to see if it works if I can't tell the difference.' Resting his phone on top of the toilet seat with one hand, he adjusts the erect size to a more impressive nine inches. As he pressed enter his semi-hard erection began to grow and swell. Enthused and aroused at his growth, he jerks more energetically, and soon his dick is at full size.
Nowhere near his former five point four inches, it's obvious that the app has actually worked. "Woah! I'm like, huge!" In awe, he continues jerking, enjoying the feel of his enhanced erection in his hand. Even his stamina is improved, and it takes a couple extra minutes for him to reach climax. His first cum-shot goes wild, splattering against the back wall of the stall. The next is similarly energetic and hits the toilet, some splashing onto his cell-phone. He lets off a few more shots that make it into the bowl before he finally calms down.
Climax complete, he grabs a piece of toilet paper and reaches for his phone to clean it off but it slips out of his hands and falls into the open bowl. Initially disgusted, he reaches in quickly and pull out his phone to look at the screen wondering what happened to the app.